dkshema
rrProfessor
Location: Cedar Rapids, IA
| From your description, I'd guess that you have too much cyclic pitch for aileron and elevator. Six to seven degrees max is about what you should be shooting for. That, on top of the +12 you say you are getting puts you at a total of 18-19 degrees pitch, and about 17 degrees is about all you can stand before bad things start happening -- blade stall. You'll be getting all sorts of weird behavior, I would think. Nose pitching up or down, or a tendency to roll left/right -- depending where around the rotation the blades stall.
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Binding of the mechanics up on the head is common for many heli designs when you have lots of collective pitch coupled with lots of cyclic pitch and go to one of the corners on your transmitter. That's why people have installed and use cyclic rings. They simply keep the sticks out of the corners where the binding occurs.
Binding up in the head is a great way to kill off your head speed when doing anything more than mild maneuvers.
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If you need more cyclic travel while reducing your overall control movement, consider using a set of longer balls on the swashplate that go to the long links from the swash up onto the head. You can buy steel balls from Miniature Aircraft and other heli manufacturers that are threaded with 3mm shanks and are anywhere from 9 to 11 mm in length. I'm using some 9mm balls on my swash, it could easily take the 10mm version.
Secondly, you can move the balls up on the beller mixing levers (the ones that droop down on the flybar, and whose short link goes to the main rotor grips) from the inner hole, to the outer hole on the levers. Moving these links to the outer hole increases the amount of travel the main rotors see with respect to the movement of the longer pushrods attached to the swash.
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* Making the World a Better Place -- One Helicopter at a time! *
Dave |
