In today's video we show you how we built our "fan" powered tricycle.
Find us on Patreon and our website:
www.patreon.com/techingredients
www.techingredients.com/
In today's video we show you how we built our "fan" powered tricycle.
Find us on Patreon and our website:
www.patreon.com/techingredients
www.techingredients.com/
The "constant acceleration" effect is because the wind entering the front of the fan improves the efficiency of the fan. This will happen until the wind is moving faster than the blades and then wind drag on the blades takes over and then efficiency drops off badly
is this the thing that veritasium and other youtubers was going on about?
@@Famouslastplace Idk. He may have mentioned it in a video. He has done all kinds of propeller based stuff lol. My memory is shitty even though my comprehension and understanding is pretty okay
@@Famouslastplace you are talking of the windmill powered bike, right? That bike is basically exactly the opposite of this one. In this case the propeller can't produce any thrust as soon as the wind speed reaches the speed of the propeller. In veritasium's bike the wind speed needs to be higher than the speed of the propeller/wind turbine, so the wind applies some force to the blades to provide power to the wheels.
@@Henning_S. kzhead.info/sun/rKesl9OEmpGcrYE/bejne.html This is the video. I'm not sure if you are referring to this vehicle as a bike. I'm not knowledgeable in these types of things
@@stupidvids0 If your memory is bad, try getting 9 hours of sleep every night. When I had two full time jobs and not enough time to sleep, my memory went to hell. I've noticed it's better when I get more sleep.
What an intelligent neighbor fella... Already has an engineers mind. Looks like the team might grow. 😁
Tail heavy, high center of gravity, difficult speed control, dangerous...I love it! Hehe Lots of things to improve, gets the creative juices going. This was how the people of old invented and developed things. 'Been a subscriber since the time of the liquid desiccant air conditioner.
more close to Butt heavy 😉
People don't invent things anymore because most states would put you in jail for operating an unlicensed motor vehicle without insurance. Only a mega-corp can do these things legally with the exception of EAA members building light planes. There is no such group for builders of cars or boats so ordinary people don't invent. They go in their apartment and spend their lives watching television like they are supposed to.
Lower frame/seat and fatter wheels
This is basically a Porsche 911
What's the point, though?
Wonderful "toy". Besides having fun designing and building it, you looked like you thoroughly enjoyed yourself taking it up and down the road. And your neighbor also seemed to enjoy it. Can't wait for the next chapter.
Yeah i bet his neighbors really "enjoy" it 😂
@@waffensuperninja they have their leaf blowers and he has his leaf blower.😄
Drop centre of gravity a bit? For better turning performance. Also; people don't think about it often, but Wright brothers were bike mechanics before they started building planes. Big thrust to weight ratio and max efficency has been the name of the game with bikes since forever.
As a Dayton Ohio native it warms my heart to read this. So much manufacturing history in Dayton. It's wild.
I woulda put it on a tadpole trike
Bikes have been space age tech, since forever. E-bikes just makes them even better.
So what you're saying is they should add wings
What about putting some of those monster bike wheels on the rear? I wouldn't want one on the front because at higher speeds it might lift off. And that makes me think about the possibility of ground effects. Of course like you said lower the center of gravity, but it looks like they could widen the stance a bit too. Oh and a Sugar Bear "esk" front end would be sweet.
I found your channel only a few weeks ago, and it's exactly what I needed. Passionate, methodical and understandable demonstrations on an endless variety of topics. I've been binge watching and it's like a college education without all the debt. And as a lifelong bicyclist, finding this video first is amazing. I'm already working a version of my own. Thanks for the inspiration, and I look forward to learning more in the future
John, you’re in for a binging treat! His interests are wide and varied - you’ll learn things you didn’t even know you’d want to learn. The channel is equal parts physics chemistry engineering and fun.
Really appreciate the smooth camera work! I was a full 10 minutes in before I noticed and re-watching it really shows you guys put a ton of effort into it!
Ya, thanks for noticing! The effort the videographer puts in is inversely proportional to how easy it "seems".
@@TechIngredients Always room for improvement in the video department here... keep up the great content! You are definitely an innovator that gets across the finish line. Cheers!
@@TechIngredients you should definitely convert that thing to an ebike as well so you can have dual throttles the ebike part will get you up to speed and then the other part will keep you going... very cool
@@TechIngredients Interesting... I've observed this phenomenon on several occasions with your channel. This is not limited to the video quality either.
