Idle question

[John Ferrell]

Don't overlook the factors other than the engine itself.
Servo repeatability at Idle position
Soft mount distortion (watch how much gap there is at idle & full throttle)
Transmitter pots
Slop in mechanics

John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "Paul Horan" <phoran at vvm.com>
To: <discussion at nsrca.org>
Sent: Wednesday, May 12, 2004 12:17 AM
Subject: Idle question


>     My question about idle: is it reasonable to expect a relatively
constant idle (say 2000 -2200) throughout the flight (takeoff to
> landing) ?  My opinion is that this should be so but if the engine -
servo - mixture have Not been set well enough problems will
> result.
>     I typically am able to set my idle so that it is reliable and the
plane will not move when placed on the runway - BUT - when
> landing time comes and I drop back to idle, it is too fast for a decent
landing.  I may need 6 - 10 clicks of throttle trim to get
> it in the ballpark.
>     Am I expecting too much ?  Is this a common problem that some people
have found the answer to ?  The particular engines are a YS
> 91 AC and an OS 91 FX - similar problems with both 2 and 4 cycle engines.
> TIA
> Paul Horan
> KC5NF
> AMA 57131
> NSRCA 3606
>
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