Trim Chart at NSRCA website

[Bob Pastorello]

But be careful!!!  Moving the CG back, and the resultant addition of DOWN
elevator trim becomes "belly pitch" on knife edge.  That's where the
interaction of decalage and thrust become significant.
    I agree with Verne - set CG first, and use roll stability to set
it....Then, off to the other things.

Also remember that EVERYTHING interacts....and if you change the CG, even
just a small amount, you need to go through the process all over again.

Bob Pastorello
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message -----
From: "Verne Koester" <verne at twmi.rr.com>
To: <discussion at nsrca.org>
Sent: Sunday, October 06, 2002 9:43 AM
Subject: Re: Trim Chart at NSRCA website


> Ihncheol,
> The pitch on a power-off downline is controlled by the elevator trim. If
> it's pitching to the canopy, you need to do something that will require
down
> trim to fly hands-off straight and level. From where your trim is right
now,
> if you add positive incidence to the wing, you'll have to add down trim on
> the elevator to maintain hands off straight and level flight. That down
trim
> will eliminate the pitch to the canopy on your vertical down. Most planes
> need about 1/3 degree positive incidence in the wing to fly right. Moving
> the CG back will also require down trim to fly straight and level. I use
> rolling maneuvers to tweak the CG. If you can't do a slow roll without the
> plane going nose down before it's time to add rudder, move the CG back.
>
> Verne
>
>
> ----- Original Message -----
> From: "Ihncheol Park" <PatternFlyer at msn.com>
> To: "NSRCA" <discussion at nsrca.org>
> Sent: Sunday, October 06, 2002 4:49 AM
> Subject: Trim Chart at NSRCA website
>
>
> > Hi, All,
> > I am still trimming my pattern plane. So far, it has 20 flights.
> > I was browing the NSRCA site and found these.
> >
> > 1. Decalage, Angle of Incidence: Power off vertical dive from high
> altitude
> > with elevator neutral.
> >   B: Model pulls to canopy >> Increase wing or stab incidence??
> >    I think it has to be decrease wing or increase stab incidence.
> >
> >   C: Model pulls to belly >> Reduce wing or stab incidence??
> >    I think it has to be increase wing or decrease stab incidence.
> >
> > 2. Knife Edge Pitch: Normal pass roll to knife edge, left & right, use
> > rudder to hold model level.
> >   B: model pitches to canopy >> Move CG aft, increase wing incidence, or
> mix
> > down elevator w/ Rudder.
> >
> >    Isn't this supposed to be move CG aft, decrease wing incidence, or
mix
> > down elevator w/Rudder?
> >
> > Am I right? If not, can anyone clarify these?
> > Thanks,
> >
> >
> > Ihncheol Park
> > CompTIA A+ COMP10648565
> > 1973 White Ave., #402
> > Moscow, ID 83843
> > (208) 883-7882 (home)
> > (208) 661-5018 (cellular)
> > PatternFlyer at msn.com
> >
> > =====================================
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> > #
> >
> >
>
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