Absolutly love it! This is the spirit of the hot rodders, anything can be made faster, louder, more dangerous. Why wouldn't you do it? Can you imagine being his neighbor? Too much fun. It is amazing what can happen when we use our powers for fun instead of serious stuff. Love this guy!
Being safe would also having the rider wear an approved motorcycle helmet! This is a cool idea, but I would install a rear guard on that fan, and lower the center of gravity. Other than that, enjoy!
Yeah we had a name for machines like that we called them (DEATH TRAPS) but it's built for clicks so enjoy the 500 yards it traveled because that's all it will ever do. Always a good idea to have your fuel tank just behind your head. At least when you roll the top heavey trike you Can douse your self with gas and hopefully your on dirt because sparks from a hard surface might give you a new hair style 🤣
i name thee "death on three wheels"
@@e-bikefulltimecitytranspor3552 it needs to allow the non-turning axle to rotate and lean like a trikke or can am
@@Blox117 well it make GOOD evidenced for everyone against small PEV. Maybe next he can DIY a bomb you can ride well he's already done that hope he gets the clicks for building such a stupid machine. Anyone can build a bomb but riding it is a different story. Problem is this trike is as close to unrideable as you can get. And keep ebikes out of this they have nothing to do with a dumbass that puts rockets on sleds. That's not a ebike doubt he can build one as they don't come as a complete machine like the air boat motor and prop you can buy them at the hardware store in Houma LA
@@e-bikefulltimecitytranspor3552 You think a man that builds laser systems and small rocket engines can't deal whit four cables and a modified tire? You should probably actually watch a video before you start raging and flaming about something.
This is great, but why do you have 200 ceiling fans in your garage?
Lolol… my question too!
😁
When I saw Tech ingredients had a new toy, I had to wait until after my toddlers were asleep. I didn't want to be interrupted watching your inspiring show. I'm giddy.
You can fix a lot of the slow acceleration problem by using pedal power to help start. You will rapidly lose the ability to hold cadence as speed ramps up, but at low speeds you should easily double current performance. Also, I don't think your speed is going to be limited by your power. I think you'll find the upper limit of your tire/rim/bearing assembly first. Man, do I love this.
I've known people who got ordinary pedal bikes up to 60mph, you just have to keep steady. The bike can handle it just fine. There are a few places where bikes are allowed on the freeway, and one person was telling me how exhilarating it is to pass freeway traffic at speed, using only the power of your own legs.
@@keithstathem872 Liar.
The theoretical high would be, pitch of the prop x rpm = top speed
I rode a 3-wheeled bicycle when I was a kid. It was really easy to flip in turns. That looks fun, but you gotta be careful.
The USA banned 3 wheelers and allowed 2 wheel dirt bikes or ATV's with 4 wheels. Apparently there were a lot more injuries on 3 wheel ATC's.
Its better and much more stable to have 2 wheels at front .
The tadpole configuration is far more stable when turning than the delta configuration. But because of the way the motor and propeller are positioned, this would make the weight better balanced for this particular project. Although, I do think that the motor and propeller could be mounted on a tadpole configured tricycle, this is just an engineering problem that could be solved. BTW. A three wheeled, human powered vehicle is called a tricycle, never a tree wheeled bicycle.
@@practicalguy973 They didn't ban them so much as companies stopped making them because of lawsuits. You can still find and make street legal trike motorcycles but they aren't very stable which is why back in the early 2000's (maybe the late 90's I forget) they brought back the trike but swapped around and in a street bike format. A lot more stable but not nearly as agile as an actual street bike.
@@lasentinal But it's funny... it makes it sound like a manufacturing defect. Like pants with three legs.
This is awesome. Can you put a short duct around the next fan? It would reduce drag and also create a deflecting barrier if any of the blades failed.
Ducted fan tolerance has to be in the 1000ths to be effective. Most fan blades flex considrably.
I have left more comments on your videos than anyone else. Its because I appreciate so much the work you guys do. Some of it is clearly just for fun, other videos are about science and education, while even still others are about telling people ways to help themselves with relatively easy to make products. This channel is amazing and what you guys do is so appreciated. I love that you guys love what you do and I hope you keep killing it with these!
