[NSRCA-discussion] triangulation trimming

[shinden1 at cox.net]

Great feed back Derek!
keep us informed 
what airplane are you flying ?
Bryan
---- Derek Koopowitz <derekkoopowitz at gmail.com> wrote: 
> I finally got some time to do some meaningful setup and trimming on my
> plane... out of the box without checking any incidence/thrust the plane
> pulled quite a bit to the canopy in up and downlines.  I also had downtrim
> in the elevator and just didn't feel good about the plane in the lines.
> Rolls were fine.
> 
> During this past week I found out the thrust/datum line from the designer
> and then set the wing to a little less than 1/2 deg pos. and the stab at 0.
> Got to the flying field - checked CG range (good) - checked weight (good)
> and then filler up and took off.  I never touched elevator trim it was that
> good.  I had to change aileron trim a little (expected) but now the plane
> flew like it was supposed to.  The upline pull to the canopy was just about
> gone and so was the downline pull.  I did mix in some down trim with low
> throttle to fix the downline.  I did find that one of my elevator halves is
> slightly misaligned even though it is flush with the tips - this caused a
> loop/pull/push to change direction slightly.  KE left rudder caused a push
> to the belly and a slight roll to the right - right rudder was a very slight
> pull to the canopy and a slight roll to the left.  It was blowing about
> 10mph pretty much down the runway while trimming.
> 
> After landing I adjusted the left elevator half by going out 2 full turns on
> the clevis.  I flew one more time and the loops were now perfect but I had
> to add down trim now to fly level (and adjust aileron as well).  The slight
> pull to the canopy in the upline is still there but I'm going to increase
> wing incidence a little more now to fix that.  I'll probably be a little
> over 1/2 deg. positive on the wing when I try again.  Overall the plane is
> tracking/flying a lot better now.
> 
> By the way... I did not change thrust at all on the plane.  It comes
> standard with 3.5 deg. right and 0 down and thats the way the designer built
> it and flies it successfully - top 10 at the WC's.
> 
> On Sun, Mar 16, 2008 at 7:17 PM, <shinden1 at cox.net> wrote:
> 
> > Lance you need to find out exactly where the wing  inc . is.
> > I think if you move your c/g back a little it will help take some of the
> > up trim out But you prob need more pos inc, in the wing so we need to know
> > where you are at right now to determine exactly where to go
> > Bryan
> >  ---- Lance Van Nostrand <patterndude at tx.rr.com> wrote:
> > > Bryan,
> > >
> > > The discussion list moves faster than I can try this stuff out.  Too bad
> > I
> > > have to work...
> > >
> > > I first only moved my CG forward significantly and have improved overall
> > > tracking.  It was windy Saturday and wind penetration were good.
> >  Bryan's
> > > suggestion was correct on CG movement to make this improvement.  However
> > > with the forward CG (and resultant uptrim)  it pulls to the canopy
> > slightly
> > > on downlines.  At this point I noticed that during inverted flight,
> > rudder
> > > input caused a pull to the belly (plane rose).  This was weird.  I then
> > > raised the incidence 2 turns and it fixed the inverted flight problem
> > but it
> > > seemed to make the canopy pull worse.  Interestingly, KE flight was not
> > > noticeably affected.
> > >
> > > The other affect is that inverted 45 downlines drop toward earth faster
> > than
> > > upright 45s (which track nicely).  Before this change, both 45s were
> > fine.
> > >
> > > Is this the expectation?
> > >
> > > --Lance
> > >
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