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I have made my third test run trying to sort things
out. I concur on the need for a load on the engine. I have borrowed a
Sensenich (sp?) prop for the test runs, since my Catto prop has not arrived yet.
It is 76x60, and must be severely under propped (76x88 on order).
I started the engine, throttle all the way back,
then one turn forward. Engine RPM on EM-2 ~ 2800. Engine was running rich, max
number of bars on mixture indicator. Tried leaning knob adjustment and it helped
some. Engine seemed to bog some so gave it one more turn forward, then
started playing with injector switches. Turning off the primaries, engine
smoothed out, and RPM shot up to almost 7000, this is with very little throttle
opening! Mixture went lean, and leaning knob had significant effect. RPM would
climb rapidly when I richened the mixture. I cannot get anywhere close to the
22" manifold pressure for some of the adjustments called for in the EC-2 manual.
Will have to wait for the more aggressive prop.
You can see that Rotor 1 is bogging down until I
shifted to Secondaries only on the EGT plots.
----- Original Message -----
Sent: Friday, June 01, 2007 4:24 PM
Subject: [FlyRotary] Re: differsers
Looks Good! John.
I think just about everybody approaches their
first engine start with breath held - its a big moment. Its really a
great morale boost just to have it fire right off on the first try - but, as
you know that does not always happen. Also make certain you have a load
on that engine - zero to 13,000 rpm in a second has scattered drive train
components around garage - so put that prop on for safety sake.
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