The center of gravity is a bit high for safe cornering, that's the main issue with this thing. Bicycles (and e-bikes) get around this to some extent by being able to move the centre of gravity by leaning the bike over. Consider changing over to a bicycle frame, it will be a lot more fun. The cornering limit then becomes an issue of traction rather than just falling over due to a high centre of gravity. Traction limits are a bit easier to "creep up on" compared to just falling over due to a high centre of gravity. Motortrikes get around this to some extent by having almost as wide wheel base as a car, but even then they can still throw you at high speed. For this reason motor trike designs are now tending to put the double wheels on the front. This is more expensive as it requires car type CV joints and suspension, however it's much safer as it can't throw you unexpectedly (you'd have to be doing something *really* stupid. Also, you are kind of re-inventing the wheel with the motor part. Powered paragliders (PPG) have had high performance two stroke motors from the start. An 80cc high performance PPG motor like that on the Atom 80 would possibly be cheaper than the 20cc motor you've got there after reworking it for 20 HP. Atom 80 is about 20 HP I believe, at 9500 rpm and will go all day at that speed. To answer the question, yes PPG pilots have been riding bikes, scooters and skateboards with a PPG strapped to their back since forever too. Having a purpose built vehicle would increase the safety of this type of transport. While on the subject of safety I would recommend that you instigate a kill switch of some sort on the motor, similar to what is used on snow mobiles, jetskis, and power boats. The driver (pilot?) has a toggle fastened to them which has bung on the handlebars held in the up position. In the case of a crash or the pilot coming off the vehicle the bung is pulled out of the switch which cuts the motor. Another safety feature build into all PPG motors is a clutch. At idle the propeller does not turn (hardly at all). Only when power is applied does the clutch engage fully. Just my random thoughts on this project... ETA: A really fun variation on this frame would be a modification that that raises the inside wheel when you turn, to lean the trike. The engineering would not be trivial however, since the amount of lean required is dependent on speed. I think I would have a cam that rotates as the speed increases, and use that to control the amount of lean of the trike depending how much the handlebars are turned. So, a double cam system maybe.
Good but long comment, needs more upvotes .. i also was thinking first moment of seeing trike that a double front steer leaning trike would be much safer
He says it's a 224 cc at the start. 6.6 hp according to the website.
Steering geometry is terrible also as someone who has one of these bikes. In a straight line though...
Regarding the clutch, for a DIY solution do you think ripping the clutch out of a chainsaw and re-purposing it here would work?
@@Sembazuru I'm not sure it's the right solution. A chainsaw clutch is high rev high torque, while a PPG clutch just needs to engage at low revs, and it's after the ratio reduction. I guess you could try it and see. I would probably work, but it might not engage exactly when you want it to. I guess it might be possible to alter the clutch (springs and weights) to work the way you want it to.
It would be fun to see this turned into an air-powered railroad speeder. Put it on a DIY flat car, find a heritage RR, and go from there.
We've always wanted to build one. What stopped us was the paucity of unused or abandoned tracks in the area.
@@TechIngredients Who said anything about the tracks being unused? LOL.
Definitely needs a brake upgrade before any high speed runs. Bicycle brakes are nowhere near up to the task at the speeds that thing can achieve.
Yes. Improved braking would be needed
downhill mountain bikes seem to do just fine
My inner child is standing up and cheering. The current airline pilot I became is doing the same. This is the type of thing I want be doing with my free time, but between work and having a 5-year old, there's precious little of that at this time of my life. Not that I'm complaining one bit about it.
I'm glad you let the neighbor try it. Very fun to watch.
That turn tip phenomenon is why they quit making those 3 wheel off roaders and went to 4 wheelers. YUP, All it needs now is a flux capacitor.
Oh for sure! I grew up with the huge Honda three wheeler.... it was fully Deadly. But RAD
@@dannixon247 those things are actually illegal in my state now days. Not sure about the rest of the country, but I'd guess most states probably banned them by now.
@@BEdmonson85 yeah well I'm in Australia so anything goes..... But, that said, I prolly wouldn't let my son's ride em...😏
I was always surprised they stopped making them for such a silly reason. Lots of things are inherently dangerous but they still make them. I've ridden on 3-wheelers and didn't have any problems because I know how to adapt to what I'm riding and how to shift my weight. It's even fun to ride them on two wheels intentionally tipping it so you do so. I mean think about it, people used to race them. It was only the casual rider who should have likely never had one that ruined it for everyone. I'd still love to have one in addition to my 4-wheeler.
but 4 wheelers are all trash
there's a reason motorcycles have the engine under the rider and centered. Weight distribution is a big factor in stability and handling.
people who have never built a custom bike or really ridden any bike for an extended period don't grasp the fact that even the speed the motor is turning can effect the way a bike is moving.
