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General control line discussion => Open Forum => Topic started by: Russell Bond on March 07, 2012, 08:35:02 PM

Title: Changing the CG for hot weather????
Post by: Russell Bond on March 07, 2012, 08:35:02 PM
On a normal type 700 square inch plane, do you need to change the CG position for hot weather compared to cold weather?
I know in hot weather you need to go up in pitch on the prop, but would you also need to change the CG?
Title: Re: Changing the CG for hot weather????
Post by: Howard Rush on March 07, 2012, 09:40:44 PM
No.
Title: Re: Changing the CG for hot weather????
Post by: Larry Fernandez on March 07, 2012, 10:07:55 PM
Quote from: Howard Rush on March 07, 2012, 09:40:44 PM
No.

Howdy Howard
On a very hot day at a Sacramento contest I found that the corners seemed a bit soft. So I opened up the line spacing on the handle a tad (another great option of the Fancher handle) and I found that the corners came back. Does this seem logical or was the improvment all in my head? Placeabo effect?

Serious question, as I have alway taken your word as well as the other west coast elitests as gospel when it comes to toy airplanes and trim techniques.

Larry, Buttafucco Stunt Team
Title: Re: Changing the CG for hot weather????
Post by: jim gilmore on March 07, 2012, 10:32:21 PM
there is less air density in hot weather so you may need more input. But c/g would not change.
Title: Re: Changing the CG for hot weather????
Post by: Russell Bond on March 07, 2012, 11:41:24 PM
OK, thanks for the replies.
I'm glad I don't have to alter the CG. 
Line spacing is easy to do. ;D
Title: Re: Changing the CG for hot weather????
Post by: Howard Rush on March 08, 2012, 12:30:22 AM
Quote from: jim gilmore on March 07, 2012, 10:32:21 PM
there is less air density in hot weather so you may need more input.

That's what I'd think.  You are fortunate to have had some corner to spare. 
Title: Re: Changing the CG for hot weather????
Post by: Steve Helmick on March 10, 2012, 01:33:36 PM
What about dialing out some elevator for higher density altitude? Is that something Experts normally move around to optimize through the season, or do you get it right for your normal weather and leave it alone?  ???