An actual question my five year old asked me and I couldn’t answer, please help!
In: Physics
all the other answers are wrong.
its actually quite complicated,
you can have 2, 3 or 4. sometimes 5, but never 1 (except in extreme cases)
2 or 3 are usually most efficient for anything from a small pedestal fan to a giant turbine.
the reason why a 10MW Turbine has 3 blades and not 2, is different than
the reason why a plane prop has 4 blades instead of 3.
or a outboard prop has 3 instead of 2
in the first case the big turbine blades are optimised to squeeze maximum efficiency
the second case has to do with lower tip speed and lower noise (keeping it under speed of sound)
TL:DR: It depends!
Latest Answers