Excelleron Trim and CG

[rcaerobob at cox.net]

Dean, thanks for your comprehensive detail, report, and analysis.  It helps validate what I'm finding with mine, also.  If they made this a 2M job, it could be the "plane of the week" :-)
> 
> From: "Dean Pappas" <d.pappas at kodeos.com>
> Date: 2005/02/02 Wed AM 09:43:44 EST
> To: <discussion at nsrca.org>
> Subject: RE: Excelleron Trim and CG
> 
> Hi Nat, and Hi Terry,
> My Excelleron weighs spot on 9 pounds with the Magnum 120 AR and 15-10.
> The CG is at 7-1/16" and the total incidence (with the 1/16" positive I added) is 3/32" as compared to the stab.
> The plane carried UP elevator trim, until I added the incidence, and the CG had to be about 7-1/4" back to almost get rid of the trim.
> I didn't like how the airplane flew, there: it was just marginally tail-heavy and the "lock" in wind suffered.
> The plane also hinted at climbing out of a 45 climb or dive.
> The snaps are lovely, and high rate elevator will still cause the plane to "bury" in the snap, so it ain't nose-heavy.
> The vertical UP line is straight, and the DOWN line only pulls to the canopy after a full 4 Mississippi count.
> That's plenty good for anything in the schedule.
> The knife edges are dead straight, and there are no electronics used. That was part of my review criteria: entry-level with non-fancy radios.
> The plane knife edge loops beautifully, and when you wail on the rudder in the last 1/4 loop, it does proverse roll a small bit,
> but this doesn't show at the kind of rudder throw necessary for point rolls.
> I think this is the easiest knife edge looping ship I've had my hands on.
> I am contemplating pushing the CG even farther forward, to see if I can get it to trim properly.
> I think a beginner will benefit from a freight train ... I mean slightly nose-heavy plane.
> Regards,
>     Dean
>  
> 
> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net

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