4 Vs 5 Terminal dual-rate meter confusion

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So that they make lots more noise :whistle:
It is indeed an issue with some propellors or rotor blades - but not for normal flight. Some fixed-pitch, large diameter props can have the tips go supersonic at take-off power and low airspeed (especially when starting the take-off run). But the blade tips going supersonic reduced efficiency - the supersonic bits are basically turning power into noise :eek:

But what a noise!

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