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

[Troy Newman]

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: Amar Shan 
  To: 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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