Composite-ARF Impact question

[Keith Black]

OK guys, all this talk has gotten me to take another look at my new Impact.
Here's what I see.

1) I cannot detect any twist in the fin. Perhaps someone can tell me how to
look for this, but I can't see it.

2) If I measure for straightness in the fuse it is not perfectly straight.
It's hard to tell if the left side is just a little fuller (puffy) or if it
is bent. Whatever the case, it's not perfectly symmetrical. I did notice
when mounting the gear that the *inside* of one half was slightly flatter
than the other side.  Specifics of my measurements: I lined up the fuse on
graph paper and measured for straightness by setting the nose on the center
line and the tail on the center line. I then took measurements periodically
along fuse checking the distance from the center line (using a square). At
the most extreme point the left side is wider by about 1/4". To double check
I then centered the mid-point of the fuse and the nose. This resulted in the
rudder being about 1/4" off to the right.

I know it's preferable to have a perfectly straight fuse, but considering
the overall size of the fuse, how well I've seen other Impacts fly, (and the
fact that I already own it), I'm not going to worry about. With all the
right thrust discussions held lately I'm sure I can get it trimmed to fly
fine. Also, given it's a molded fuse I'm sure that Jason's was the same and
he did pretty well with his ;-)

BTW, I did the same measurements on both of my Aries fuses prior to building
and they were extremely straight. Knowing all the work Lance and Gray put
into the Symphony I'm sure it's dead on as well.

Keith Black

----- Original Message ----- 
From: "Bill Southwell" <bnbsouthwell at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Tuesday, February 01, 2005 8:42 PM
Subject: Re: Composite-ARF Impact question


>
>    Hi Adam,
>
>    Hey at least no mention of concubines or other strange behavior. If
> all of you are having a vision problem ( mass hallucination) there will
> be a  group therapy session at the NATS. I hope this will help all
> CompARF customers to get with the program...err ah how not to see
> things.  It is funny its no manufacturing error but everyone has had the
> same issue. I bet the fellow who crates the fuselages gets a broom
> tomorrow to work with. You have to be in awe of his consistency in
> applying pressure to each fuse. Thank goodness he studied the
> aerodynamics of the thing...he must be a genius as all 350 fly dead
> straight now!
>
>    If a manufacture in the states created a ahhh a well...... "visual
> effect"  like that people would be slamming the same for lack of quality
> and ripping the customer off.  I have talked to several friends who have
> the gassser CompARF planes and they have reported quality issues  and
> felt that for the money it could have been better. guess its a case of "
> international tolerance and good will" at work here ( Geez now I am
> sounding like Mike Savage). I say don't be intimidated and demand a
> refund for the banana. He gives you all your ammunition in his
> reply...well at the bottom any how.  I still think if he added something
> with concubines and court it would be more interesting to
> read...................................................Just basking in
> the flames here :>)
>
> Regards
> Bill   " medium to well done" Southwell
> Iuka, MS
>
> Adam Quennoz wrote:
>
> > I'm glad to see others are seeing the same thing.  I thought I was
> > nuts.  I e-mailed Composite-ARF about this issue.  Here's the reply:
> >
> > Hello Adam,
> >
> > since 350 Impacts come from the same molds, and all fly perfectly
> > straight,
> > there is no manufacturing error in yours.
> >
> > The center line (seam line) is a little bit out of center, this might
> > make
> > it appear not straight, possibly.
> >
> > If the fuselage got pressure during shipping / storing, so that the
> > fin was
> > slightly twisted in the box, this can be easily fixed when gluing in the
> > rear hinge post. But actually, I do not think that you would have to
make
> > any corrections, as I know that the fin appears to be a little bit
> > off, but
> > it doesn't. the planes fly dead straight.
> >
> >
> >
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>
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