[NSRCA-discussion] OS 1.40 RX mid range loading up problem

[Jay Marshall]

Ron, is that a re-pitched prop?
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ron Lockhart
Sent: Saturday, February 18, 2006 8:42 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS 1.40 RX mid range loading up problem
 
Set up that is working nice for me is Aeroslave pipe, 22% nitro S&W, OS-F,
15.75 x 10 3blade.
Lean idle setting.
Ron Lockhart
----- Original Message ----- 
From: Bob Harden <mailto:rharden1 at cox.net>  
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Friday, February 17, 2006 9:26 PM
Subject: [NSRCA-discussion] OS 1.40 RX mid range loading up problem
 
Hello All,
 
I need some of your expertise.  I am having trouble with my OS 1.40 RX
loading up in mid range.  The engine has 5 flights and approx 2 gallons of
fuel through it.   I am using an APC 16 x 14 prop,  OS T-6010 Tuned
Silencer, tried the A5, #8 and type F plugs (no difference), Magnum fuel 10%
nitro with caster/synth blend, pipe set for 8000 rpm, and using the short
needle valve.   The low end idle adjust screw is adjusted all the way to the
lean (all the way in) which is necessary to idle smoothly.  Transition
quickly from idle to max throttle isn't too bad but slower than I would
like.  If I set the throttle at 30% to 50% it loads up and and slows in RPM.
In transition from mid to high throttle the  engine vibrates and burbles for
3 -4  seconds before it clears and comes on the pipe, it has even stopped
running a few times.  I have read that some folks use the longer needle
valve and higher nitro to minimize this problem, but I haven't tried that
yet.  From those of you who have experience with this, what is going on, and
what are my options?

  _____  

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