Originally Posted by
flytmates
I decided not to use a fail safe for a couple of reasons. First the gear is held up by air pressure and is pretty heavy which will allow it to free fall down. The second is the gear is designed with a new locking cylinder that locks the gear in the down position. In the event of a pressure loss the gear would drop out and all it would take is a little cross control input to lock um in place.
Did you do servo actuated doors? If so, I'd be concerned that the weight of the gear battling the strength of the servo would stop the gear from deploying & send the amperage up high. On my Skygate/Carf L-39 with a Powerbox Royal, I setup telemetry to signal the pneumatic pressure back to my Futaba 18MZ, then set an alarm on the TX to warn me (verbally & vibration) if my pressure fell to =<50psi. Then if I feel the vibration, I'll drop the gear manually via the TX which will sequence the doors also. Works great, & is the best thing I could come up with until Powerbox integrates a pneumatic pressure sensor with a failsafe into their units.
Jay