Looking for some help from other instructors with the following question?
"If flying a constant radius turn (constant IAS) around a ground feature with a constant wind where will be the Maximum and Minimum angle of bank?"
According to Wagtendonk, considering ground speed and drift as variables, Angle of Bank is greatest immeadiately downwind and least immeadiately into wind to produce the required CPF to maintain the desired radius.
However in practise (I have asked my peers and who tend to agree) the max/min A of B appears to be further toward crosswind than these points...
Why? presumably the above theory is not incorrect rather that there are more variables at play..?? any bright ideas?? I have read Cyclic and Collective to no avail and can't get my hands on a copy of Prouty at present.
Not sure if this is the place for such debate but doubtless I will soon find out... any imput would be appreciated.
One idea ready for rubbishing....
1: As the aircraft turns crosswind the rotor disc is tilted relative to the wind, this increases induced flow when downwind of the ground feature (disc tilted into wind) and decreases induced flow when up wind of the ground feature (disc tilted away from wind) with subsequent increase/decrease in TRT and CPF production.
To compensate the pilot increases/decreases angle of bank to maintain constant radius (whilst adjusting collective to maintain height)