[NSRCA-discussion] Another trimming question

Wed Oct 25 13:29:26 AKDT 2006

I fly my EMC2 with a fairly forward CG and it too becomes a bit of a handful 
in heavy wind.  Turbulence seems to be constantly rocking the wings.  Being 
under the 1lb per 100square rule ( 1100 squares at 10lbs 7 ounces ) I 
believe has something to do with it also.  I'm going to push the CG a bit 
more forward to see if there is any improvement.
Ed M.
----- Original Message ----- 
From: "Dean Pappas" <d.pappas at kodeos.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, October 25, 2006 2:49 PM
Subject: Re: [NSRCA-discussion] Another trimming question


> 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 >>
> >
> >
> >>_______________________________________________
> >>NSRCA-discussion mailing list
> >>NSRCA-discussion at lists.nsrca.org
> >>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> >
> > _________________________________________________________________
> > Stay in touch with old friends and meet new ones with Windows Live 
> > Spaces
> > http://clk.atdmt.com/MSN/go/msnnkwsp0070000001msn/direct/01/?href=http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us
> >
> > _______________________________________________
> > NSRCA-discussion mailing list
> > NSRCA-discussion at lists.nsrca.org
> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.1.408 / Virus Database: 268.13.11/497 - Release Date:
> > 10/25/2006
> >
> >
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
>


--------------------------------------------------------------------------------


> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion