[NSRCA-discussion] triangulation trimming

[J N Hiller]

Lance I thought I was going nuts about 30 years ago when my first pattern
airplane (Southern RC 'Compensator') pulled to the belly with rudder when
inverted. I think it also did it right side up but I never got as far off
line requiring less rudder input. It was weird to fly. Thanks for the
memories.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Lance Van
Nostrand
Sent: Sunday, March 16, 2008 5:56 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] triangulation trimming

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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