[NSRCA-discussion] Another trimming question
vicenterc at comcast.net
vicenterc at comcast.net
Wed Oct 25 13:47:48 AKDT 2006
Probably you mean "fairly backward".
Vicente "Vince" Bortone
-------------- Original message --------------
From: "Ed Miller" <edbon85 at charter.net>
> 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"
> To: "NSRCA Mailing List"
> 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"
> > To:
> > 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"
> > >>Reply-To: NSRCA Mailing List
> > >>To: "'NSRCA Mailing List'"
> > >>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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