Why climbing turns are generally 15 degrees?

[navorche]

hello guys ive been told to find out why a helicopter climbing turn is 15 degrees always , i know it is related to the increase in lift needed to climb and keep turning , but the question is ,,,, Why particualrly 15 degrees?

Any help would be welcome.

Thanking you in advance.

 

[JohnSopher]

The rule of thumb for the angle of bank for a standard rate turn is 15% of your airspeed, so 15% of 90 is 13.5 or approx 15 degrees on your attitude indicator.

[Gomer Pylot]

It's just a round number. Your actual bank angle can be whatever you need or want it to be. Whoever told you it's always 15 degrees needs to get a clue. That might be what he wants to see for checkride purposes, but that should be made clear. In general, you don't want too much bank because it reduces your climb rate. But sometimes rate of turn is more important than rate of climb. Sometimes it's not. You use whatever is required to make the aircraft do what you need it to do at the moment.

[adam32]

And if you don't have an attitude indicator (or forgot how to use it) then just turn the helicopter in the direction you intend to go and fly away...