The neighbor was great he was so interested you definitely inspired him!
Thank you for that. Proof of concept is just what I needed.
Mr. Tech Ingredients, ive always wanted to see you make a rotary subwoofer. Do you think you would have interest in such a project? Thanks!
I like this idea
Seconded!
Yes! I'd love to see builds and comparisons for a rotary vane sub, a servo driven sub, and perhaps something really odd, like a high-volume fan in an h-bridge-like duct system. A ridiculously-sized bass horn would be fun too.
You absolute madman. I love it. Thanks for building it!
Wonderful - I can see you having so much fun. Happy Trails indeed to you and yours
every video is a step up and forward. Real practical genius.
Cool! That thing looks all kinds of dangerous! I love this channel.
Had a buddy do this with an electric motor and 36 volt DeWalt batteries about 15 years ago. Used a two wheeled recument. A Lightning P38 I think.
On this topic, I'd strongly recomend researching or trying an EUC, they are way more capable than E-bikes, E-motorcycles, and other things. They are insanely compact, efficient, and way more capable than a huge range of things. For example the Begode Master Pro can be ridden at 55 mph stably and has a 125 miles range (200 km) at standard speeds (base model tesla has a 272 mi range so 46% / 2.18x the range for comparison) via a 4800 Wh battery (most efficient vehicle I know of). And because of its truely tiny size it can easily be taken with you on public transit, inside your car, inside a store, or within a crowd. There is a ton ton ton more benefits. Your hands are fully hands free so you are able to do anything you can do while standing or sitting, just while standing or sitting on the EUC. It's effectively "powered walking" and "powered sitting" from the slowness of a walking pace up to 55 mph with a range of 125 miles, turning radius of 1 foot (or 0 feet depending on how you turn). And if you want to stop and stand stationary you just step off, click the handle up, and it is a power-assisted suitcase that will follow you and can carry stuff. And if you come across stairs you can't go around, it can ride up or down them. Or if you need to be more delicate you can get off and have it along side you as a suitcase and it will climb up or down the stairs itself. To get your mind around it, it's self balencing like a segway but has only 1 wheel, a seat, and no handle. The wheel goes between your legs and there is a spot for your foot on either side. You have to balence left and right just like a bike (forward and backward are handled for you by the self balencing), so it's as difficult to learn as a bike. Just like a bike you balence by slightly turning left and right. The same applies on an EUC, but steering is handled by shifting your body weight left or right. This does mean that if you already know how to ride a bike none of that skill will transfer over since it is steered differently. It typically takes people a week to learn practicing every day.
I had built something very similar about 15 years ago, it was a wind sled for on ice and snow, I made the propeller myself, I built the vehicle with rudder pedals. The soul purpose of the vehicle was for me to get accustom to useing but feet for yaw control in a ultralight airplane I had purchased that was a tail dragger airplane with foot controled rudder just like a regular airplane, and it was perfect for that " it was a simulator" for flying a airplane, and I did get good at useing my feet and was successful in teaching myself how to fly a airplane " and my wind sled is the reason for such success" the vehicle became a very fun vehicle for anybody to drive. The skis were cambered so they wouldn't catch if you were turning abruptly. It was incredibly fast ' it had conventional steering as well, so you could use the two forms of steering opposite of each other to drift or to prevent spin outs. Tons of fun" I have a pic , not sure if I can send a pic?
Makes sense for it to have a slow start and then keep going as the thing speeds up - the propulsive efficiency raises as the vehicle speed approaches the exhaust speed (prop exhaust in your case). Am on holiday reading 'Aerodynamics for naval aviators', was on the page by coincidence
Very cool young man. He was hyped to get to ride it. You could tell.
So awesome! That was nice to let that kid test ride it. So chill
Really nice build you got going. I'm into RC planes (race drone included), and the thing i found out after testing is, the steeper the angle, the quicker the acceleration. If you want to go faster, you need more RPM. Bigger propeller also helps with efficiency. Thats why if you look into long-range drones (long fly times), 7-9" is what is best, instead of the 5" most people fly.
