3 ms·
Aye, where do the wheels get the energy from? Actually, more seriously, is there any point where the net torque on the drivetrain is zero? Assuming you're happ
by yodelshady 5y ago
Aye, where do the wheels get the energy from? Actually, more seriously, is there any point where the net torque on the drivetrain is zero?
Assuming you're happy that, so long as the wheels are low-friction, that's no difference between "Downwind faster than Wind" and Upwind, and that a single design of craft can do both Downwind and Upwind, then all you need for the "dead air" part is to store energy in a battery, spring or flywheel.
- namlem 5y agoThe energy comes from the air. The air molecules in the wake of the propeller have lower kinetic energy than the rest of the air.
- cblconfederate 5y agoGravity. Without it the wheels wont have sufficient friction to generate torque
- yodelshady 5y ago> Gravity I'm sorry but you're either answering a different question than "where do the wheels get their energy from" or extremely confused. We're on a flat plane normal to the direction gravity acts, so I'm going to let you go out and work out how much energy gravity can provide there.
- cblconfederate 5y agoYou 're right, gravity provides the force of friction but not energy. The energy is from the pressure of the wind, the device just makes better use of it compared to a fan-less cart.