500 mph Bicycle

[Spotty]

Just now, dalekphalm said:

And yes, to even get to that speed, it has to be draft assisted. But it's still incredible skill to get that fast even with assistance. And the danger is insanely high, because they've got a... what, 1.5m gap of air to work within.

At what point is a bicycle not a bicycle...

Spoiler

I'm actually curious now what the speed record for unassisted cycling is...

Quote

Flat surface, unassisted – Male record for regular cycling without pace car is held by Sebastiaan Bowier with the speed of 133.75 km/h in 2013. Female record is held by Barbara Buatois with 121.81 km/h in 2010.

Semi-related but I actually watched a youtube video the other day talking about the 1 hour bicycle speed record and how challenging it is. Basically the challenge is to ride the bicycle for an hour and cover as much distance as possible in that hour. The record sits at around 55km/h (35mph). That's more of an endurance event and not a straight high speed sprint.

[dalekphalm]

Just now, Spotty said:

At what point is a bicycle not a bicycle...

  Reveal hidden contents

Well to be fair, most of what you see isn't the bike. That's the drag car. The bike still looks mostly like a regular bike. The main differences are the super stable frame, the insanely high single speed gear (which pretty much doesn't work below like 50 MPH), and the motorcycle grade tires.

 

Just now, Spotty said:

I'm actually curious now what the speed record for unassisted cycling is...

Semi-related but I actually watched a youtube video the other day talking about the 1 hour bicycle speed record and how challenging it is. Basically the challenge is to ride the bicycle for an hour and cover as much distance as possible in that hour. The record sits at around 55km/h (35mph). That's more of an endurance event and not a straight high speed sprint.

55 km/h is still damn impressive though.

[Canada EH]

2 hours ago, dalekphalm said:

to even get to that speed, it has to be draft assisted.

Yeah I think I know the one you speak of, I remember something about a women, bicycling really fast with the help of draft assistance on the salt flats. I am sure they get an adrenaline rush from it.

 

Well before biking ski mountains became popular and you could take the lift up, I rode down Paskapoo now renamed and a few other ski resorts in the Rocky Mountains this would have been 30+ years ago now. It was quite fun, much skill. I watch a few YT's on dumb fucks buying BSO's from Walmart and taking them to Whistler/Blackcomb and those bikes never survive. The dipshit even returned it and got a refund, selfish motherfucker. I have gone up to 60kph but on juice, no pedaling at all. Not the juice Lance was on either, talking electron juice Also I did not even do 60 for too long and I just assume that speed because that is what the speed limit was and I was right behind a SUV. I did not feel safe going that speed because one pothole and its not good, one rock, one 2x4, one nail, one bump. 60mph is 100kph and on a bicycle, bicycles were not meant for those speeds, those vibrations, those forces. It would not even be worth it to reinforce the welds, be better to just buy a motorcycle frame, and install the bicycle driving components. Using those cranks would require lots of space, a gear box would work. A nicely machined gear box, then you could even install an overdrive unit that can slip in once you get to certain speeds. Some vehicles have aftermarket overdrive units, they are quite costly.

[Guest]

13 hours ago, BuckGup said:

Right but you would need solid metal wheels otherwise they are going to not withstand the speed or you would get insane speed wobbles. The land speed record on a pedal bike is 

https://www.velonews.com/2016/09/news/ca-woman-rides-her-bicycle-147-mph-a-new-world-record_420507

Crafting wheels out of Formula 1 carbon fibre, for all bearing 200,000 RPM hybrid silicon nitride bearings purchase from a specialize company frictionless bearings skateboard riders use bones ceramic bearings has a spin time of 5mins before coming to complete stop, with fidget spinners they use ceramic silicon nitride bearings those things keep on spinning for long time.

[Guest]

Maybe when i finish building my pc and install UE4, i might come up with on well usually can purchase a Tour de France cycling game, i might be able to come up with a self sustaining human powered 500 mph supercharged bicycle, at lease i wont waist money.

[PlayStation 2]

Wait until some dumbass in an Escalade does some brake checking.

[Noctus]

1 hour ago, James Aplin said:

i might be able to come up with a self sustaining human powered 500 mph supercharged bicycle, at lease i wont waist money.

The fact you think this is feasible (or safe), at your age, is down right embarrassing.

[FloRolf]

A 27" wheel at 500mph would spin at roughly 6000rpm and so would that tiny gear connected to the chain. The thing will fall apart very quickly if it's build like a regular bike, "just faster". 

 

You should instead of a chain look for something like a planetary gearbox connected directly to the pedals and also somewhat differently connected to the wheel. Also a different wheel altogether. 

