[NSRCA-dist8] [External] Re: FW: Pattern plane

[J N Hiller]

No problem Karl. Yes there are several ways to find the CG and I've used them all but that is only a starting point.

All airplanes need flight trimming and that's a whole different world with a lot of personal preferences.

Jim

 

From: NSRCA-dist8 [mailto:nsrca-dist8-bounces at lists.nsrca.org] On Behalf Of Karl Watts via NSRCA-dist8
Sent: Monday, August 24, 2020 9:26 AM
To: RICHARD BERGERON; AK, ID, MT, OR, WA, WY
Subject: Re: [NSRCA-dist8] [External] Re: FW: Pattern plane

 

Wow, you guys know your stuff!  Using Alan's and Rick's (50%) methods I get the same CG, and that is just ¼ inch ahead of the CG from a CG calculator sent to me by Bruce Tharpe (thanks to Sean).  Sorry Jim, not enough motivation to use your method after the above results.  Thanks guys!  Will let you know how the maiden flight goes.

 

Karl

From: RICHARD BERGERON <ribergeron at comcast.net> 
Sent: Sunday, August 23, 2020 5:50 PM
To: Karl Watts <Karl.Watts at saintalphonsus.org>; AK, ID, MT, OR, WA, WY <nsrca-dist8 at lists.nsrca.org>
Subject: [External] Re: [NSRCA-dist8] FW: Pattern plane

 

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Hi Karl, 

 

The control throws at 8 degrees and 10 degrees are a good start for the aileron and elevator. The CG at 1/3rd back from the leading edge at the fuse is way to far forward for a start. That would make it too tail heavy which would be a challenge.  Try 45% back from the leading edge and it might need to go more than that after some trim flights. Some of the old pattern planes ended up around 50% to 55% from the leading edge. 

 

Good to hear your flying something. Good luck. 

 

Rick Bergeron 

 

RCA-dist8 <nsrca-dist8 at lists.nsrca.org> wrote: 

 

 

I friend gave me this nice classic pattern plane.  In really good shape, composite fuse, foam core wings, OS FS-120 surpass that still runs strong.  Anyone familiar with it?  Need to know where to set the CG.  1/3rd back from the leading edge at the fuse?  Good starting point for control throws, 8 degrees on aileron and 10 degrees on elevator?

 

Egad, the smoke from the forest fires here is bad today!  Went out to the field and just turned around to come home, visibility low.

 

Karl

 

From: Karl Watts <Karl.Watts at saintalphonsus.org> 
Sent: Saturday, August 22, 2020 1:32 PM
To: Karl Watts <Karl.Watts at saintalphonsus.org>
Subject: Pattern plane

 

 

 

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