the difference between 20 mph compared to 25 mph
09-27-10 | 10:45 AM
#26
Senior Member
Joined: Aug 2007
Posts: 6,404
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From: RVA
09-27-10 | 11:01 AM
#28
What??? Only 2 wheels?
Joined: Apr 2010
Posts: 13,500
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From: Boston-ish, MA
Bikes: 72 Peugeot UO-8, 82 Peugeot TH8, 87 Bianchi Brava, 76? Masi Grand Criterium, 74 Motobecane Champion Team, 86 & 77 Gazelle champion mondial, 81? Grandis, 82? Tommasini, 83 Peugeot PF10
Really what?
I suppose you are asking about the question of whether v * v is the sole drag component. There could be changes in air's turbulence behavior as speed changes. There could be small resistance components from bearings or chain or tires which are not simply proportional to v squared; for example, as the rider shifts gears the chain resistance changes because its speed changes, though admittedly its contribution may be very small. The rider may hold his/her body differently as the speed or pedalling load changes.
The point is, the algebra is precise but the physical world isn't required to obey it precisely. Or to put it causalistically correctly, the algebra is not necessarily an accurate reflection of the physical world.
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The difference between theory and practice is a lot bigger in practice than it is in theory.
I suppose you are asking about the question of whether v * v is the sole drag component. There could be changes in air's turbulence behavior as speed changes. There could be small resistance components from bearings or chain or tires which are not simply proportional to v squared; for example, as the rider shifts gears the chain resistance changes because its speed changes, though admittedly its contribution may be very small. The rider may hold his/her body differently as the speed or pedalling load changes.
The point is, the algebra is precise but the physical world isn't required to obey it precisely. Or to put it causalistically correctly, the algebra is not necessarily an accurate reflection of the physical world.
---
The difference between theory and practice is a lot bigger in practice than it is in theory.
__________________
Real cyclists use toe clips.
With great bikes comes great responsibility.
jimmuller
Real cyclists use toe clips.
With great bikes comes great responsibility.
jimmuller
09-27-10 | 11:49 AM
#30
Should Be More Popular
Joined: Dec 2007
Posts: 46,197
Likes: 11,755
From: Malvern, PA (20 miles West of Philly)
Bikes: 1986 Alpine (steel road bike), 2009 Ti Habenero, 2013 Specialized Roubaix
For me this is easy....
20 MPH is attainable and sustainable.
25 MPH is attainable but NOT sustainable.
edit: unless I get aero wheels, right?!?
20 MPH is attainable and sustainable.
25 MPH is attainable but NOT sustainable.
edit: unless I get aero wheels, right?!?
