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Car Gas/turbins

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cjpilot710(at)aol.com
Guest

Posted: Tue Nov 27, 2007 8:20 pm Post subject: Car Gas/turbins

It is interesting how changing an aircraft shape, even slightly, can big  effects on its handling or even its controllability.  Almost 20 years ago,  I was playing at being a designer.  I was working on an idea for a  composite 80% scale Spitfire.  When the weight/balance didn't come out  (very tail heavy) I thought about extending the nose (along with the engine and  anything else I could).  When I looked at it, the profile just didn't  "right".  I asked Bill Welsh (a very respected aero dynamist at the  time now passed away) to look at it.  He came back with the definitive  answer.  DON'T DO IT!  The extended nose would have turn the "normally  docile" Spitfire into a uncontrollable night mare.  For much the same  reason a lot of float planes have extra fins on the tail, to offset the area  added ahead of the center of pressure.

  

 I willing to bet that the lighter weight turbine engine would need to be  moved forward to help weight and balance, and a some point you will increase the  arm of the area ahead of the center of pressure.  Hence the ventral fin on  the T-34C as compared to the As&Bs.  How this would effect the CJ I  don't know.  Most CJ are fairly nose heavy with all the radios removed from  aft of the rear cockpit and normally ballast is required in the tail.  It  might be fun to run the numbers, draw up a profile, to see what she might look  like.  In 2001 when Bushi was asked by one of the AZ guys about that,  he told them it would be better to design a whole new airplane.  Still  - - - - -

  

 Jim "Pappy" Goolsby 

  

  

  

  In a message dated 11/27/2007 8:56:23 P.M. Eastern Standard Time,  N13472(at)aol.com writes:

  	  Quote: 	
		        In a message dated 11/26/2007 9:08:44 P.M. Pacific Standard Time,    cjpilot710(at)aol.com writes:

    	  Quote: 	
		       Does the T-34C have the same airfoil and wing?

      

     Jim "Pappy" Goolsby

	


   

   Speaking of fun turbine air planes I have a neighbor that has a L-17    (Navion) with the Walter 750 Hp on

   the nose. Although it looks strange the distances from the spar to the    tip of the spinner is the same as

   spar to tip of the tail.       

   Tom Elliott    

CJ-6 NX63727

Sandy Valley    NV

3L2

702-723-1223





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://www.matronics.com/contribution">http://www.matronics.com/contribution

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.matronics.com/">http://forums.matronics.com



	
	




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viperdoc(at)mindspring.co
Guest

Posted: Tue Nov 27, 2007 9:33 pm Post subject: Car Gas/turbins

.  In 2001 when Bushi was asked by one of the AZ guys about that, he told them it would be better to design a whole new airplane.  Still - - - - -  

    

   

    

Jim "Pappy" Goolsby   

   

Hmmm….Design a whole new airplane….novel idea! [img]cid:image001.jpg(at)01C8314D.A9B78A80[/img]  

   

:>0   ;>))  

   

Doc  

    

   

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cjpilot710(at)aol.com
Guest

Posted: Wed Nov 28, 2007 6:07 am Post subject: Car Gas/turbins

Yep,

  

 You see before you a real life Yak 18A.    

  

 But its all fabric covered!  

  

 And it has a steel tube frame.  

  

 Look! all the stabilizers are externally braced and covered with  fabric

  

 And that airfoil - - why its the old Clark Y!  

  

 And there is that landing gear, stuck out in the breeze.  Will keep  you from going passed Vne to quickly. That's good. And, Yep its great for  the gear up landings these guys are so good at!  

  

 Geee the engine is only 260 hp (Must be pretty doggy).  How come the  CJ-6 was so much faster with the same engine?

  

 That center section?  Wonder where they got the from?  Maybe the  Junkers A50 (1929) or even the Fokker DVIII (It is a monoplane with a center section -  just on top is all.  And it had a round engine) 

  

 Geee it looks like a Yak 52 (with a center section) to me.

  

  

 Hay!  You've pulled my chain!  I out of here for a while   :>)

  

  

 Jim "Pappy" Goolsby

  

  "There is nothing NEW under the sun, son"  My father a long time  ago.

 "Form follows function"  Some astute engineer a long time  ago. 



   

  

  In a message dated 11/28/2007 12:34:27 A.M. Eastern Standard Time,  viperdoc(at)mindspring.com writes:

  	  Quote: 	
		        

       

.  In    2001 when Bushi was asked by one of the AZ guys about that, he told them it    would be better to design a whole new airplane.  Still - - - -    -

      

 

      

Jim    "Pappy" Goolsby    

    

Hmmmâ€¦.Design    a whole new airplaneâ€¦.novel idea!    

    

:>0      ;>))   

    

Doc

      

 

 	  Quote: 	
		   	


	




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