You put the CG where the designer says it should be and then adjust the model to fly without stalling or diving. If you're doing your own design then you skip the first step and go to the second step. If the model will not fly without stalling or diving then you move the CG forward and try again. Gliding the model without the motor will possibly get you in the ballpark for a low power first flight but you have to realize that the motor changes the CG. For instance, on LittleSquare the recommended CG without the motor is 3/4" in front of the TE of the wing. With a 2 gram motor on the model the CG moves to 1/4" behind the TE of the wing. I think if you are going to set up the decalage by glide testing then you should put a 2 gram weight (clay, etc.) centered between the front and rear hooks.
----- Original Message -----
From: brantfredrickson
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, November 15, 2006 11:03 AM
Subject: [Indoor_Construction] 2007 SO decalage
Our current method of setting decalage is to run the model into the
ceiling and then watching to see if it takes a nose dive. It doesn't
especially seem to be a good way to set the decalage. So at home we
adjusted the wing and stab incidence until the model, when glided
without the rubber motor, recoverd in about six feet of height. What
do other people do?
Brant
[Non-text portions of this message have been removed]
Received on Wed Nov 15 2006 - 08:29:54 CET
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