Author Topic: Manual trim..Combat trim messing up calibration (Read 589 times)

olddobe · « **on:** January 07, 2002, 08:04:00 PM »

I bought a new Combatstick,analog,to replace my old tired one.After a short time in flight,P38,manual trim,the nose starts to raise,finally becoming unflyable.I tried everything,recal,new plane,combat trim,nothing worked.CH Products sending replacement stick,and the consensus was that the problem was a defective pot.Even with my old stick I usually have a bit of roll to the left in combat trim.Seems I recall someone saying that using manual trim and combat trim,can cause probs.If anyone can give me some thoughts on this ,I would appreciate it.I use Ch Pro rudders,and a Ch Pro throttle,with a Gamecard3.Might be the Gamecard is hosed.My puter is a 1Mghz,and I heard gamecards don't do so good with faster puters.Tried Rockfire USB adapter,and it causes too many probs.Help!!
Dobe : :

Tumor · « **Reply #1 on:** January 07, 2002, 08:22:00 PM »

I'm not sure I am reading you right but...it appears your plane is reacting as it should WITHOUT combat trim. Manual trim means just that, you have to trim out the aircraft in accordance to a number of variables, namely speed. With speed the nose of your aircraft will tend to pull up, so you trim it down. The roll your experiencing is torque (engine). Combat trim doesn't do a heck of allot for that anyway. What Combat trim does in short, it keeps your aircraft trimmed "about" where it needs to be...although the effectiveness drops as your get really fast or slow so I'm told. Check out Lephturns page, he's got a great writeup.

Tumor

K West · « **Reply #2 on:** January 08, 2002, 08:50:00 AM »

Dobe, if your stick was wandering that bad IMO it would be able to snap you out of auto-trim. So see if you can fly for a long level flight by pressing "X" for auto-trim level on one flight?

Another idea is to try and duplicate what you have been seeing and when it occurs quickly bring up your clipboard and open up the joystick calibration menu and with your hands off the stick see if it's moving on it's own or spiking/wiggling. You can do this while in flight.

I suspect that as you trim your plane and it continues to go faster it is requiring you to trim in little increments more to keep your plane in shape for all axis. In which case more practice with manual trim would be the answer.

Westy

Lephturn · « **Reply #3 on:** January 08, 2002, 08:51:00 AM »

Also, be aware that using manual trim will disengage Combat Trim.

I have an article about trim in AH you might find enlightening about the various trim modes and tools.
http://lephturn.webhop.net/trim.htm

olddobe · « **Reply #4 on:** January 08, 2002, 11:18:00 AM »

Thnx Gents!Indeed it can snap it out of combat trim.Appreciate the tip about bringing up clipboard to see whats going on.New stick arrives this afternoon,so I will see whats going on if it acts weird.Read your Article Lephturn..read all your articles..you have been very helpful,as well as some other folks.People that try to contribute and help in AH are very much appreciated by me,and others just learning, <S> all!
Dobe