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Date: Sun, 10 Sep 2006 20:40:10 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] It runs!
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Hi Bob,

Congratulations on the engine running.  Be very cautious running
without a prop.  It's incredibly easy to over rev the engine and blow
it up.  I would have destroyed my engine if I had started it without a
prop as I had made a stupid mistake and had the throttle in the wrong
position.  As it was, it went over 6000 rpm instantly on first start.  I
probably didn't do it any good, but haven't seen any negative effects
yet.

I'm a complete novice on the internals of the rotary, but will throw
out something anyway.  Could you have a problem with one or more of the
oil 'O' rings? I think they keep oil out of the combustion chamber.
I'm sure I will be corrected promptly if that' wrong. :)

If I have a suggestion, it would be to replace the gas with a good mix
of oil and see if the smoke clears up.  But please put a load on it.
It's too easy to over rev it. 

My engine smoked some when I first started it, but quit after a few
minutes.  I attributed it to the oil that had been used to protect the
internals while it was sitting around.  Rotating the engine by hand
caused oil to dribble out the intake and exhaust ports when I first
received it.

Bob W.

On Sun, 10 Sep 2006 20:51:02 -0500
"Bob Darrah" <RDarrah@austin.rr.com> wrote:

> Finally started my 20b on the test stand.  It runs, but not very good. 
> Using Tracy's ECU and monitor, and a long (about 10 foot) umbilical cord 
> from the firewall, it will idle about 900 rpm, starts right up, but can 
> hardly get 6000 RPM without prop.  The timing strobe shows about 35 degrees 
> BTDC.  Seems to smoke a lot.
> 
> Possible causes:
>      Too much oil in gas-just dumped in a couple gulups of oil in an 
> estamated 2 gallons of gas.
>      Embilical cord too long.
>      Intake manafold-homemade log type about 4 inch dia, with short (5in) 
> runners, tapering top to botom from log diameter to intake port size, but 
> constant width, the same as the ports.  They match the ports well.  I am in 
> a good position to put the original intake back on to see if that will help, 
> (last resort).
>      Exhaust pipe attaches to where the turbo will go and is a used auto 
> exhaust system, about 18 feet long including muffler.
>      Something else, anyone got any good ideas?
> 
> I would like to get it to run better before I hang it in my Seawind. 
> Hanging it in that airplane is no easy task.
> 
> 
> Bob Darrah 
> 
> 
> --
> Homepage:  http://www.flyrotary.com/
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