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Ed Gray Engine

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michael.logan1(at)verizon
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Posted: Mon Feb 15, 2010 5:45 pm Post subject: Ed Gray Engine

Ed,



I would not shorten up your wings, especially if you are thinking of putting

the IV on floats.  Having a short wing reduces your gross weight and does

not give you much in increased top speed but you lose a lot of lift for

takeoff.



Mike Logan

Series 5 short wing

RAM EA81



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MichaelGibbs(at)cox.net
Guest

Posted: Mon Feb 15, 2010 11:15 pm Post subject: Ed Gray Engine

Mike sez (referring to a Model IV):



 	  Quote: 	
		  I would not shorten up your wings, especially if you are thinking of putting

the IV on floats.  Having a short wing reduces your gross weight and does

not give you much in increased top speed but you lose a lot of lift for

takeoff.


	


I cannot speak to the issue of short wings + floats but, on the Model 

IV, short wings do not affect gross weight.  Stall speed (an indirect 

indicator, I'll admit) was virtually the same on my IV, so I suspect 

the loss of lift is minimal as well.  That said, the longer wing may 

provide some advantage in ground effect when you are trying to 

unstick from the water.



Ed asks:



 	  Quote: 	
		  I want to make the outer wing bays removable to convert to a 

speedster on demand.  Has anyone done it...


	


I doubt it is worth the trouble although the implementation would be 

basically the same as done on the Series 5 "convertibles."



 	  Quote: 	
		  No. THREE  What other changes make a speedster wing?  Is it only the lower

surface baby ribs to maintain the airfoil of the ribs?


	


The "speedster" wing is set with less dihedral than the standard wing, too.



Mike G.

N728KF, Kitfox IV-1200 Speedster

Phoenix, AZ

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Tue Feb 16, 2010 2:18 pm Post subject: Ed Gray Engine

At 05:02 PM 2/15/2010, you wrote:

  	  Quote: 	
		  Query No. ONE  What engine is best for

 10k?  	


 A used 912 or 912s. These, with diligent application to Barnstormers and other media can be found. Not often, but they're out there. One of my flying buddies just replaced his S with a $7k unit off of a crashed aircraft. The engine had been gone through by a reliable mechanic and declared quite safe.



  	  Quote: 	
		  No. TWO   I want to make the outer wing bays removable to convert to a

 speedster on demand.  Has anyone done it, how is it done,  what diff. in

 performance? 	


 This has been done more than a few times. I've spoken to several who've done it and their preferences depended on their mission. Short wings gave more speed and higher roll rate, but higher take-off and landing speeds and rolls. Sleeving the spars is typical. I'd add that there is a requirement that you support all "end" ribs so the material shrink doesn't bow or break them, as is done currently for the outboard rib, and I'd use hinges to connect the two adjoining ribs, much as is currently done with cowls.



 My Number three, Ed, is to be careful not to reply to or quote in entirety a digest message. It sends the entire digest back to the list, which is cumbersome at best. Also be wary to change the title to suit your subject.



 Thanks,



 

 Guy Buchanan, Kitfox List Moderator

 San Diego, CA

 K-IV 1200 / 582-C / Warp / 400 hrs. and counting     [quote][b]

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

cmflyboy12(at)aol.com
Guest

Posted: Tue Feb 16, 2010 7:09 pm Post subject: Ed Gray Engine

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