Each time you increase the gear ratio you increase the amount of torque required to move the load. This is why when you run say 32/32 on a std bike it is easier to pedal than 32/11 which in turn is easier than 52/11. Sure you can design on paper a set of gears to give incredible speed but you need incredible torque on the input to match it. And that is without even considering drag as previously mentioned.
dream super bike
- Thread starter Licramite
- Start date
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StuAff
Silencing his legs regularly
- Location
- Portsmouth
And the Veyron Super Sport needs another 200 bhp on the standard version to increase the top speed to 267 mph (if you had the limiter off!). 20% increase in power only giving a six percent increase in top speed.
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
OP has neglected he needs the legs to maintain speed. He's best off going out and buying a Shiv and seeing if he can maintain 30 mph. I know a man who can - Hutchinson - current 10/25 TT Champ !
Drag upto about 17 mph on a calm day is negligable, but over that it takes double the power output to go just a few MPH faster - think about it.
Who is going to ride this bike - The Hulk !
75m gear 
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Kestevan
Last of the Summer Winos
- Location
- Holmfirth.
Hmmmm, you could probably hook up some sort of petrol engine to provide the required power (cos I doubt your legs are going to be able to drive it)
Perhaps you could then call it an "engine bike" or something similar.........
Perhaps you could then call it an "engine bike" or something similar.........
Zakalwe
Well-Known Member
- Location
- Barnsbury, London
I've just designed a bike that can do 500mph, it's got a 350t chainring and a 10t cog.
Mine's better than yours.
Mine's better than yours.
Andrew_Culture
Internet Marketing bod
- Location
- The People's Republic Of Suffolk.
Dammit, you beat me to it!
Andrew_Culture
Internet Marketing bod
- Location
- The People's Republic Of Suffolk.
I think I might have found your ideal front cog in our spares department at work:
Zakalwe
Well-Known Member
- Location
- Barnsbury, London
I hope you've got long legs 
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Which if you think about it, is ridiculous. Yet, people still buy the Super Sport. You can't even max it on an oval, never mind a public highway.
Indeed - the standard Veyron costs a €1mil to buy, yet it costs VW €5mil to build it. Work that out....And a much bigger bank balance !
Christopher
Über Member
That is because speed to power is a cubic ratio, so to double speed you need eight times the power.
StuAff
Silencing his legs regularly
- Location
- Portsmouth
Indeed so.
How many teeth is on that thing. ?
drawing out the frame structure the front wheel would need to be smaller to accomadate the drive ring which sits just behind it and is driven from the chainring , the drive ring then powers the back wheel.
obviously starting on full power would be hopeless so you would need a rear gear system that defaults to say a 25tooth ring and reduces to a 14-12 ring.
I wonder if anyone does an automatic gear system that runs off centrifugal force to change the gear automatically? -
Wind resistance is a big problem, the Lightning (aircraft) solved its rubbish aerodynamics by overpowering (with enough power you can make a brick fly) so with way more power than it needs it doesn,t have to run effeciently, so if 1revolution/second(1Rs)=18mph@100%effeciency , then at say 50% effeciency you still only need 3Rs to do 27mph.
As for how do you pedal it, - don,t forget momentum, once you get his baby moving its got allot of momentum
and if you can get it so your only pedalling at 3Rs thats a real slow pedal rate to maintain its speed.
you will need some nifty gearing to get the transitional speed to its design speed of 30mph.
the frame position is giving me a posture similiar to a motorbike(imaging the big drive wheel were the petrol tank is) which suggests a fairing which you can drop your head and shoulders behind.
obviously wheels would have to be solid and an aerodynamic fairing covering the drivewheel, possibly your legs as well.
I was considering stability at low speed, and the faf of taking your foot off the pedals, if you had two small staberlizer wheels that flipped down when you stopped and could be flipped up again, you could stay in the pedals all the time. - you would need the automatic gear to return your drive to the optimum position for the speed your doing.
as for "floggin a dead horse" - talk to a dutch butcher prices are high.
drawing out the frame structure the front wheel would need to be smaller to accomadate the drive ring which sits just behind it and is driven from the chainring , the drive ring then powers the back wheel.
obviously starting on full power would be hopeless so you would need a rear gear system that defaults to say a 25tooth ring and reduces to a 14-12 ring.
I wonder if anyone does an automatic gear system that runs off centrifugal force to change the gear automatically? -
Wind resistance is a big problem, the Lightning (aircraft) solved its rubbish aerodynamics by overpowering (with enough power you can make a brick fly) so with way more power than it needs it doesn,t have to run effeciently, so if 1revolution/second(1Rs)=18mph@100%effeciency , then at say 50% effeciency you still only need 3Rs to do 27mph.
As for how do you pedal it, - don,t forget momentum, once you get his baby moving its got allot of momentum
and if you can get it so your only pedalling at 3Rs thats a real slow pedal rate to maintain its speed.
you will need some nifty gearing to get the transitional speed to its design speed of 30mph.
the frame position is giving me a posture similiar to a motorbike(imaging the big drive wheel were the petrol tank is) which suggests a fairing which you can drop your head and shoulders behind.
obviously wheels would have to be solid and an aerodynamic fairing covering the drivewheel, possibly your legs as well.
I was considering stability at low speed, and the faf of taking your foot off the pedals, if you had two small staberlizer wheels that flipped down when you stopped and could be flipped up again, you could stay in the pedals all the time. - you would need the automatic gear to return your drive to the optimum position for the speed your doing.
as for "floggin a dead horse" - talk to a dutch butcher prices are high.
