Composite-ARF IMPACT question

[Lance Van Nostrand]

Eric,
Glad the plane is a winner.  I'm curious about something.

A while back there was a thread on this plane that discussed a bit of a 
bannana bow in the fuse.  I assume yours has this, like the others, and it 
is inconsquential.  right?

My curiosity on this stems from an even earlier thread about how flat a 
table you need to make wings and how much wing bow is too much.  From what I 
remember, the conclusion was that if you can't use your wing trailing edge 
as a reference line for laser optics than you are doing something wrong.

This struck me as funny since I've flown some excellent planes that had some 
wing warp and am of the radical opinion that there is a true error band 
where a little wing bow (I'm talking maybe 1/8" over 32") is unnoticeable. 
Yes, it is measureable but if no one can tell the difference than No flatter 
is not inherently better.  There's always a point on the way to perfection 
that we consider as good enough and another point where we say that our 
tools will not allow us to measure any smaller deviations.  They are not 
necessarily the same point!

I've never done an engineering study but I would love to know when the 
wing/fuse is straight enough, so that after that point I am only pursuing 
the perfection of the craft, or to impress my friends, or to see if I can, 
or whatever.

--Lance

----- Original Message ----- 
From: "Grow Pattern" <pattern4u at comcast.net>
To: <discussion at nsrca.org>
Sent: Sunday, March 27, 2005 5:46 PM
Subject: Composite-ARF IMPACT


> Yesterday was good enough for testing pattern planes in southern NJ.
>
> I am pleased to report that if you have not yet flown your new IMPACT  you 
> should be pleasantly surprised.
>
> I was delighted with mine from the moment it left the ground. It took a 
> while to program the OS mixture carb due to the cooler temperatures and a 
> new liner and piston/ring.
>
> After the first flight the only mix that I could see that will be needed 
> will be a tiny bit of  roll correction in one direction. After a 
> length-of-the-field knife-edge KE test you could get about 1/4 of a roll 
> in the opposite direction to the right rudder input. There was no elevator 
> trim required at all.
>
> Thanks to a first class incidence-setting job by George Asteris the plane 
> flew great from the outset. Some planes just feel right as they leave the 
> ground. This is one of them. Thanks to all of the throw-setting advice in 
> the thread there was no real need to change anything. Spins were solid 
> with rudder and elevator only, The 2-turn reverse was as good as the 
> pilot's timing.
>
> Because it is an IMPACT with top ailerons it has the signature Pterodactyl 
> "screech!" when you snap. You just add your own "whooping!"....
>
> Regards,
>
> Eric.
>
>
> =================================================
> To access the email archives for this list, go to
> http://lists.f3a.us/pipermail/nsrca-discussion/
> To be removed from this list, go to http://www.nsrca.org/discussionA.htm
> and follow the instructions.
>
> List members email returned for mailbox full will be removed from the 
> list.
> 

=================================================
To access the email archives for this list, go to
http://lists.f3a.us/pipermail/nsrca-discussion/
To be removed from this list, go to http://www.nsrca.org/discussionA.htm
and follow the instructions.

List members email returned for mailbox full will be removed from the list.