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Cowling mods

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frans(at)paardnatuurlijk.
Guest

Posted: Mon Mar 02, 2009 12:55 pm Post subject: Cowling mods

Fred Klein wrote:



 	  Quote: 	
		   Frans...this sounds really interesting...cheers for getting rid of the

 dog house...how bout some photos?


	


I guess more people are interested in seeing some preliminary work that

has been done.

Note that a lot of work still needs to be done. It is a sort of

"concept" that is ready now.



The idea is to reduce drag, and improve cooling at the same time.



Picture 1: the nasa-ducts in the top cowling. Inside is a deflector

screen. The air is aimed between the front and read cylinders, cooling

both efficiently and equally. The air is directed to the bottom, so the

heated air will hopefully not collect in the top cowling. The air

outlets (inlets?) on the side are closed off. If the engine is shut off,

the remaining heat will find its way out via the nasa ducts which are

actually higher than the side vents.

Note that the front openings will be used for taxi & landing lights, and

not as an air passage.



Picture 2: the cooling inlet and diffuser for the radiators. The idea is

here that the frontal area is reduced, the air inlet is in a better

position in the propellor wash (important for cooling on the ground!),

and drag is lowered because of the diffuser in front of the radiators.

The area where the original air duct was, has been filled with blue

foam, and then sanded until it had the shape the cowling should have. A

few layers of bid (inside and outside) to make it strong. Some (a lot?)

of filler is required to finalize it. The diffuser is also made from

blue foam, shaped, and with two layers of bid.



Picture 3: closeup of the diffuser. The area inside is funnel shaped

with a round curve, but that is hard to see. Every wall of the diffuser

can be seen as a wing. The air going inside is slowed down by expansion,

to match with the airflow the radiators can handle.



Picture 4: Underside/rearside of the radiator housing.

What you are seeing here are actually two air outlets: The opening for

the radiators is obvious. Directly behind it (towards the camera) is the

opening from the engine bay. Both radiators are in line with each other:

the oil radiator will only get air that has gone through the water

radiator. I believe that this is a good thing. (The reason that this is

sometimes done differently in the Europa is because of the bad

properties of the original cooling duct).

On the bottom panel you can see a hinge. Here will be attached an

adjustable cowl flap. In the cruise position, it will be in a direct

line with the bottom panel of the radiator housing. It will extend

considerably rearward, where the belly slopes down. The outgoing air

will be speed up, and hopefully smootlly mix with the air passing the

radiator housing because it has the same speed and direction. If more

cooling is required, the flap will move down, making a greater opening,

and causing some vacuum behind the flap to help the air out. Obviously,

in maximum cooling position it will create some drag, although it

wouldn't be worse than the factory cowling.

Note that the sides of the radiator housing will not be visible when the

cowling is finished, as it will overlap the sides of the radiator

housing. (Problem here of course is that the radiator housing is fixed

to the fuselage, while the bottom cowling needs to be removable. Am not

sure yet where exactly the seam will be made).



Picture 6: Here the shape is better to see. If the cowl flap is in

place, it will be in a direct line with the radiator housing, horizontal

with the flight direction. Because the belly of the cowling slopes down,

the air going to the exit will be compressed (read: "speed up") somewhat.

The complete air path is as follows: There is a small opening in front,

and behind the opening is a diffuser which has "wing-shaped" walls that

increase the area, thus slowing the air down. The slower moving air can

pass the radiators, and after that the air is speed up again, so when

the air is released, it has the same direction and speed as the

surrounding air.



Of course, al this is theory. Because the cooling properties of the

factory cowling are so bad, I believe that it would actually be

difficult to make it worse. So chances are that my cooling at least

gives some better cooling and aerodynamics.



Note that before I started with the Europa I had no experience at all

with making shapes and working with epoxy. I'm sure that a lot of people

can do a better job than I did, and I'm not really sure how things will

look after applying filler and sanding. I hope it is going to be ok.



Comments are welcome of course!



-- 

Frans Veldman

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patkinson

Joined: 26 Jun 2007
Posts: 15

Posted: Tue Mar 03, 2009 6:49 am Post subject: Cowling mods

Frans



You may be interested to know that Europa did some testing of several duct

positions with a view to producing a mod along the lines of what you are

doing. The aim being to improve cooling, reduce drag and improve the looks.

Unfortunately it never got produced  

I spoke to Andy Draper today and he is going to send me a drawing of the

design that worked the best in terms of cooling. I will happily forward it

to you when I get it.

Regards



Paul Atkinson



--

jeff(at)rmmm.net
Guest

Posted: Tue Mar 03, 2009 7:07 am Post subject: Cowling mods

Paul,

Forward those to all of us as I'm too interested in seeing them.

Regards,



Jeff R.

A258 - N128LJ / Gold Rush 176 hours down for annual & Mods.

On Mar 3, 2009, at 8:46 AM, Paul Atkinson wrote:



[quote] 

 <paullatkinson(at)talktalk.net>



 Frans



 You may be interested to know that Europa did some testing of several 

 duct

 positions with a view to producing a mod along the lines of what you 

 are

 doing. The aim being to improve cooling, reduce drag and improve the 

 looks.

 Unfortunately it never got produced 

 I spoke to Andy Draper today and he is going to send me a drawing of 

 the

 design that worked the best in terms of cooling. I will happily 

 forward it

 to you when I get it.

 Regards



 Paul Atkinson



 --

grahamsingleton(at)btinte
Guest

Posted: Tue Mar 03, 2009 7:11 am Post subject: Cowling mods

Paul Atkinson wrote:

 	  Quote: 	
		   



 Frans



 You may be interested to know that Europa did some testing of several duct

 positions with a view to producing a mod along the lines of what you are

 doing. The aim being to improve cooling, reduce drag and improve the looks.

