3 ms·
> I'm curious - what ebike do you have that can easily cruise at 48-53 kph for extended periods? Those speeds sound like bogus. I can maintain about 40kph on m
by antisthenes 5y ago
> I'm curious - what ebike do you have that can easily cruise at 48-53 kph for extended periods?
Those speeds sound like bogus. I can maintain about 40kph on my ebike on a flat surface, but that requires pedaling in addition to the motor and is a fairly energetic exercise.
Also, pushing beyond 45kph, you really start to feel the air resistance and it becomes exponentially harder to go beyond 45kph for any long period of time, unless going downhill.
Most ebikes don't really come with the chainring size to go up to high speeds, unless modified with a giant 50+ size, which is more apt for racing road bikes (non-electric)
- sokoloff 5y ago> you really start to feel the air resistance and it becomes exponentially harder to go beyond 45kph Nitpick: it becomes cubically harder. ;)
- antisthenes 5y agoNitpick to nitpick: cubically is a subset of exponentially.
- newaccount74 5y agoYou are both wrong. Air resistance increases quadratically with speed, not cubically. And you mixed up polynomial with exponential. Quadratic: x^2 Cubic: x^3 Polynomial (eg. 3rd degree): a + b x + c x^2 + d x^3 Exponential: e^x
- sokoloff 5y agoDrag force rises quadratically with speed. Power is force dot velocity; in this case force and velocity are in the same direction, so dot product becomes simple mulitiplication making drag power (exertion, formally: work per unit time) cubic with speed.
- newaccount74 5y agoOh, you are right! Sorry.
- antisthenes 5y agoI'm not wrong, because I wasn't commenting on the power of the exponent. But thanks for being a typical HN.