Answer / rishi barnawal

Best compromise is achieved by choosing 3 blades between equilibrium, cost and weight of fan.

Answer / nba

The torque required to run more than three blade fan goes on
increasing as no. of blades increase. Thus, Three Blade Fan
is ideal..

Answer / himanshu chudasama

Its an simlpe as per angle placement as well as balacing
formula angle should be 120 degree minium and if we
consider 360 for round air cathcment area for fan 360
divide by 120 so we will get 3 blades minimum kept for fan
for the balanced efficient use of it.

Answer / ramesh

because of the equlibrium balancing capability of the 120
degree apart placing of the wings

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