Trim Chart at NSRCA website

[Verne Koester]

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
>
> =====================================
> # To be removed from this list, send a message to
> # discussion-request at nsrca.org
> # and put leave discussion on the first line of the body.
> #
>
>

=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#