As it is a "constant force" device, (more or less), the faster it goes, the more power it outputs.. (which is why the "keeps on going" feeling, I suppose)..
keeps accelerating until the thrust force equals the drag force.
बरोबर बोललास.
@@dariusmccormack7793 feathering is a different thing, it's the ability to align the propeller blades with the airflow to lower the drag of an engine that isn't turning. You're thinking variable pitch.
And the more resistance it's going to push against... Upper limit is going to be near terminal velocity at atmo pressure i think... Which is about 60 times faster than I'd be wanting to travel on a bike.
Lookup Terminal Velocity and Prop Slip, they play a critical part in this equation.
So what's up with all the ceiling fans in the warehouse you got there? What kinda crazy fun are you planning with those?
Ha ha ha, yes! I was going to ask the same question!
Fans? What fans. Nothing to see here. Move along, move along.
You made my day when you let that young man take it for a spin.God bless you always, and forever.
Your videos remind me of when I and my friends were 17. When we meet nowadays (45 years later) we of course still talk about these wonderful, dangerous, and crazy times! 😎
Cars and Cameras builds some wild stuff like this. Very much worth checking out.
Amazing how flexible you are at attempting multiple projects that require diverse general knowledge, scientific, and engineering skills. If you paint, and work sculpture too, you are a true Da Vinci Renaissance man of the 21rst century. .
Most of the things he does aren’t very complicated, especially this fan tricycle...
So kind of you to let that young man try it out. Seems like a cool kid. Nice vehicle.
I hadn't ever seen anybody do that except in a cartoon. I'm so glad that I lived to see somebody make this happen in real life and that it is as weird and as amazing as it sounds and always looked in the cartoons. Great sounds. Look forward to all the engineering geekery around this bike.
A collaboration with Jimbo from the Robot Cantina channel would be cool. He really knows how to get those little motors to produce power!
I would love to see you make a souped up Ebike and see what your local semipro mountain biker could do with it
When I used to fly ultralights, this was the same principle minus the wing....A few times I "drove" my ultralight around the flying field, but had no braking except dragging my feet and reducing the throttle...good ole days :)....great video
The level of execution in your works is just to love!!
I'd love to do a clutch drive (centrifugal, belt, or traditional) on a recumbant. All the fun of a motorized bike but no balance issues and comfortable (and a much bigger motor with lots of torque) Either 4 stroke like this or a big 80-100cc two smoke chainsaw motor.
I actually had the idea to convert a pair of motorcycles, probably dirtbikes, into a recumbent bike, basically take the front fork off and use the mount to secure the rest to a frame. So you'd have two fully independent drivetrains powering the rear wheels. There a million and one issues with that, not the least of which being visibility and heat with the driver between the two motors, but it would be stupid fun. LOL
@@Nevir202 Aw man.. the differential steering if you lost a motor! That would be absolutely nuts
@@mattfleming86 lol, ya, but at least you could still drive.
no it needs to be electric instead of antiques
It´s a nice gesture to let the dude drive your monster machine :)
This looked like so much fun!
In part two be sure to provide vehicle weight and consider testing the overall thrust output of the unit. 👍
And add a parafoil lol. Looks like it has enough thrust to fly.
@@linuxgeex I've been looking at this engine for an ultralight I'm designing. Currently live in an apartment so this kind of project is out of the question, but raw data would be excellent to have for theoretical calculations.
It’s a paramotor trike, lol. All you need now is a wing! Look up Tucker Gott on KZhead, he has one.
I've got to say, I appreciate the editing, it adds just a little bit of spice to an already good thing.
Thank you for all your good willing and point of view! A really good youtube chanel!
Great video, loved the neighbours! Do you need to add a cover over the back part of the fan cage so it it's completely enclosed? I wonder what mpg this thing gets? Loved the cuts to Rod Taylor in The Time Machine, this was one of my favourite films when I was younger.
A chain would be more efficient by far. This machine is most efficient at max speed only. The same engine with a CVT would use much less fuel in a stop and go application.
@@kevinsellsit5584 And of course you can get obscenely cheap so-called torque converters online and tune the clutch springs for purpose and engine output.
