<br><font size=2 face="sans-serif">Hi Guys,</font>
<br>
<br><font size=2 face="sans-serif">Just been through the alignment process
of the Impact. Although many are using 'zero-engine downthrust, zero
stab, 0.25 wing, I decided to jig the fuse such that the nose gave 1 degree
downthrust. Then measured for a zero stab and 0.25 wing. At the top
of the rudder, just measure the width and split it with a small hole for
a T-pin. I then temporarily insert a small section of balsa for the
bottom of the T pin to stick in. I then used some extra control line
wire looped around the T pin, to take measurement to the wing tips and
stab tips.</font>
<br>
<br><font size=2 face="sans-serif">Thanks,</font>
<br><font size=2 face="sans-serif">Jim</font>
<br><font size=2 face="sans-serif"><br>
</font>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>Derek Koopowitz <derekkoopowitz@earthlink.net></b>
</font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">03/30/2005 04:33 PM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
Derek Koopowitz <derekkoopowitz@earthlink.net></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">discussion@nsrca.org, discussion@nsrca.org</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: Composite-ARF IMPACT question</font></table>
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<br><font size=2><tt>Jim,<br>
<br>
Based on the discussions I've read on RCU... don't rely on the seams to
provide you with a measuring point for the stab or wings. I've read
that these can be off as much as 3mm. I would take some other measurements
- perhaps from the bottom of the rudder post to the trailing edge of the
wingtip, for instance.<br>
<br>
-----Original Message-----<br>
From: "J.Oddino" <joddino@socal.rr.com><br>
Sent: Mar 30, 2005 1:03 PM<br>
To: discussion@nsrca.org<br>
Subject: Re: Composite-ARF IMPACT question<br>
<br>
Lance, I hope you are right. I've spent days trying to determine
where the<br>
centerline (top view) of the fuse is. Then I read where Erik said
his was<br>
set up per the instructions so that is what I did. I set the wing<br>
perpendicular by measuring from the top center of the vertical fin to the<br>
wing tip trailing edges and from the fin to the corner of the ailerons.<br>
Then I set the stab perpendicular by measuring from the seam at the spinner<br>
ring to the stab tips at the trailing edge. The distance from wing
tips to<br>
stab tips is the same on both sides but I can measure some other stuff
that<br>
says something is wrong. If it tracks okay I won't care because I can't
see<br>
a problem without all my jigs and tools.<br>
The bottom line is if you don't like spending a lot of time to get it<br>
perfect buy an ARF. Having said that, I have never checked any of
my ARFs<br>
to see how good they are in the plan view. If it was easy we wouldn't
be<br>
doing it.<br>
Jim O<br>
----- Original Message ----- <br>
From: "Lance Van Nostrand" <patterndude@comcast.net><br>
To: <discussion@nsrca.org><br>
Sent: Monday, March 28, 2005 7:51 PM<br>
Subject: Re: Composite-ARF IMPACT question<br>
<br>
<br>
> Eric,<br>
> Glad the plane is a winner. I'm curious about something.<br>
><br>
> A while back there was a thread on this plane that discussed a bit
of a<br>
> bannana bow in the fuse. I assume yours has this, like the others,
and it<br>
> is inconsquential. right?<br>
><br>
> My curiosity on this stems from an even earlier thread about how flat
a<br>
> table you need to make wings and how much wing bow is too much. From
what<br>
I<br>
> remember, the conclusion was that if you can't use your wing trailing
edge<br>
> as a reference line for laser optics than you are doing something
wrong.<br>
><br>
> This struck me as funny since I've flown some excellent planes that
had<br>
some<br>
> wing warp and am of the radical opinion that there is a true error
band<br>
> where a little wing bow (I'm talking maybe 1/8" over 32")
is unnoticeable.<br>
> Yes, it is measureable but if no one can tell the difference than
No<br>
flatter<br>
> is not inherently better. There's always a point on the way
to perfection<br>
> that we consider as good enough and another point where we say that
our<br>
> tools will not allow us to measure any smaller deviations. They
are not<br>
> necessarily the same point!<br>
><br>
> I've never done an engineering study but I would love to know when
the<br>
> wing/fuse is straight enough, so that after that point I am only pursuing<br>
> the perfection of the craft, or to impress my friends, or to see if
I can,<br>
> or whatever.<br>
><br>
> --Lance<br>
><br>
> ----- Original Message ----- <br>
> From: "Grow Pattern" <pattern4u@comcast.net><br>
> To: <discussion@nsrca.org><br>
> Sent: Sunday, March 27, 2005 5:46 PM<br>
> Subject: Composite-ARF IMPACT<br>
><br>
><br>
> > Yesterday was good enough for testing pattern planes in southern
NJ.<br>
> ><br>
> > I am pleased to report that if you have not yet flown your new
IMPACT<br>
you<br>
> > should be pleasantly surprised.<br>
> ><br>
> > I was delighted with mine from the moment it left the ground.
It took a<br>
> > while to program the OS mixture carb due to the cooler temperatures
and<br>
a<br>
> > new liner and piston/ring.<br>
> ><br>
> > After the first flight the only mix that I could see that will
be needed<br>
> > will be a tiny bit of roll correction in one direction.
After a<br>
> > length-of-the-field knife-edge KE test you could get about 1/4
of a roll<br>
> > in the opposite direction to the right rudder input. There was
no<br>
elevator<br>
> > trim required at all.<br>
> ><br>
> > Thanks to a first class incidence-setting job by George Asteris
the<br>
plane<br>
> > flew great from the outset. Some planes just feel right as they
leave<br>
the<br>
> > ground. This is one of them. Thanks to all of the throw-setting
advice<br>
in<br>
> > the thread there was no real need to change anything. Spins were
solid<br>
> > with rudder and elevator only, The 2-turn reverse was as good
as the<br>
> > pilot's timing.<br>
> ><br>
> > Because it is an IMPACT with top ailerons it has the signature<br>
Pterodactyl<br>
> > "screech!" when you snap. You just add your own "whooping!"....<br>
> ><br>
> > Regards,<br>
> ><br>
> > Eric.<br>
> ><br>
> ><br>
> > =================================================<br>
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