Graeme Obree: Hand-building the fastest bicycle in the world
- Thread starter otherself
- Start date
Laz you asked where one eyed jim's statement of power increases with speed ubed ome from.
If it has not been answered already (I may have missed it) and if you have not found already then it ome from here.
F = 1/2CdApv^2
As P = Fv
the P = 1/2CdApv^3
F= drag force
Cd = coefficent of drag
A = frontal area
p = density of air (~1.2kg/m^3)
v = velocity
P = power output.
To do this properly I figure windtunnel testing of various scale designs is needed to work out Cd. It an be done with computor modelling though with the right software. A university areospae department might be able to help. Could make a good final year thesis for someone.
I also think a fairing of some sort will be needed to reduce Cd. It probably does not need a fully enlosed fairing either. Sale model testing would answer that.
If it has not been answered already (I may have missed it) and if you have not found already then it ome from here.
F = 1/2CdApv^2
As P = Fv
the P = 1/2CdApv^3
F= drag force
Cd = coefficent of drag
A = frontal area
p = density of air (~1.2kg/m^3)
v = velocity
P = power output.
To do this properly I figure windtunnel testing of various scale designs is needed to work out Cd. It an be done with computor modelling though with the right software. A university areospae department might be able to help. Could make a good final year thesis for someone.
I also think a fairing of some sort will be needed to reduce Cd. It probably does not need a fully enlosed fairing either. Sale model testing would answer that.
Hi John, Kp, bm 
Sorry haven't got back to this, but it is still firm in my mind. Just got so much stuff to get through right now, but suffice to say no bull "I'm considering buying a sheet of titanium and having a crack at building my design (give or take). Also trying to source sheet carbon fibre. If all fails I'm going to knock up an aluminium/stainless steel/ reynolds-columbus tubing version. I can test the theory without it costing an absolute fortune It'll give me something to do now I have admitted I was addicted to owning bikes, breaking the spell by selling the collection, and am happy to just pour my last efforts in life into designing something new with a taste of old in it
I say we keep this thread alive, it'll certainly give us all something to smile about (as I crash no doubt at speed) when she falls apart Still, they say half the fun is taking part, the other 90% is winning :roll: Later everybody, Laz.
PS: thanks bm, all I have to do know is decipher what it means in english (I joke buddy)
Sorry haven't got back to this, but it is still firm in my mind. Just got so much stuff to get through right now, but suffice to say no bull "I'm considering buying a sheet of titanium and having a crack at building my design (give or take). Also trying to source sheet carbon fibre. If all fails I'm going to knock up an aluminium/stainless steel/ reynolds-columbus tubing version. I can test the theory without it costing an absolute fortune It'll give me something to do now I have admitted I was addicted to owning bikes, breaking the spell by selling the collection, and am happy to just pour my last efforts in life into designing something new with a taste of old in it I say we keep this thread alive, it'll certainly give us all something to smile about (as I crash no doubt at speed) when she falls apart
Still, they say half the fun is taking part, the other 90% is winning :roll: Later everybody, Laz.PS: thanks bm, all I have to do know is decipher what it means in english (I joke buddy)
Hi Laz,
Good to hear from you, I saw your big sell off and wondered what the driving reason behind it was...
As for Carbon fiber there's a Firm in Blackpool (I think) that specialize in Composit Kevlar and fiberglass supply, you may find them with a google search.
If you get no joy I can get you the firms name on Tuesday, I heard about them via the Sidecar people here who use them to supply the raw material for fairings and undertrays.
May I also be the first to wish you my congratulations in deciding to go ahead with your project.
Could i also suggest making some scale models first to test your air resistance theory's, as a rule its usually easier to quantify early designs by checking the results for scale models.
John
Good to hear from you, I saw your big sell off and wondered what the driving reason behind it was...
As for Carbon fiber there's a Firm in Blackpool (I think) that specialize in Composit Kevlar and fiberglass supply, you may find them with a google search.
If you get no joy I can get you the firms name on Tuesday, I heard about them via the Sidecar people here who use them to supply the raw material for fairings and undertrays.
May I also be the first to wish you my congratulations in deciding to go ahead with your project.
Could i also suggest making some scale models first to test your air resistance theory's, as a rule its usually easier to quantify early designs by checking the results for scale models.
John
Re: Graeme Obree: Hand-building the fastest bicycle in the w
http://www.humansinvent.com/#!/13389/th ... e-special/
http://www.humansinvent.com/#!/13389/th ... e-special/
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