I saw a better example but here is one. Notice the non constant vehicle movement ?
and another one a bit better but still not the one I was searching for.
The first video doesn't seem to show much in the way of speed variation. The second video shows the gear driving the track slipping from time to time and I'm not sure, but I think the fan is being turned on and off so it doesn't blow so hard. If it blows too hard the gear slips and the vehicle goes nowhere.
Either way, the storage has nothing to do with nothing. You just provided two examples of vehicles moving INTO the wind being powered by the wind. The first one even goes up a 30 or 40 degree ramp!
When are you going to respond to my prior post about the power to hold a vehicle stationary? You've already said the power was zero if the bike rider simply puts his weight on the pedal into a 20 km/s wind. So doesn't the rest follow, the equations are as I've shown them?
Quote from: electrodacus on Today at 07:33:23 pm
A rider with sufficient weight standing on the pedal will still be a form of brake. It is a gravitational based one but still a brake.
Let's just deal with one detail at a time. So do you acknowledge that the correct equation for the power at the wheels to move the vehicle into the wind must contain a factor which is just the velocity of the vehicle relative to the ground the wheel is pushing against?
The force from the wind is
Fd = 1/2 · Cd · A · p · (vw + vo)^2
The power required at the vehicle wheels to maintain a speed into the wind is
Pv = 1/2 · Cd · A · p · (vw + vo)^2 · vo
Correct?