kennethw
Senior Heliman
Location: Singapore
My Posts This: Topic Forum | I'm still tuning my 50-size 4-blade, but did find yesterday that my phasing was off.
It was not advanced enough from the +36 degrees and the effect of that was when I give only forward cyclic, the heli would tilt forward, but also to the left. Vice versa was true for backward cyclic. Similarly, when I give only right cyclic, the heli would tilt right, but also forward.
Because of this, every little cyclic input required a lot of correction and therefore the heli 'seemed' to drift.
My Phasing is now +47 degrees and cyclic movement of the heli is correct, and I can hover hands free (nearly). Need to adjust the Aileron and Elevator settings a little.
I don't know why I didn't clue into this on the bench ealier as I did what I always do: at zero pitch, align one set of blades along the boom so they are parallel and give Elevator input and there should not be any movement. It seemed to be OK like with all my other Multi-Blades (but obviously this one was a little off, maybe my eyesight is going, I am using reading glasses now).
I should have looked at the position of the actual linkage ball on the swash. It looked more like 45 degrees and I should have clued into that.
Although it is working now, I've taken the heli apart because I need to change the drive ratio and also I don't like the way the Century head is in stock mode, so will be doing a little simply modifications to make it work better.
You asked what Hiller Gain I'm using, well, these are my present settings:
..... Elevator / Aileron
Control Rates: 100/120
Bell Gain: 30/35
Hiller Gain: 55/45
Damping Gain: 16/12
Tail Drag Comp: -6/0
Hiller Decay: 60
Hope this helps. |
