Can someone explain why some helicopters main rotor blades end are swept tip?

Question

wouldn't mind if u guys can give me some sites or books that also explains this.thank you.

Answer 1

You get a quicker response to your control inputs with curved tips. It takes more skill to fly but has better performance, flies more efficiently. I only know this because I fly model RC helicopters and the square-edged rotor blades are more for learning, while the curved tips will let you do aerobatics.

Answer 2

By swept tips if you are referring to the new Apache longbow where the ends of the blades are wider, its to allow the blades to achieve more lift an a reduced RPM. This means the end of the blades don't break the sound barrier which is where you get standard whump whump whump noise from a helicopter.

Answer 3

Could it be because of aerodynamics? Not all helicopter blades are swept tip. Early models were not and some still are not. Most fast moving aircraft are for speed. Good example of swept tip is the AH-64. Good example of not is the Bell UH-1 "Huey"

Answer 4

i guess aerodynamics is the answer. the blade tips of some rotors are exceeding local speed of sound and by sweeping the tips back you lower the actual speed downwards, to the subsonic. quite the same like swept wings of mig15, me262, sabre

Answer 5

It is an attempt to reduce blade tip vortices.

Answer 6

i think what you mean is blade sweeping and is just a maintenance procedure for adjusting dynamic chordwise balance in wich one or both blades are moved aft for alignment. i hope this helps

Answer 7

perhaps to reduce blade flap or noise of the chopper

Answer 8

well i don't have any sites but they are swept in because they need to make friction other wise its like swinging a bat