 

There's a few videos on YouTube where people build something like this with Lego and a Lego wheel. The thing falls apart in the end and the weak axles can't hold up with neither the speed nor the heat produced. 

[GoldenLag]

3 hours ago, James Aplin said:

Crafting wheels out of Formula 1 carbon fibre, for all bearing 200,000 RPM hybrid silicon nitride bearings purchase from a specialize company frictionless bearings skateboard riders use bones ceramic bearings has a spin time of 5mins before coming to complete stop, with fidget spinners they use ceramic silicon nitride bearings those things keep on spinning for long time.

You do realize that the wheels on say the Bugatti Veuron SS or Koenigsegg one dont fair well at post 250 MPH.

 

The issue isnt the wheel bairings. Its all the other bits including drag. 

 

Also, carbon fiber os about the last thing youd wannt to make a wheel out of when you cant use Rubber to withstand the friction or slight bumps that would crach the wheel. 

 

The simple fact is that you cant output enough power to maintain or reach close to that speed. 

 

I mean early jets struggled to reach 500mph under their own power. And a lot of them didnt. First one being the dehavillan Vampire iirc or the Me 262. 

Edited January 18, 2019 by GoldenLag

[Guest]

12 hours ago, Kallahan11 said:

Depends on the bike, a road bike in a fast but casual group ride sits arounds 18-20mph, the Tour De France riders average 25-28mph for the whole 21 stage tour, with the hill climbs averaging 21-25mph except for the steepest parts. I've personally hit 38.42mph on a downhill, which was scary but not uncontrollable.

 

note that the difference between a good casual cyclist who does a few races here and there and rides with a group every week and a pro who puts in 20km's a year is only 5-10mph.

I've done about 35mph on my wee mountain bike, surely a road bike can get a bit more?

[Guest]

2 hours ago, FloRolf said:

A 27" wheel at 500mph would spin at roughly 6000rpm and so would that tiny gear connected to the chain. The thing will fall apart very quickly if it's build like a regular bike, "just faster". 

 

You should instead of a chain look for something like a planetary gearbox connected directly to the pedals and also somewhat differently connected to the wheel. Also a different wheel altogether. 

 

There's a few videos on YouTube where people build something like this with Lego and a Lego wheel. The thing falls apart in the end and the weak axles can't hold up with neither the speed nor the heat produced. 

Yes i have come up with that idea, you know that photo of that gold and silver gearbox that is a 50 to 1 that long shaft sticking out that is the slow in the other end is the fast out, i turn the slow in the fast out does 50 time its only 7nm of tork and 14 nm of excelerated tork stick that in the rear wheel like a nexus hub, then i just only need to use a Duace group set, so i could have gear changes from 1 to 50 up to 1 to 200 ratio.

[RuffRuffmcgruff]

Don't listen to the haters OP, you do you. Go for it, you god damn renegade.

[GoldenLag]

5 minutes ago, James Aplin said:

Yes i have come up with that idea, you know that photo of that gold and silver gearbox that is a 50 to 1 that long shaft sticking out that is the slow in the other end is the fast out, i turn the slow in the fast out does 50 time its only 7nm of tork and 14 nm of excelerated tork stick that in the rear wheel like a nexus hub, then i just only need to use a Duace group set, so i could have gear changes from 1 to 50 up to 1 to 200 ratio.

how exactly does the gear change allow you to go faster? it doesnt change the very high limitation of power throughput. 

 

i dont like to be the person to shoot down dreams, but to go at 500mph and ground level while touching the ground you need Mig 15 without its wings.......  simple pedaling wont do the trick

[Guest]

8 hours ago, dalekphalm said:

Yep. I found the updated info on the Wired YouTube video posted above.

 

And yes, to even get to that speed, it has to be draft assisted. But it's still incredible skill to get that fast even with assistance. And the danger is insanely high, because they've got a... what, 1.5m gap of air to work within.

If she falls back too far, it's like hitting a tidal wave of water.

 

I sure as hell wouldn't try it

No what i have come up with that i don't even need that shield in front, that is why i came up with a centrifugal supercharger using the compressed air to help drive the wheel using a fixed wheel turbine smaller then the diameter of the rear wheel so the air coming out of the compressor travels through a single taped manifold short piper to the inlet of the turbine housing pushing against the vains fixed to the rear wheel so airpressure forces wheel spin vains inside turbine housing has windage for free spin the turbine housing looks similar to the compressor with inlet and oulet so airpressure passes through, the vains inside turbine housing in flat slightly concave not on angle like the compressor the turbine vains is similar to those pelton water thinking don't know if seen 40 vains.

