Idle question

[Troy Newman]

Paul,

when you first start the motor up its cold, and you set your idle trim. Then 
during the flight it gets hot and leans out. So when you come back into land 
it needs a few clicks of lower trim to get the speed right.

This is what is happening. My suggestion to you is to  #1 richen the low end 
a little until it starts to affect your transition. Then live the outcome. 
The YS will be easier to setup as it has the regulator to control the mid 
range. The OS 91 being a non-pumped motor and no pressure system will be 
much tougher to accomplish the task.

Basically I think your low end mixture is lean on both models.

TN


>From: "Paul Horan" <phoran at vvm.com>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>Subject: Idle question
>Date: Tue, 11 May 2004 23:17:35 -0500
>
>     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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