[NSRCA-discussion] Another trimming question

Wed Oct 25 10:46:32 AKDT 2006

Hello Peter,
Fred and Anthony are onto the basic issue. You will almost certainly have to trade off the "rolling workload" versus damping in turbulence, using CG position. Many flyers trim themselves into borderline tail-heaviness in order to lessen the workload in rolls, but the piper will be paid. I always liked them nose-heavy, myself. I figure predictability is more important. 

I don't know the Impact, personally ... does it generally handle turbulence well? Some designs don't.

good luck,
Dean Pappas

	-----Original Message----- 
	From: nsrca-discussion-bounces at lists.nsrca.org on behalf of Fred Huber 
	Sent: Wed 10/25/2006 2:24 PM 
	To: NSRCA Mailing List 
	Cc: 
	Subject: Re: [NSRCA-discussion] Another trimming question

	Moving CG forward and adding + wing incidence should help upright wind
	penetration... but inverted would then need more elevator correction to
	prevent the nose from dropping, and the plane might have pitch with rudder
	and other effects.

	Typicly I approach trimming from a nose-heavy start. and I do notice the
	plane being affected more by turbulence as the plane becomes better trimmed
	and the CG approaches the point where little or no elevator is needed for
	inverted flight.

	I suggest more expo for softer stick centers, allowing correcting for the
	wind effects with less "jumping" of the model.  If the plane flys the way
	you want when there's no wind... Leave the CG, incidences and the rest of
	the setup alone.

	If just adding expo and a little airspeed does the trick.... its the best
	solution, as it has the least chance of negative side effects.

	FHH
	----- Original Message -----
	From: "Anthony Romano" <anthonyr105 at hotmail.com>
	To: <nsrca-discussion at lists.nsrca.org>
	Sent: Wednesday, October 25, 2006 9:30 AM
	Subject: Re: [NSRCA-discussion] Another trimming question

	>
	> Interesting thinking a little more positive would allow a further forward
	> CG
	> which may  give you a little more stability. Document it so you can move
	> back and give it a try. As I have heard said "trimming is a verb."
	>
	> Anthony
	>
	>>From: "Peter Pennisi" <pentagon.systems at bigpond.com>
	>>Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
	>>To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
	>>Subject: [NSRCA-discussion] Another trimming question
	>>Date: Wed, 25 Oct 2006 08:37:54 +1000
	>>
	>>Hi Guys,
	>>
	>>
	>>
	>>I am looking for opinions.
	>>
	>>
	>>
	>>I am currently flying the COMP-ARF IMPACT with DZ160 which I am very
	>>pleased
	>>with.
	>>
	>>
	>>
	>>Model is flying with no trim and negligible mix. There is no rudder to
	>>elevator mix for knife edge flight and 5% mix at large rudder throws for
	>>rollers etc.
	>>
	>>
	>>
	>>Model climbs as straight as an arrow so I am happy with my thrust settings
	>>and the model pulls ever so slightly to canopy on long down lines which is
	>>mixed with throttle.
	>>
	>>
	>>
	>>The incidence settings are 0 degrees on tail-plane and approximately 1/6th
	>>of a degree positive on the wing. The CG is about right and I don't want
	>>to
	>>go any further forward as it creates too much work when rolling in 45
	>>degree
	>>up lines.
	>>
	>>
	>>
	>>I know most of you will say that the model is fairly well trimmed. The
	>>model
	>>is pure pleasure to fly in the calm and really locks on well however when
	>>the wind comes up it is a different animal to fly. The model gets knocked
	>>around and I find it very difficult to lock in a line. I am only talking
	>>about moderate wind here. My other model (Alliance) seems to handle the
	>>windy conditions better.  I don't want to go any heavier in the nose
	>>otherwise rolls become too much work. I would actually like to bring my CG
	>>further back but it will make the model even more difficult to fly in the
	>>wind. CG is currently 5 mm behind rear of wing tube. Model weight is 4.72
	>>KG
	>>
	>>
	>>
	>>Question: Will changing wing incidence have any effect on model behavior
	>>in
	>>windy weather without affecting the rest of my settings / trimming. I only
	>>have 1/6th of degree positive and I know a lot of people run anywhere
	>>between 0.25 to 0.5 degree on their models.
	>>
	>>
	>>
	>>Thanks
	>>
	>>
	>>
	>>Peter
	>>
	>>
	>>
	>>
	>>
	>
	>
	>><< winmail.dat >>
	>
	>
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