@@kevinsellsit5584 CVTs are horribly inefficient currently. It would also have to be computer controlled to match the ratio to the power output. Anything between the driver and the driven reduces efficiency. For example, a car's peak fuel efficiency will be achieved with a 1:1 engine:transmission ratio with the engine rpm at peak torque.
Very cool! In the next episode: we have added these two - easy to fabricate - wings and we have a Fokker D.VII like replica that is not road legal but you can drive it a couple of hundred meters until it gets airborne. 😅
That was cool of you showing your neighbour! Looks like he had a lot of fun! Seems like a smart kid.
Thanks. I seem to be surrounded by them.🙂
That camera pan with the bike turn at 8:45 was beautiful. I love it when curious people show up to check out cool projects!
So do we!
This is awesome! BTW I have full notifications on for your channel and this is the first video I have got a notification for in about 8 months fyi. As always love the channel and can't wait to see one of the jet engines on here or even a turbo fan ;)
Thanks!
@TechIngredients Just what exactly is the formula for converting Geekpower to torque? 😄 You were having such a good time on your contraption there, I wish I was your neighbor!
"I wish I was your neighbor!"- True
Great to see the inner child come out in an older person and that youngster will have a story to tell his grandchildren.
I am so happy I found this channel. It's so much fun I love it
Another reason why loud motorized vehicles get a lot of looks: When something suddenly screams at you it triggers a bit of a fight or flight reflex and it makes you watch for potential atackers. (Try to not look at a loud motorcycle for example, it will take more willpower than you think). Not everyone who looks, likes it. I still like your projects a lot and appreciate the videos!
It looks "crash-able". I'd want full leathers, helmet and gloves for the velocity test. You should be able to approximate it if you know the inch pitch of the props as it should eventually get to 90+% of that pitch X RPM ... depending on frontal mass, rolling friction etc. Fast enough for leathers!
I don't think you will get 90+% efficient
@@D2O2 90% of prop pitch to actual speed given enough time ... but yeah, 90% is high. Efficiency of fuel burn to vehicle distance would be around 10% best case.
I would also add a stronger rim to the fan screen. If something happens and the fan hits the ground, you don't want the propeller shards flying all over the place.
@@MikkelHojbak like a nice duct.
After having low-sided a bike on gravel at 15mph... yeah. Get some leathers.
Thanks for producing this. Looking forward to the video where you increase the power the engine produces.
That was funny. The way you look driving it is priceless.
Great idea, what would I change: Suspension, disc brakes, better wheels, helmet ;) You may like to check Bowhead bikes.
This is going to be so cool! How much fun is a rocket bike?!? Dude! Helmut! Your brain is valuable!😜
i dont need no helmet! my body wont break! err.... ok maybe my right hand is a little battered up but xrays said it wasnt broken! i really should start wearing 1
NH remember, live free or die!
Lots of fun. I hope you continue the series. But please add onboard storage for a helmet, goggles and heavy gloves.
I always enjoy your builds! I’m guessing there is no coincidence that your recent jet engine builds came first. I’m ready to see a jet powered tricycle 😅😁💜
I would wager a bet that the prop would be more efficient at a higher rpm than the engine can produce. The new Predator 224 does share parts with the 212. A new aluminum rod and lightweight flywheel allows you to spin these things up to ~7500 rpm(after removing the governor).Toss in a cam designed high rpm power and you’ll have a real monster on your hands. Of course, just putting a centrifugal clutch and chain driving the bike would be more efficient. It’s nowhere near as cool though!
Spin the prop too fast & the blade tips go supersonic - a land of possible blade damage & lots of unbelievable noise.
@@loddude5706 Theres no way a ~7 hp engine can spin a prop that size past the transonic wave drag regime. I would be surprised if you could exceed critical mach number lol.
@@brandonb6164 supersonic has nothing to do with size of engine. Tip speed is a critical part of propeller design, . What your saying is backwards. Most airplane engines if geared have the engine running much faster then the props. My experience says that size prop is good for about 3500 rpm. The engine can do twice that. Otherwise you get noise drag and prop failure.
@@brandonb6164 - OK, given effective zero pitch, what RPM would a 30" prop need?
@@jbird6609 the power required to spin a prop of a given shape increases proportionally to the square of the tip velocity, which itself is proportional to the diameter. That means as you increase the propeller diameter the power required to spin it at a given speed increases massively. Furthermore, as you begin to have compressible external flows around M0.7 the drag coefficient increases enormously. Engine power is directly related to how fast a propeller can be spun. That’s because the propeller does work on the air, and the amount of work that can be done in a given amount of time is limited by the engine power.
