[NSRCA-discussion] the joy of trim

[Derek Koopowitz]

Does this work when one is doing an inverted 45 as well?  LOL

On Tue, Mar 11, 2008 at 1:27 PM, <shinden1 at cox.net> wrote:

> Now,, we have the Harrison trim method <G>
> Bryan
>  ---- "Dr. Mike Harrison" <drmikedds at sbcglobal.net> wrote:
> > Chad, hold a little up elevator!
> > ----- Original Message -----
> > From: "Chad Northeast" <chadnortheast at shaw.ca>
> > To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> > Sent: Monday, March 10, 2008 4:57 PM
> > Subject: Re: [NSRCA-discussion] the joy of trim
> >
> >
> > > Ok you trim masters, here is a tricky one for you.
> > >
> > > Bryan and I have been through this a bit last year but I ran out of
> time
> > > before the Worlds to fix it and just flew with what I had.
> > >
> > > On my Twister I have this pesky problem, the setup is like so,
> > >
> > > wing = 1/2+ Bryans suggestion and I like it
> > > stab = 0
> > > motor = factory claims 2.5 down, have not measured but could if asked,
> I
> > > have added more to cure a problem see below
> > > CG = has been anywhere from 275 to 300mm from TE mostly with the same
> > > result.  Currently its around 285-290 and it feels good at that point.
>  45
> > > ups inverted track almost hands off if under enough power.
> > >
> > > Symptoms,
> > >
> > > Plane flies well, at this setup I need 0 mix right rudder to ele in
> knife,
> > > and about 2% up ele with left rudder in knife,
> > > about 1/32" down elevator with idle to fix a downline
> > > Added downthrust as the increase in wing inc. and more forward CG
> really
> > > helped the mix in knife and made rollers easier, but forced an
> increase in
> > > downthrust as the plane started pulling to the canopy on uplines.
> > > Downline mix remained the same.
> > >
> > > The big problem I cannot resolve is this, a 45 deg down upright (motor
> at
> > > idle) the plane pitches to the belly and will not track on its own for
> any
> > > length of time.  If I switch the idle-down mix off its rock solid on
> that
> > > line.
> > >
> > > I am open to all suggestions now that I have a bit of time to play
> with
> > > this, I hope Bryan chimes in some more as I would like to continue
> where
> > > we left off last fall.  If you suggest something I will do my best to
> give
> > > it a go and let you know how it works (provided it doesn't snow!)
> > >
> > > The plane is basically super locked in with this setup, except for the
> > > silly 45 down upright, which is a problem in cubans and such.
> > >
> > > Comments and thoughts from the masters are most appreciated :)  I
> consider
> > > myself one of the, cant really trim that well but can fly through it
> just
> > > fine types :)
> > >
> > > Chad
> > >
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> >
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