RPM turned by YS-140L on Mezlik 16-12?

[Amar Shan]

Oops, forgot a couple of key details!
 
Running 25% Cool Power – at sea level.
 
I did run an APC 15-12W – it was tach’ing about 8300-8400 on the ground.
I’m getting much better performance out of the Mezlik 16-12, even though
it’s only turning ~7800-8000 on the ground.
 
The engine has fewer than 2 dozen flights on it since a Performance
Specialities (Verano/Shadel) rebuild.  (It didn’t have much more than
that number before the rebuild, either.  Rebuild was done because I sent
it in with a complaint of difficulty starting, not because of crash
damage).
 
Amar
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Troy Newman
Sent: Thursday, September 19, 2002 12:20 PM
To: discussion at nsrca.org
Subject: Re: RPM turned by YS-140L on Mezlik 16-12?
 
Amar,
 
by the numbers you have given I'm guessing you are only using 15-20%
Nitro....Up at altitude 6000ft we run the 140L at about 1 turn open on
25% nitro....Reason less air needs less fuel....The problem is I bet you
might be turning too much prop......Try a little less prop and get your
RPMS up a bit...A 15-12W is a good one.
 
More nitro is always a good thing too....Nitro helps the idle
consistence....If the motor has some time on it it might be do for a new
ring...I would say about 200-300 flights depending on the level of
use-abuse.
 
 
Richard at at YS will hook you up.
 
 
Troy Newman
----- Original Message ----- 
From:  <mailto:shan at smartt.com> Amar Shan 
To:  <mailto:discussion at nsrca.org> discussion at nsrca.org 
Sent: Thursday, September 19, 2002 12:28 PM
Subject: RPM turned by YS-140L on Mezlik 16-12?
 
Hello all,
 
I am running a YS-140L with a Mezlik 16-12 in a Python which I have
recently re-introduced to the air.  The engine seems to run ok, but
feels very anemic in the air, which prompts me to wonder whether it’s
just a heavier, draggier plane than I’m used to (was flying an Olympian)
or whether the engine isn’t running quite right.
 
A few observations:
 
The engine is turning ~ 7800-8000 rpm on the ground.
With the regulator set flush, high end needle is only out about ¾ of a
turn?!?
Transition is decent; however, when throttling down from high rpm to
idle, the engine doesn’t seem to ever return to the same idle.  
 
Is the engine producing its expected power?  If not, any suggestions as
to where to begin looking for problems?  Replace all the gaskets first?
 
Thanks in advance,
 
Amar
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