Bikes impressive but what the young man had to say about the nitrogen and the safe weed killer was even more impressive 👍
Do you know what they’re doing? Must be somewhere in New Hampshire.
How cool! 👍 I imagine you could measure the speed of the wind coming off the prop and get a close estimate to how fast it would go, probably minus a bit due to wind drag and friction.
Another commenter mentioned redesigning this into a bicycle, and I strongly agree. The stability of a bicycle will be a huge benefit to the potential speeds you could get with your upgraded 20-25 HP motor, cornering will be a lot safer and faster that way. As always, I love the work put into these videos, as it stands this project is extremely cool and while not entirely unique, it's unique enough to merit my rapt attention, and I'm looking forward to phase two.
Yeah, thrust acts as a force, and as F=ma, a=F/m, force is (relatively) constant, mass is constant, acceleration is constant. Gets faster and faster. Good observation. This channel is an absolute trove.
its no different than a wheel. acceleration is not constant due to air resistance.
"Stay safe. Happy trails. Watch this minor on this really fast bike without a helmet." I don't get it, you're otherwise always very safety-minded. Why not here?
How fast do you think he was going? Since he was working he might as well be 18 for all we know.
I live in Dayton Ohio home of the Wright Brothers. I can see the museums they started out in and their workshop that built the first plane and there is a prototype on display. This reminds me of the idea they had.
this is awesome! And it is really fast. I could see myself riding this "time machine" to work xD
This is somewhat odd and also fairly amusing, very retro for your channel. But since it is your channel, I am still looking forward to all the stuff I can learn from the process! Apropos of nothing and only because I am here right now - some other channel recently mentioned the high environmental cost of carbon fibre and that hemp or flax can be used. For a future project, that might be of interest for your channel? Whatever comes next, it will be good!
You guys should wear a helmet, just in case, especially when letting other testing it. A wider wheelbase or something like a go-kart chassis would make it safer. Also they said -Don´t stand behind it! Not very practical on public roads.
Quiet down, you.
@@amandahugankiss4110 English´s not your thing, right!
That it?
I wish i had a neighbor like you.
This looks freaking fun!
WARNING about using a setup like this. I showed this video to a lifelong friend who was a bicycle shop owner for many years. He pointed out that this type of setup is nothing new and that in fact it is rather dangerous. Don’t jump to to a quick conclusion and stop reading this thinking that I am going to start into how dangerous a spinning blade is to have behind you. Well it is but for the most part only after you crash. The problem is where the thrust is coming from as it is pushing you at a point where it has leverage above the centerline of the weight distribution of this three wheeled bicycle. If you have ever ridden a 3 wheel ATV or a 3 wheel bicycle like this you would understand how easy it is to pick up the inside rear wheel on a turn. Now add a pushing thrust point that has leverage above the center of gravity and you have a major face-plant device where a accident is just around the next corner. So you are cornering under power, the inside rear tire lifts up , at the point you realize you are in trouble you lift off the throttle and thats too late as you are already being powered into the ground as the fan behind you does not instantly stop. So you hit the ground followed by the fan and fan shroud that will collapse in against the fan blades sending carbon fiber shards all over the place. Not good. The way a 3 wheeler with your two drive wheels behind you is why 3 wheel ATVs were outlawed. The way they roll over, and it is easy to do, makes for a really bad crash. Its why the new breed of street 3 wheelers have the two wheels in the front for stability. Yes you can still roll one of those but they are not as easy to roll as the 2 wheels being behind you. Being the owner of a recumbent style bicycle I have one other warning to pass along about the propeller engine machine. Sitting down and back on a 2 wheeled bicycle you need to keep in mind that most if the weight is on the rear tire and its a lot easier than it is on a upright bicycle to lock up or skid out on the front tire and crash. On the three wheeled propeller driven bike the engine is mounted back by or even slightly behind the rear axle this adds to the problem of the traction you are getting on your front tire. This leads to a problem of understeer known in racing as a “push” in a turn and the reaction ti this happening is for the rider to turn even more into the turn and that simply compounds the problem of the front wheel that has already lost traction. Then when that overly steered front tire catches traction, over you go. Overall this is a really dangerous design that should NOT be tried. Electric power would be a much better idea with the weight of a hub drive being on the front and the batteries being mounted below the center of gravity and forward of the rider.
