Composite-ARF IMPACT question

[Grow Pattern]

The only discussion that I am/was aware of is the one about some fin-seams 
needing re-aligning, and that was on RCU.

Mine looks good. The up and down lines are rudder trim free. I hope to 
complete number 2 when I get back from Myrtle Beach.  Flight testing will be 
the proof of the pudding :-)

Eric.


----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, March 28, 2005 10:51 PM
Subject: Re: Composite-ARF IMPACT question


> 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.
>>
>>
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