Hello! This physics problem seems unsolvable to me. I have been trying to figure it out myself but without any success. Maybe I am missing something obvious or I misunderstand the problem. I would be very happy to have any help: The motorshaft and the popeller of a single engine plane have together a moment of inertia of 4.9 kg*m^2. While flying a loop with a radius of 180 m, the propellor has a frequency of 2100 min^-1 and the whole plane has a speed of 210 km/h, the plane needs to use its side rudder to produce a tourque in order to stay in its vertical path. a) To which side does the pilot need to countersteer, if the propellor's angular velocity vector is pointed in the direction the plane is moving? b) How great is the torque needed to keep it on its path (i.e. so the plane doesn't drift off to the side)? It is not clear to me how to get a torque out of this picture. I think there is torque due to the angular motion, the loop, which is vertical to the loop. This torque could be responsible for the drift of the plane ?!