Every party needs a pooper. Boooooooo!!!
@@McSpliff83 You will figure it out for yourself when your head hits the ground.
Don't forget a brain bucket!
As always, I love what you're doing. Stay grounded in science and you can't go wrong :-) All the best.
I guess the next obvious iteration would be a paraglider wing. Your flying car. Oh yeah, an underway chute deployment apparatus. A great James Bond seen, a car chase where you drive off a cliff, pull the chute and fly away. 😁
for gods sake man, put on a damn helmet!!!
now thats a mode of transportation worthy of an excentric inventor well done!!
Thanks for another great video! Measure the thrust! That's barely taxi power. You could get a lot of good ideas and safety tips from us paramotor pilots. Not unusual to have the fuel tank right behind your head on a paramotor. Make sure you stress the importance of making sure the throttle isn't stuck open when the engine is started. Even with that cage the most dangerous place for bystanders is perpendicular to the plane of the propeller. I had a propeller explode one time. Fragments were found 30+ feet away on each side (it was at full power on launch). Also I don't think that prop is matched well to that engine. I suspect that engine could put out a lot more power but is limited by the prop. My paramotor engine is a Vittorazi Moster 185cc single cylinder 2-stroke that produces 25 Hp @8500 RPM with a reduction drive of 1:2.87 swinging a 2 blade 130cm prop. Puts out 175# of thrust, strapped to my back. The draw back is it's not as reliable as a 4-stroke and needs frequent maintenance and rebuilds of the top end every 100 hours and bottom end every 150 hours. 🙂 Also, HELMETS!?!?! kzhead.info/sun/l5R9ia2ha4CFeok/bejne.html
Thanks for the feedback. We did measure the thrust @ 32# at 4,000RPM, direct. That's maximum for both the propeller and engine, so they're well matched. Not bad for that diameter and 5.5 HP.
Nice power slide around the corner at the end. I could almost hear the adrenaline in your voice
Idk why it took me so long to make this connection but you are the Jordan Schlansky of science lmao 🤣 and I love it
So Tech Iingredients is doing Wile E. Coyote stuff now!? 😂
I already have a trike similar to that so I'm definitely gonna stay tuned.
How fast is super fast .I hit 50 mph on my lil 85 cc two stroke engine..that's a sweet bike build bro 👍 keep it up
Insane ! You always bring a smile to my face; I wanna be your neighbor. If the Wright bros. had invented this (I’m told they were pretty good bike mechanics), they probably wouldn’t have bothered with a flying machine. So generous and enthusiastic - I thought, “Maybe he’ll let the kid take it for a spin... nah..” And then you did! Greetings to you and your son.
Thanks!
pretty cool , i made an electric one its on my channel.. mine was a regular bike , I never exceeded 31 mph because the bike was low quality walmart, and the brakes were iffy. What i found over the few months experimenting is that a bigger prop is always better for off the line acceleration , but 30 inches with 4 blades seems to work quite well. Nice work!
Thanks!
looks comfy, Good to see kid having interest
This thing is AWESOME. I wanna build one myself. SO COOL!
I did a similar, but electric fan in an even more streamlined recumbent bicycle, (not a trike) for an event at the Portland International Raceway in OR some years ago. Independently driven with lithium iron phosphate batteries. Instead of an industrial fan cage I used a home brew plastic garden planter rim that served as a ducted fan shroud. Still finger dangerous at the output side as yours is, but able to perform well because my aerodynamics were better. I was on a modified Lightning Cycle Dynamics F-40 that I had traveled coast to coast with back in 2000 at the age of 57 without that fan. PIR has had an event on Memorial Day where their contract with Portland requires silence of the ICE race cars once a year, giving the track over to Fast bicycles like mine, and the electrathon racers following that sport's Australian rules. We alternated races for that day. My bicycle with that fan did not fit either set of rules, so I just did demonstrations with the fan and raced strictly with the pedals for our IHPVA rules events. I could go at 20 miles per hour all day back then, on that flat course without the fan, but with it I was cruising at 30 plus mph. Obviously I was limited by the batteries, but I could have competed fairly well against the three wheeled, streamlined electrathon racers who at that time had to use only lead acid batteries, and no pedaling. The fan alone would drive me at 15 mph.