Airtronics Servo 94731

[Atwood, Mark]

Hey Larry,

I think there is more to look at then the servo, but if you do decide to go that route, contact me off line, I can set you up with a 731 or 735 (same thing).  You probably want to do what you can to stiffen the entire assembly, and then possibly increase the mechanical advantage of the control arm, meaning move the control horn further out (less throw) and then increase the throw at the servo.  

Mark


-----Original Message-----
From:	Larry Diamond [mailto:jed241 at email.msn.com]
Sent:	Sat 9/7/2002 3:38 PM
To:	NSRCA List
Cc:	
Subject:	Airtronics Servo 94731

Need a 94731 Airtronics servo. I know they are available at Tower, but don't
want to pay $75 unless I have to...Wife put me on a tight budget....<g>

If you have one you would like to part with e-mail me @ jed241 at msn.com.

Question of the day...I am replacing a 94102 (50oz/in Torq @ 4.8V) in the
elevator... I had a close call with flutter on Elevator input. I'm assuming
that the servo isn't strong enough and caused the flutter.

Plane is about 8 lbs 13 oz; WS 66; L is 64; Engine is 91FX stock muffler;
15% Nitro fuel; 14 x 8 prop @ 10,300 rpm. I'm working on a nose heavy
condition which I think is part of the problem.

It happened on the 1st flight with a 91FX. The engine was upgraded from a OS
91 Surpass II and didn't present a problem with the flutter condition for
about 50 flights.

I was about 2/3rds throttle during trimming at level flight. I banked right
and added elevator. Flutter started after about 90% thru the turn. The nose
dropped slight and lost elevator control when I heard it. Pulled throttle to
1/3rd, prayed as I eased on the elevator and brought it back in....No
apparent damage and hinges look good. Batteries before and after flight was
about 5.0V.

Should I be looking at something other than the servo?

Larry
NSRCA 3083




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