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Twinstar Mk I weight & balance?

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ceengland7(at)gmail.com
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Posted: Sun Oct 22, 2017 12:07 pm Post subject: Twinstar Mk I weight & balance?

Getting ready to weigh the Twinstar. Anyone have a clue what part of the airframe can be leveled, to put it in flight attitude? On this one, leveling the top tube gives about 5 degrees positive AOA on the bottom of the airfoil. Does this sound about right for doing W&B? Was there ever a preferred datum point on these old planes?



Thanks,

Charlie

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gdhelton(at)gmail.com
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Posted: Sun Oct 22, 2017 12:29 pm Post subject: Twinstar Mk I weight & balance?

Charlie, I’m pretty sure the wings leading edge is the preferred datum. On a level surface the bottom of the wing should be set 8 or 9 degrees by raising or lowering the tail. It’s looking pretty nice in your picture. 

George H. 

Firestar, FS100

Mesick, Michigan 

gdhelton(at)gmail.com (gdhelton(at)gmail.com)



On Sun, Oct 22, 2017 at 4:10 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:



 	  Quote: 	
		  Getting ready to weigh the Twinstar. Anyone have a clue what part of the airframe can be leveled, to put it in flight attitude? On this one, leveling the top tube gives about 5 degrees positive AOA on the bottom of the airfoil. Does this sound about right for doing W&B? Was there ever a preferred datum point on these old planes?



Thanks,

Charlie



 	




-- 



Have a great day!

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ceengland7(at)gmail.com
Guest

Posted: Sun Oct 22, 2017 1:02 pm Post subject: Twinstar Mk I weight & balance?

Thanks, George; I appreciate it. 



My a&p buddy was guessing at 2-3 degrees of actual angle of attack, so I'll need to adjust a bit.



On Sun, Oct 22, 2017 at 3:28 PM, George Helton <gdhelton(at)gmail.com (gdhelton(at)gmail.com)> wrote:

 	  Quote: 	
		  Charlie, I’m pretty sure the wings leading edge is the preferred datum. On a level surface the bottom of the wing should be set 8 or 9 degrees by raising or lowering the tail. It’s looking pretty nice in your picture. 

George H. 

Firestar, FS100

Mesick, Michigan 

gdhelton(at)gmail.com (gdhelton(at)gmail.com)



On Sun, Oct 22, 2017 at 4:10 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:



 	  Quote: 	
		  Getting ready to weigh the Twinstar. Anyone have a clue what part of the airframe can be leveled, to put it in flight attitude? On this one, leveling the top tube gives about 5 degrees positive AOA on the bottom of the airfoil. Does this sound about right for doing W&B? Was there ever a preferred datum point on these old planes?



Thanks,

Charlie



 	




-- 



Have a great day!

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Oct 25, 2017 9:27 am Post subject: Twinstar Mk I weight & balance?

Charlie, Set the horizontal stabilizer level. As for datum, it doesn't matter as long as you're consistent with your measuring and you don't get minus and plus measurements if your datum is somewhere in the middle of the plane. I use a point 20 inches in front of the nose, that way all numbers are positive. You could just as easily make it 20 inches aft of the tail. It doesn't matter.



Rick Girard

  	          		Virus-free. www.avg.com 		 	 [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]



On Sun, Oct 22, 2017 at 4:01 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

 	  Quote: 	
		  Thanks, George; I appreciate it. 



My a&p buddy was guessing at 2-3 degrees of actual angle of attack, so I'll need to adjust a bit.



On Sun, Oct 22, 2017 at 3:28 PM, George Helton <gdhelton(at)gmail.com (gdhelton(at)gmail.com)> wrote:

 	  Quote: 	
		  Charlie, I’m pretty sure the wings leading edge is the preferred datum. On a level surface the bottom of the wing should be set 8 or 9 degrees by raising or lowering the tail. It’s looking pretty nice in your picture. 

George H. 

Firestar, FS100

Mesick, Michigan 

gdhelton(at)gmail.com (gdhelton(at)gmail.com)



On Sun, Oct 22, 2017 at 4:10 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:



 	  Quote: 	
		  Getting ready to weigh the Twinstar. Anyone have a clue what part of the airframe can be leveled, to put it in flight attitude? On this one, leveling the top tube gives about 5 degrees positive AOA on the bottom of the airfoil. Does this sound about right for doing W&B? Was there ever a preferred datum point on these old planes?



Thanks,

Charlie



 	




-- 



Have a great day!

 	


 



	




-- 

“Blessed are the cracked, for they shall let in the light.”   Groucho Marx

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