Sanity check

[David Lockhart]

John,

1.  The real critical parameter is RPM - IF in a clean (ie, pattern plane),
light (7.5lb or less) plane, keep RPM above 9500 and you will be fine.
Assuming 15% nitro, my guess would be no bigger than somewhere around a 13-9
or 12-11 - assuming light pattern plane, I'd go with a 12-9 or 12.5-9.  On a
heavier/draggier plane, more like a 12/13-8.  FWIW - in 1992, I ran either a
13.5-11N or a 13-13N on a Webra 60 w/ 30% nitro at about 9,500 RPM.  The
7.5lb Dash Five was ballistic at will.

2.  100% synthetic is fine.  However, no matter what the total oil content
is, I always run 2% castor as I find it definitely helps with preventing
corrosion - and to add some context, the only fuel I've run long term since
'86 is S&W - which is essentially Klotz synthetic and AAA medical grade
castor.

3.  The NSRCA trim chart method is good - however - I prefer to fly directly
away from myself on a 45 up and do multiple half rolls and watch for any
change in track (in yaw).  And it helps to be flying directly
upwind/downwind.

4.  Too many variables - Ed Alt's previous answers got all the basics.  Hey
Ed, missed you this weekend - wind wasn't that bad - honest - nothing wrong
with 30 degree difference between track and attitude - right?

Dave

----- Original Message -----
From: "Ihncheol Park" <PatternFlyer at sbcglobal.net>
To: <discussion at nsrca.org>
Sent: Sunday, November 07, 2004 10:31 PM
Subject: RE: Sanity check


> Well, I am planning to run 16x4 with my Hanno w/ hanno or Asano pipe.
> I guess 61SF should be able to turn a 15x4.
>
> I've been running full synthetic oil in all my engines ABC, ABN, AAC etc
> without a single problem.
>
> I think I've seen something about the aileron differential in a trim
chart.
> Yes, NSRCA website has trim chart.  That has a aileron differential.
> http://www.nsrca.org/trimA.htm
>
> No idea about the wing tube.
>
> Ihncheol Park
>
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of John Pavlick
> Sent: Sunday, November 07, 2004 7:58 PM
> To: discussion at nsrca.org
> Subject: Sanity check
>
>
> I just want to make sure I'm not thinking myself into a bad place...
>
> Here are some questions you guys might be able to help with:
>
> 1. What is the biggest prop my O.S. .61SF (LS) can swing? No pipe, just a
> muffler and a VP-30 pump setup.
>
> 2. Is it OK to run 100% synthetic oil (no castor) in an ABC motor?
>
> 3. What's the best way to check aileron differential?
>
> 4. How do you fix a loose wing tube socket (on the tube, not in the wing)?
>
> TIA
>
> John Pavlick
> http://www.idseng.com
>
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