[NSRCA-discussion] Trim Change

[J N Hiller]

I came back in to check the Doppler radar before heading to the field.
I turned on the other airplane to see if the neutral points had shifted. The
elevator centering didn't change at all, didn't even twitch. They are dead
on center just the way they were two weeks ago when I was working on flight
trimming.
Jim



-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Stuart Chale
Sent: Thursday, August 06, 2009 12:43 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Trim Change

Did you try plugging in  a new servo to the receiver in the airplane.  If it
also has centering issues then the problem should be with the transmitter.
Stuart

J N Hiller wrote:
I should have mentioned one other thing I did upon returning home yesterday.
I plugged in another receiver and got the same centering offset. I also
noted the servos seamed to hunt a little (intermittently) between beeping
the trims, classic bad servo pot symptoms. I remember when we had to clean
them several times a season. I don't know if you can clean them anymore, in
any case it isn't worth doing on a $35 servo. By the time the electronics
have a problem the gears are loose also.
I'm down to my last two 3152's and I've held off restocking trying to decide
if I want to change to a JR 2.4 system or stay with Futaba (I prefer to keep
the components matched). I can probably get through this season and next
year I will be flying an all new design with new stuff in it.
Jim
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
<mailto:nsrca-discussion-bounces at lists.nsrca.org>  [
mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bill's Email
Sent: Thursday, August 06, 2009 11:13 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Trim Change
Tony wrote:
Trim change with dual rates in not necessarily a bad pot.  It could be a
good pot that has slipped.  This is very common.  Futaba even went to metal
straps to help stop this.  Pots that are bad usually have dirty control, or
a tight shaft.

I guess I should rephrase my comment to be more accurate. Trim changes are
an indication of a problem with the pots. They may be bad or have slipped.
Either way it is a sign that a trip to the transmitter doctor is in order.






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