[FloRolf]

20 minutes ago, James Aplin said:

Yes i have come up with that idea, you know that photo of that gold and silver gearbox that is a 50 to 1 that long shaft sticking out that is the slow in the other end is the fast out, i turn the slow in the fast out does 50 time its only 7nm of tork and 14 nm of excelerated tork stick that in the rear wheel like a nexus hub, then i just only need to use a Duace group set, so i could have gear changes from 1 to 50 up to 1 to 200 ratio.

I'd say you can easily calculate what torque you'd need roughly, by Cw value and friction of the tires. I don't think you'll come far with 7Nm which are without the other transmission, are they? 

[GoldenLag]

5 minutes ago, James Aplin said:

No what i have come up with that i don't even need that shield in front, that is why i came up with a centrifugal supercharger using the compressed air to help drive the wheel using a fixed wheel turbine smaller then the diameter of the rear wheel so the air coming out of the compressor travels through a single taped manifold short piper to the inlet of the turbine housing pushing against the vains fixed to the rear wheel so airpressure forces wheel spin vains inside turbine housing has windage for free spin the turbine housing looks similar to the compressor with inlet and oulet so airpressure passes through, the vains inside turbine housing in flat slightly concave not on angle like the compressor the turbine vains is similar to those pelton water thinking don't know if seen 40 vains.

and you plan on doing that without combustion?

 

you know any type of intake creates drag right?

 

the gaping intake hole will just create drag. the reasons airplanes use them for their jet engines is because the engines can take in the air and create thrust using combustion. 

 

just having the massive intake wont do much as the power that allows the turbine to spin at all is from drag that is created by speed that you yourself has to input. if you could input air and have a net gain in momentum you would have an infinity machine. a machine capable of creating infinite power. Also known as a perpetual motion machine. sadly there is no such thing. 

[Guest]

When i first came up with these kinds of idea 10 years ago i did think of one can go 100 X the speed of Light, so i didn't worry about that one anymore as the Earth could not contain me of that kinds of velocity i be spat on into space travelling at 30 million kms, and the bike would look silly, also i not doing 500 mph bicycle as well, i thought id share something another reason is i tryed to go to machine shops to craft me two 120 tooth sprockets and two 12 tooth sprocket they wouldn't do it as well if they did it would weigh a tone, stuff that also the shear weight of the chains.  For something i come up with sure a great idea if want to travel from Adelaide to Darwin in 5 hrs, be cheaper to build a $36,048 workstation.  Another thing if hit a tree because miss the corner end up collision with a tree also kangaroos hoping out of know where and Huston we have a problem at the time i thought it would be a good idea, to much head_****

[RuffRuffmcgruff]

2 hours ago, James Aplin said:

When i first came up with these kinds of idea 10 years ago i did think of one can go 100 X the speed of Light, so i didn't worry about that one anymore as the Earth could not contain me of that kinds of velocity i be spat on into space travelling at 30 million kms, and the bike would look silly, also i not doing 500 mph bicycle as well, i thought id share something another reason is i tryed to go to machine shops to craft me two 120 tooth sprockets and two 12 tooth sprocket they wouldn't do it as well if they did it would weigh a tone, stuff that also the shear weight of the chains.  For something i come up with sure a great idea if want to travel from Adelaide to Darwin in 5 hrs, be cheaper to build a $36,048 workstation.  Another thing if hit a tree because miss the corner end up collision with a tree also kangaroos hoping out of know where and Huston we have a problem at the time i thought it would be a good idea, to much head_****

After reading this i've unlocked the inner machinations of the multiverse and have become ascended to a god like being.

[BuckGup]

10 hours ago, James Aplin said:

Crafting wheels out of Formula 1 carbon fibre, for all bearing 200,000 RPM hybrid silicon nitride bearings purchase from a specialize company frictionless bearings skateboard riders use bones ceramic bearings has a spin time of 5mins before coming to complete stop, with fidget spinners they use ceramic silicon nitride bearings those things keep on spinning for long time.

Carbon fiber would not work. You need solid nickel wheels and bones skateboard bears would explode

[Blasteque]

I had re-read the first post many times to get this, but it appears the wheel is driven by pedal power and the supercharger is driven by the wheel.  The supercharger then provides assistance.  According to your first post you're trying to get 22psi out of the supercharger.  The manufacturer should be able to provide you with the power and rpm necessary to drive it to 22psi.  One of the biggest disadvantages of superchargers for cars is how much of power parasite they are.  I would guess that 22psi is going to require way more than a human can put out.

 

That's not really the big worry though, because the supercharger is not a positive gain in the system. It will cost you power; it must.  If it didn't it would be perpetual motion machine.