Originally Posted by Mr Selfish
I think the collective issue needs clarification. It’s not that the collective “creeps” on a properly set up Hiller or B47. It’s the fact that even on an allegedly/apparently well set up machine, given the right conditions wind gust/cyclic input/angry god, the collective can slam
. Beware! I’d been flying the ’47 that nearly killed me for 3 days prior to it’s “satanic possession episode” I was in smooth air with the collective friction done up. After the loop
the AC was inspected, the broken engine restraint cables replaced (broke in the violent manoeuvre)and pronounced OK
I flew it for a few more days (with a firm grip on the collective) with no reoccurrence.
The Hiller collective "creep" is related to the AUW at the time and how the well the particular machine is rigged. The collective spring bungee on the firewall has a lot of input into which way the collective will go in a badly rigged machine.
Here is some info which will help:
http://brumbyhelicopters.com.au/hiller12erotors.htm
The B47G with metal blades can have similar probs - hydraulics off - if not rigged correctly - including checking the effects of the balance weight washer stack on the R Head in Auto.
Hope this helps.
T