Prop solidity and efficiency
not sure if this is the right section but seems the most appropriate place.
studying for my JAA ATPL grounschool and have this question.
with regards to efficiency where prop efficiency = (thrust x TAS)/(RPM x Torque)
it asked what happens to efficiency when solidity were to increase. now i thought that increasing solidity would increase the power that could be absorbed by the prop thus the thrust should increase resulting in increasing efficiency. however, the answer was the opposite, i.e. increasing solidity would decrease efficiency.
could anyone explain?