Christian Mayer wrote: > > Dave Martin schrieb: > > > > I've found that the only way to maintain a straight track over the > ground is > > with 10-15deg bank. Based on having watched many helis fly, I don't > think > > they usually bank to maintain track (I could be wrong on this). > > A fast flying heli will always have a bank angle. > > Why? > A rotor blade produces lift proportional to the speed dof the air around > it. > When the heli flies foreward, the blades that are also moving foreward > (on a clockwise rotating rotor the left side) are producing a higher > lift than those that are going backwards. The resulting force will > create the bank angle you've experienced. > (Or mechanical: the center of lift moves to the side. And the center of > gravity -which is fixed- will always be in a stright line below it. So > the heli will bank untill these centers are aligned again) >
My rotary wing experience is very limited, but I seem to remember that the advancing/retreating blade effect, which you correctly describe, is at least in part compensated by hinging the blades so that they flap up and down and fore and aft. The helicopters that I flew certainly didn't fly with a noticeable bank angle so far as I remember. It was 20 and more years ago, though. Regards, Vivian _______________________________________________ Flightgear-users mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
