RCU Forums - View Single Post - PCM Lockout question
View Single Post
Old 05-19-2006 | 11:12 PM
  #12  
Kelly W
My Feedback: (2)
 
Joined: Jan 2002
Posts: 1,015
Received 3 Likes on 3 Posts
From: Delta, BC, CANADA
Default RE: PCM Lockout question


ORIGINAL: ravill

KellyW,

It seems that most folks think that preprogramming a jet to go to "snap roll" deflections is the safest way to burn speed in the event of a pcm lock out, HOPEFULLY, decreasing the danger to onlookers and the pilot. See the rather large discussion regarding the recent deaths in europe...
Wow, sorry to have excited things... Yes, I'm well aware of the other thread. I guess I just misinterpreted what you were asking.

Not that I'm trying to start a 'best lockout option' debate either, but the only pre-programmed control surface deflections I use, and the guys I tend to fly with, is to deploy the speed brake and lower the gear. The rest of the servos hold the last known position. Its just my own preference to have the jet not change its trajectory unless I command it to do so. My reasoning is that if it were locked into failsafe indefinitely, it finds a way to increase the drag and lower the energy state of the model, while the model stays on a consistent vector such that any onlookers can easily predict its path. In a short burst of PCM lockout, it gives me a visual clue of the occurrence, since I may not think to have a look at the glitch counter in my ECU.

Unfortunately its just one of those situations where one can analyze every possible failure mode and never find a 'one size fits all' solution.

Kelly