Yug
rrProfessor
Location: UK. Herts
| I've been meaning to play around with this for a while to minimise the servo loading when the tail blades are at anything other than zero pitch. The forces on the servo can be quite astonishing and greatly impair the servo speed.
Well then, I got round to it today. With the heli strapped down on a bench and driving the main shaft with an electric drill, I could fiddle about to my hearts content to find the optimum weights. The weights themselfes are simply a longer blade grip bolt with spacers and a nut. I found that the system can be tuned quite easily, and independently setup the left and right pitch all the way to being over pitchy, ie, the blades try to go to full pitch which ofcourse is not desirable. Symmetrical balance is without doubt the preferred setup, weighted such that the blades simply stay on pitch with zero force on the pitch linkage.
Got more fiddling to do in order to find the sweet spot, and it'll also be interesting to find out how much the gyro gain can be reduced with the consequent improvement in servo life, servo gear wear and number of flights on the battery. It will also be interesting to find out if the weights need tuning for different tail blade lengths, weights and profiles.
Vegetable rights and Peace |
the tail servo 'should' be working more or less unloaded apart from intertial linkage forces. One thing I've found on my Raptors is how quickly the pitch slider ball wears.
