3 ms·
If rotor has 0 friction mounting then sure, no constant torque. Otherwise small constant torque that depends on friction.
by FpUser 4y ago
If rotor has 0 friction mounting then sure, no constant torque. Otherwise small constant torque that depends on friction.
- jessekv 4y agoSee, in physics, you can assume there is no friction. Engineers often forget this one weird trick.
- FpUser 4y ago>"See, in physics, you can assume..." In theoretical model of ideal XXX. Not when asked to actually calculate something practical unless the ideal model is good enough for constraints. I am not an engineer. Actually MS in physics however ancient ;)
- jessekv 4y agoIt's an old engineering jibe, of course :) I suspect that the engineer in the GP's story might not remember the equations for angular acceleration, but has an intuitive sense that if a spinning something is in contact with a non-spinning something, you need a good reason for why some of the energy won't get transferred from the former to the latter.
- cvz 4y agoWhich is balanced by the torque applied by the working fluid that's being shoved through the rotor to keep it spinning.
- Volker_W 4y agoFriction with the helicopter doesn't matter, friction with the air does.