Retreating blade stall and blade design
Sorry to move the thread away slightly from where it started but I have a question.
Main rotor blade design seems not to have changed much for many years - ie blade section is similar throughout its length.
Some Fixed wing modern props have very different profiles to those seen in years gone by - we are told for improved efficiency
Why have heli main rotor blades not seen this kind of change ? and what would a blade whose width is wide at the hub and narrow at the tip do to performance ?
thanks for any intelligent answers ! (plus funny ones)
richard