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SIG something extra CG Point - 4/17/2009 7:59 PM   
navydon


 

Posts: 3
Score: 100
Joined: 5/16/2008
Last Login: 6/5/2010
From: St. Augustine, FL, USA
Status: offline 		I have just built a something extra, and forgot to put on the tail. I intend to fly it as a tailess. My question is with a symetrical airfoil, where would you suggest I put the CG for the first flight? Also how much up aileron/elevator would be needed to counter the loss of tail lift?

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RE: SIG something extra CG Point - 4/20/2009 6:06 PM   
Deadeye



Posts: 4515
Score: 119
Joined: 7/17/2002
Last Login: 5/23/2013
From: Dutton, MT, USA
Status: offline 		How can you fly it without tail feathers? My SSE balances about 1/2 inch behind the main spar, but it is set up for 3D.

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RE: SIG something extra CG Point - 11/14/2012 5:43 AM   
PA441914


 

Posts: 6
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Joined: 11/14/2012
Last Login: 3/21/2013
From: Saskatoon, Saskatchewan, SK, CANADA
Status: offline 		it wont happen. thats why orville and wilbur had a rudder. without a vert stabilizer. you just made a frisbee.

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RE: SIG something extra CG Point - 11/14/2012 11:55 AM   
Iron Bottom


 

Posts: 66
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Joined: 1/30/2004
Last Login: 5/24/2013
From: Butner, NC,
Status: offline 		I built a Bill Evans tailless once upon a time. Assuming you have a vertical stabilizer, I would start with about 1/8 up on the ailerons. It might fly, but the wing on mine was a lot different from a symmetrical wing. Odd leading edge and reflexed trailing edge. I don't remember where the CG was positioned. Really nice flying, but refused to do an outside loop. You'll need an elevator/aileron mix to fly without a stabilizer.

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