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Drag reduction

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Sat Sep 22, 2007 7:33 am Post subject: Drag reduction

Cheers,

	I have a nagging thought to offer. Having experienced the external

mods on a nymber of different machines, it occurred to me to mention that

one may want to have a confab with the designer concerning the change in

sidereal area of the mainwheel drag reduction. I intended to do that but

want to fly her basic first for comparison later.

	A number of ahead-of-CoG mods made a big difference in the spin

characteristics, partricularly after the third rotation - that's one

advantage of the Europa - a demonstrated 12-turn spin in each direction - a

rare event. Note the ventral strakes on an F16. These have been called Lawn

Darts in the past.

	We don't want someone trying to screw a EUPA into the back garden

from 13,000 feet. 

Ferg

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TELEDYNMCS(at)aol.com
Guest

Posted: Sun Sep 23, 2007 6:40 am Post subject: Drag reduction

In a message dated 9/23/2007 2:58:46 AM Eastern Daylight Time,  europa-list(at)matronics.com writes:

  	  Quote: 	
		  I believe the    biggest improvement in reducing drag would be found in the 

engine cowl    area.  Closing off the gills would be the first thing (they add 

no    value to the plane).  Second would be to clean up the radiator opening    

and following duct, it is too large for the size of this engine and is    

rather messy.  Then clean up the radiator exit, it is very messy back    there. 	
  

 Hi Terry,

  

 Or, you could install a Jab and do away with the radiator, gills and the  stock, stubby Europa cowl altogether.

  

 The 1800+ fpm climb rate I'm regularly seeing with my Jab is  nothing to sneeze at, nor is the $10,000 lower price over the 912S.

  

 Regards,

  

 John Lawton

 Whitwell, TN (TN89)

 N245E - 115 hours and going strong (and soon to be much faster,  too)

  

 Do Not Archive

 

  



See what's new="_blank">Make AOL Your Homepage.

  [quote][b]

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Sep 23, 2007 6:55 am Post subject: Drag reduction

John,



 	  Quote: 	
		   you could install a Jab and do away with the radiator, gills and the 

 stock, stubby Europa cowl altogether.


	


Of course an aircooled engine doesn't need a coolant radiator, but the 

cooling needs are about the same !

Due to aerodynamic and thermodynamic considerations, an air-cooled 

engine will always drag a little more than its liquid-cooled 

counterpart. That is provided the cooling installation is equallly well 

designed in both cases.

Concerning the Europa cowl, I agree with you it seems in need of some 

aerodynamical improvements 

 	  Quote: 	
		    

 The 1800+ fpm climb rate I'm regularly seeing with my Jab is nothing 

 to sneeze at, nor is the $10,000 lower price over the 912S.


	


Would you care to share any precise speed measurements (3 GPS runs, max 

take off weight, record of altitude, OAT, etc.) ?

My Jabiru buddies are getting soooo discreet when it comes to actual 

performance ;-(



Best regards,

-- 

Gilles

http://contrails.free.fr

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grahamsingleton(at)btinte
Guest

Posted: Sun Sep 23, 2007 7:23 am Post subject: Drag reduction

John

I have some friends in UK with a Jab 6 who are having cooling 

difficulties, would you like to copy me please when you reply to Gilles?

Graham



TELEDYNMCS(at)aol.com wrote:

 	  Quote: 	
		   In a message dated 9/23/2007 2:58:46 AM Eastern Daylight Time, 

 europa-list(at)matronics.com writes:

 

     /I believe the biggest improvement in reducing drag would be found

     in the

     engine cowl area.  Closing off the gills would be the first thing

     (they add

     no value to the plane).  Second would be to clean up the radiator

     opening

     and following duct, it is too large for the size of this engine and is

     rather messy.  Then clean up the radiator exit, it is very messy

     back there/.

 

  

 Hi Terry,

  

 Or, you could install a Jab and do away with the radiator, gills and the 

 stock, stubby Europa cowl altogether.

  

 The 1800+ fpm climb rate I'm regularly seeing with my Jab is nothing to 

 sneeze at, nor is the $10,000 lower price over the 912S.

  

 Regards,

  

 John Lawton

 Whitwell, TN (TN89)

 N245E - 115 hours and going strong (and soon to be much faster, too)

  

 Do Not Archive

  

 

 

 

 ------------------------------------------------------------------------

 See what's new="_blank">Make AOL Your Homepage.

 

 *

 

 

 *


	


-- 

Graham Singleton



Tel: +441629820187

Mob: +447739582005

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