Wheelhaus
Veteran
Location: Denver
| That makes sense... I've been learning a little bit about delta offset lately.
(I'm thinking out loud here.)
Problem:
Imagine the blades "teetering" like a playground see-saw.
The advancing blade wants to teeter upward as a result of high lift from oncoming wind, and the retreating blade wants to teeter downward due to the lack of lift. The advancing blade generates more lift, which is then translated into a pitch-up effect thanks to 90° gyroscopic procession.
Solution, Delta offset:
Since you have leading edge grip control, It would make sense to me to use slightly shorter extensions from the grips to offset the ball link from center. (exactly how much shorter I don't know, you'd need to experiment). As the advancing blade teeters up, the offset ball link would cause a bit of pitch to be removed. The opposite would happen to the retreating blade since it wants to teeter downward.
Result:
This would produce a slight pitch down effect, which would only happen in fast forward or fast rearward flight. This slight pitch down effect would potentially curb the slight pitch-up tendency in FFF.
If you were using trailing edge grip control, you'd need slightly longer extensions to get the same effect, otherwise it would have the opposite effect and compound the problem even more.
Super Hornet, does that make sense? I'm only beginning to understand Delta offset so if you know more than I, please contribute!
I may have it backwards, but it's worth experimenting with. By changing delta, the angle of the link will change relative to the main shaft, but the swashplate phase timing (90° from blade) should not change.
..........
Dave
|
. I think the effect however is reduced by the very stiff damping, hence it only shows up in very strong wind. I'll try turning down the control arms to zero offset first to see if it has the desired effect. Thanks for the input Dave.
