Hi again Jim
Thanks for all the info, its nice to hear from someone up on the sport & the rules.
"All bikes are power-limited (by the rider)".
True my friend, but placement & sizes of the parts that permit this power are an open field except for overall bike dimensions. I called them concept bikes because no 2 are alike really, except that they have shells to reduce drag / control airflow.
"Power expended overcoming aerodynamic drag increases with the cube of speed (i.e. the power required to cruise at 80mph is eight times the power required to cruise at 40mph)".
I totally understand what you're saying here, but where does this equation come from that "twice the speed of a bike requires 8times the power to achieve that doubling of speed ?" Have engineers written it down, or calculated it ? It seems an odd piece of science/physics. I only know bits & pieces about aerospace/flying and don't recall learning that an aeroplane needs 8times more power to achieve a velocity capable of liftoff ? If this equation were true, it would apply to ALL vehicles would it not ? ie: a car ? Not questioning your knowledge, simply trying to grasp where it came from
In essence translated to bike speak, " a bike cruising at 40mph on a 56t x 13t (which it probably will) would need a factor of x8 to reach & hold a speed of 80mph ? I'm confused by the maths. This is obviously a resistance question, not a power question
"It's all about the fairing."
What's fairing Jim ? "About how air travels over certain shapes/objects"
What you write is very interesting, so please don't get angry at me if I dig around a little. It's info like this that keeps my brain flowing. Thanks again buddy, yours Laz.
PS: "My design wouldn't be disallowed then ?" Does it contravene any rules you know of ? I've read a fair bit now, but not the exact rule book. What I have read gave the impression of it being open ended in design so long as it has NO assistance from motors/non human powered elements. Use of / conversion of resistance was I assumed within the limits ? Later buddy, Laz.