Pedrosanchezo
Veteran
- Location
- Perthshire, scotland
and i thought riding along at 35mph+ on the flat (small chain gang) was nippy. I've got to get me one of these bikes!! 
dream super bike
- Thread starter Licramite
- Start date
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- Location
- Shrewsbury, Shropshire
As far as I can find out, it is 51.29mph using a fully faired upright bike over a 200 metre distance with a flying start, ridden by Jim Glover in August 1986. Link
Pedrosanchezo
Veteran
- Location
- Perthshire, scotland
Back to sleep, you are getting up for work in 30 minutes!
cheers 51mph
theres a guy working on a 100mph bike design, from initial views hes very much in a motorbike pose, belly down , arms forward legs back, sort of lying flat forward. - with an Foff huge chainwheel between his legs, so there must be something in this big chain wheel thing.
yes theres a hill near me were I can get 40mph+ on it, head down arse up and hold it rock steady, way beyond my gears no point in pedalling.
theres a guy working on a 100mph bike design, from initial views hes very much in a motorbike pose, belly down , arms forward legs back, sort of lying flat forward. - with an Foff huge chainwheel between his legs, so there must be something in this big chain wheel thing.
yes theres a hill near me were I can get 40mph+ on it, head down arse up and hold it rock steady, way beyond my gears no point in pedalling.
tigger
Über Member
- Location
- Shrewsbury, Shropshire
That's Graeme Obree. There's a thread about his bike here. This is a vehicle still under development and I understand
that it will be fully faired for his record attempt. I hope he does well.
This is the sort of thing you had in mind then?
Edit: Cross posted again - I'm too slow.
2nd edit to correct spelling of Graeme
Zakalwe
Well-Known Member
- Location
- Barnsbury, London
Last I heard he's actually using a treadle, there's no chainring as you would recognise it.
Monsieur Remings
Guru
- Location
- Yatton UK
To the OP, read this above. I have a 53/11 which is a huge gear and means that at around 40mph you can still pedal downhill and make it worthwhile. Anything above 45-50mph and you get down into a tuck. Unless you are Fabian Cancellara, any effort designed to go faster than 50mph plus (excess pedalling and movement as opposed an aero tuck position) is likely to end in instability and/or failure...and possible serious injury/death. Road surface and crosswind are both factors to consider on fast descents, so too is cornering on one side of the road and that's not to mention your own technical proficiency.
Think about what you want to achieve and whether speed as a one off is worth it versus sustainability. Most professional time trials record averages of at the top end of around 45-50kph...
yipes ! -
all very good points, ok, maybe something that would give you a sustanable speed of 30mph.
but having said that I can see just changing the chain ring arrangement isn,t going to do that.
aerodynamics maybe the key to this
back to the drawing board. - and give it a rethink.
did you see the guy in berlin with an electric push bike , bit of a cheat as its not man powered but electric powered and the pedals act as the accelerator.
I,ve been looking in the design magazines about pedal car design , I can see the issues there addressing.
all very good points, ok, maybe something that would give you a sustanable speed of 30mph.
but having said that I can see just changing the chain ring arrangement isn,t going to do that.
aerodynamics maybe the key to this
back to the drawing board. - and give it a rethink.
did you see the guy in berlin with an electric push bike , bit of a cheat as its not man powered but electric powered and the pedals act as the accelerator.
I,ve been looking in the design magazines about pedal car design , I can see the issues there addressing.
ok - this only a design - but look at this
the best distance you can get on standard gears is a a roll out of 9.97m with a 56tooth chainring to a 12 tooth sproket - thats one full pedal revolution.
I just did a design that gives - 75m for 1 pedal revolution
you hook up a 78tooth chain ring to 14tooth sprocket, which is fixed to a 100tooth chainring driving a 14tooth sprocket
ok resistance is going to be high but with a standard 27" wheel 21turns covers a mile. so you only have to turn the pedals say once a second to be travelling 18mph.
all I got to do is build it.
right on the exercise bike up the pressure to max and see what I do and for how long!!
the best distance you can get on standard gears is a a roll out of 9.97m with a 56tooth chainring to a 12 tooth sproket - thats one full pedal revolution.
I just did a design that gives - 75m for 1 pedal revolution
you hook up a 78tooth chain ring to 14tooth sprocket, which is fixed to a 100tooth chainring driving a 14tooth sprocket
ok resistance is going to be high but with a standard 27" wheel 21turns covers a mile. so you only have to turn the pedals say once a second to be travelling 18mph.
all I got to do is build it.
right on the exercise bike up the pressure to max and see what I do and for how long!!
black'n'yellow
Guest
does the term 'flogging a dead horse' mean anything to you..?
StuAff
Silencing his legs regularly
- Location
- Portsmouth
FTFY.
Just to point out and try and give perspective to the wind resistance problem, the Bugatti Veyron uses about 400-ish horsepower to reach 200mph. It needs the other 600 horsepower it has to do the extra 50mph to reach its top speed of 253mph, due to the fact the faster you go, the more resistance you have.
Not bike related but interesting nonetheless.
Not bike related but interesting nonetheless.