 Unfortunately it never got produced  

 I spoke to Andy Draper today and he is going to send me a drawing of the

 design that worked the best in terms of cooling. I will happily forward it

 to you when I get it.

 Regards



 Paul Atkinson

   

Paul
	


I'd like to see those too please

Graham

rlborger(at)mac.com
Guest

Posted: Tue Mar 03, 2009 9:29 am Post subject: Cowling mods

Paul,



Please post on the Europa Owners site for all to access.



Bob



Sent from my iPhone



On Mar 3, 2009, at 8:46, Paul Atkinson <paullatkinson(at)talktalk.net>  

wrote:



[quote] 

 >



 Frans



 You may be interested to know that Europa did some testing of  

 several duct

 positions with a view to producing a mod along the lines of what you  

 are

 doing. The aim being to improve cooling, reduce drag and improve the  

 looks.

 Unfortunately it never got produced 

 I spoke to Andy Draper today and he is going to send me a drawing of  

 the

 design that worked the best in terms of cooling. I will happily  

 forward it

 to you when I get it.

 Regards



 Paul Atkinson



 --

g-iani(at)ntlworld.com
Guest

Posted: Tue Mar 03, 2009 10:41 am Post subject: Cowling mods

Paul



Obviously everyone is interested in the cowl drawings.  Do you know if Andy

is going to send paper or a CAD drawing?



If its paper, I will on behalf of the Club, be happy to digitise it and make

available in a suitable format everyone can use (PDF, JPG etc)



If it is CAD again I am happy to translate it into a usable format.



Ian Rickard G-IANI XS Trigear, 200 hours

Europa Club Mods Rep (Trigear)

e-mail mods(at)europaclub.org.uk   

   or direct g-iani(at)ntlworld.com

grahamsingleton(at)btinte
Guest

Posted: Tue Mar 03, 2009 12:03 pm Post subject: Cowling mods

G-IANI wrote:

 	  Quote: 	
		   



  

 Paul

 If it is CAD again I am happy to translate it into a usable format.

***.dxf should be OK
	


Graham

jrgowing(at)bigpond.net.a
Guest

Posted: Tue Mar 03, 2009 3:03 pm Post subject: Cowling mods

Paul



I  hope you post it for everyone to see!



JR (Bob) Gowing 327 in Oz

do not archive

---

patkinson

Joined: 26 Jun 2007
Posts: 15

Posted: Wed Mar 04, 2009 1:56 am Post subject: Cowling mods

To all who have asked for the cowling drawing.

I think Andy is planning to send it to me by email but I do not know what

format it is in. I will of course make it available to everyone, if possible

as an attachment to an email.

 	  Quote: 	
		  From what Andy told me it sounds as though Frans has come up with a design

very similar to the Europa one. 
	


I am wearing my rose tinted spectacles at the moment but it does seem to be

such a good idea that Europa ought to consider taking this on once again.



Paul Atkinson

g-iani(at)ntlworld.com
Guest

Posted: Wed Mar 04, 2009 4:13 am Post subject: Cowling mods

 	  Quote: 	
		  From the conversations I have had with David Stanbridge I am aware that

revising the cowl is one item on his agenda of possible Europa improvements.
	


I do not know if he has had the information as to what has already been done

by Andy.



David does monitor this forum but, in case he misses it, I will pass on

anything useful to him.



Ian Rickard G-IANI XS Trigear, 200 hours

Europa Club Mods Rep (Trigear)

e-mail mods(at)europaclub.org.uk   

   or direct g-iani(at)ntlworld.com

patkinson

Joined: 26 Jun 2007
Posts: 15

Posted: Wed Mar 04, 2009 6:56 am Post subject: Cowling mods

That is good news. Andy is not sure what info is still with Europa but he

still has some if not all of it on his hard drive and would make it

available to Europa if needed. He also said that the improvement in cooling

was significant but couldn't remember any numbers. The testing was a series

of ground runs on a Yorkshire summer day so possibly not very hot! But a

steady state was reached within limits.

The drawing the he offered me is a CAD one but he is going to email me a

scanned version when he gets a spare minute.



Paul Atkinson



--

patkinson

Joined: 26 Jun 2007
Posts: 15

Posted: Wed Mar 04, 2009 12:07 pm Post subject: Cowling mods

All 

Here is the promised drawing. Andy has also sent a copy to Roger Bull.



Paul Atkinson



--

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ploucandco

Joined: 16 Sep 2007
Posts: 69

Posted: Sat Jul 11, 2009 12:29 pm Post subject: Re: Cowling mods

Hi all,



Has someone already implemented or has plans to implement this mod on the lower cowling?



With more than 30C over here in summer, getting out of the yellow for both CHT and oil Temperature of my 914 is a real challenge when flying circuits or not far from the airfield!



Jacques.

kheindl(at)msn.com
Guest

Posted: Sat Jul 11, 2009 2:04 pm Post subject: Cowling mods

  

Jacques C

  

 Which mods are you referring to ?

 I have made mods but have not tested them yet.

  

 Karl

 



  

[quote] Subject: Re: Cowling mods

 From: ploucandco(at)YAHOO.COM

 Date: Sat C 11 Jul 2009 13:29:16 -0700

 To: europa-list(at)matronics.com

 

 --> Europa-List message posted by: "ploucandco" <ploucandco(at)yahoo.com>

 

 Hi all C

 

 Has someone already implemented or has plans to implement this mod on the lower cowling?

 

 With more than 30C over here in summer C getting out of the yellow for both CHT and oil Temperature of my 914 is a real challenge when flying circuits or not far from the airfield!

 

 Jacques.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=252584#252584

 

 

 

 

 

 

 > 

 

 

   	  Quote: 	
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