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From: "DaveLeonard" <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Paul's first flight
Date: Sun, 12 Dec 2004 12:33:56 -0800
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Congratulations Paul!  I have added you to the list of flying rotary powered
aircraft on the Rotary Roster.  An honor held by only 45 individuals. (I
still need to add Mistral - and I am sure I am missing others).

I'm sure you will fix the power issue.  I am able to run up my RV-6 to at
least 5500 RPM at 35"MAP by just holding the brakes, so I imagine you have a
ways to go, especially if you use some chocks too.

David Leonard
The Rotary Roster
http://members.aol.com\_ht_a\rotaryroster\index.html


>
>
> Paul,
> Congratulations on the first flight.  Sounds like it
> was pretty uneventful other thean the power issue.
>
> I had a similar issue in the beginning, but it was
> only a tuning issue, so maybe that is all yours is as
> well.
>
> If you have an A/F ratio gauge, it would help identify
> the problem, but as a guess, I'd say probably too lean
>
> Steve brooks
>
>
> >   You're correct, Rusty....the winds were a direct
> > crosswind 20 knots, gusting higher (windsock
> > standing straight out).  At approximately 3:30 P.M.
> > my SQ2000 slipped the surly bounds of Earth....made
> > a couple circuits around the airport and had an
> > uneventful (yawn) landing.  The precarious part was
> > the take-off and climbout.  I am not getting enough
> > power.  From 1/4 to 1/2 throttle, engine accelerates
> > smoothly and plenty of power. As soon as I try to go
> > above 1/2 throttle, the engine begins to bog down.
> > Advancing the throttle more only made it bog down
> > even more.  On takeoff roll, I was only able to get
> > 4400 rpm's at approximately 1/2 throttle.
> > Acceleration felt OK, and the nosewheel lifted at
> > around 70 knots. Mains lifted off shortly afterward,
> > but it just didn't want to climb. (Flew fine in
> > ground effect, of course).  Unfortunately, I had
> > reached the point of no return (short runway) and
> > past the accelerate/stop point, so I was committed.
> > Found a "V" in the treeline and headed for that.
> > Made it...(whew)....continued slow climb to 2000
> > feet, made a couple of circuits around the airport
> > and had a smooth landing (considering the strong,
> > gusty crosswinds).  Down and stopped by mid field.
> >        I had a few "bugs" to work out, like
> > tightening the tension on the nosewheel, so after 3
> > trips to the runway and back to the hangar, by the
> > time I got to the runway the fourth time, water
> > temperatures were up to 190 degrees.  Fortunately,
> > on climbout they started dropping, and by the time I
> > was downwind, they were stable at 170.  I am pleased
> > that the temperature decreased in the climb.
> >        I have to work on the power problem ASAP.
> > I'm thinking it is mixture related. I had programed
> > the MicroTech ECU to be 10 percent leaner (for all
> > throttle settings), and perhaps that was a mistake.
> > If I remember correctly, you need sufficient air and
> > sufficient fuel to make power.  Because the
> > butterfly in the throttlebody continues opening past
> > 1/2 throttle, I'm reaonably certain that I am
> > getting more air past 1/2 throttle. I am assuming
> > that I am not getting more fuel coming in past that
> > 1/2 throttle position, causing the engine to bog
> > down past 1/2 throttle.  Best RPM I could obtain was
> > 4400 rpm (in cruise with the prop unloaded), and
> > with a 2.19:1 gear reduction,that puts my max rpm on
> > the prop at only 2000. Barely enough to fly, let
> > alone climb out. Will continue problem solving and
> > pass on results.  On the positive side, first flight
> > was successful, aircraft flew well, and no-one got
> > hurt.  I have to count that as a success.  Take
> > care.  Paul Conner, Mobile, AL
>
>
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