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Automatic upper cowl flap
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longg(at)pjm.com
Guest

Posted: Mon Jul 02, 2007 11:23 am Post subject: Automatic upper cowl flap

This concept has been used in green houses for years. Yes, I suppose

ceiling windows are kind of like cowl flaps. Those motors are huge and

could not be used, but the concept is the same. Perhaps a green house

dealer would be a good source for the sensor/switch. 



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earl_schroeder(at)juno.co
Guest

Posted: Mon Jul 02, 2007 12:39 pm Post subject: Automatic upper cowl flap

Try any junk Volkswagen engine [the air cooled version]They all have a

bellows in the lower right side easily removed and adapted to your

purpose.  Tony Bingelis wrote articles about this approach in EAA

magazines and in his own publications.  Earl

---------

Carlos wrote:

 where do you think I can get that "miraculous" bimetal spring?

Are those "calibrated" for the temperature we want it to actuate?



Carlos

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Bill Schlatterer

Joined: 09 Jan 2006
Posts: 195

Posted: Mon Jul 02, 2007 3:38 pm Post subject: Automatic upper cowl flap

 	  Quote: 	
		  >  "Get you a temperature bellows off of a VW engine.  Sorry I don't know

the proper name.  It expands when it gets hot, which it shouldn't do while
	


you're flying due to the airflow.  But it will during post-flight taxi if

you rig it so that the expansion opens the hinged door that Charlie

suggests.  Once the engine cools, it will contract to close the door again.

"



For a full description of the suggestion above, see pages 140, 141, 142, and

143 of Tony Bingelis book,...Firewall Forward.  There are complete line

drawings, temp and bellows extension lengths, linkage design, etc.  Very

informative and very simple,... almost elegant  



Bill S

7a Ark -  not yet flying  



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Bill Schlatterer

Joined: 09 Jan 2006
Posts: 195

Posted: Mon Jul 02, 2007 4:10 pm Post subject: Automatic upper cowl flap

OK, here is a teaser.  This is one of the Bengilis pages (P141) showing one

of the cowl flap actuator bellows.



Bill S 



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lm4(at)juno.com
Guest

Posted: Tue Jul 03, 2007 5:45 am Post subject: Automatic upper cowl flap

Well Carlos,

        I've been trying to find the Tony Bengelis solution. But havn't

found it yet. I think he said it was a air plunger that operates a door

on a Volkswagen. They use it as a sort of cowl flap. Tony used it as a

real cowl flap. When the engine room gets hot the air in the cylinder

gets hot and expands in the chamber and pushes the cylinder rod out. The

rod pushes the flap open.

HTH 

Larry Mac Donald

lm4(at)juno.com

Rochester N.Y.

Do not archive



On Mon, 2 Jul 2007 19:40:43 +0100 "Carlos Trigo" <trigo(at)mail.telepac.pt>

writes:

 	  Quote: 	
		   

 <trigo(at)mail.telepac.pt>

 

 Thanks Glenn

 

 That is really a very clever solution.

 

 And where do you think I can get that "miraculous" bimetal spring?

 Are those "calibrated" for the temperature we want it to actuate?

 

 Carlos

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lm4(at)juno.com
Guest

Posted: Tue Jul 03, 2007 6:13 am Post subject: Automatic upper cowl flap

Carlos,

        I've found it.

Firewall forward by Tony--Page 141 shows the "VW or Porsche air intake

housing bellows" and measurments. Page 142 shows a picture of how it is

hooked up. It even has an manual over-ride and a flap position indicator.

Larry Mac Donald

lm4(at)juno.com

Rochester N.Y.

Do not archive



On Sun, 1 Jul 2007 18:20:31 +0100 "Carlos Trigo" <trigo(at)mail.telepac.pt>

writes:

 	  Quote: 	
		   

 <trigo(at)mail.telepac.pt>

 

 Since I'm using a Subaru engine, I need to have some 

kind of  ventilation exit on the upper cowling, to dissipate 
	


heat after engine shutdown.  Most builders just make a 

row of 3/4" holes, and others put side louvers  that look 

like shark guilds.I intend to make the upper row of holes, 

but don't want to let them  always open, due to the 

possibility of rain penetration and also because  they 

canhave a bad influence in the cooling air flow inside the 

cowling.Therefore I thought of a small (some 15" x 1 1/2") 

moving flap, which covers the holes, and is normally 

closed in flight.Now the electrical challenge, that I put 

here to the smart guys of  this list: The ideal solution to 

maneuver this flap would be to automatically  open it

 when the engine is turned off, which in this engine's 

case is to  turn Off an  electrical switch.

 How can it be done?

 Carlos

 RV-9A

 P.S. - I know this is not a KIS solution...

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trigo(at)mail.telepac.pt
Guest

Posted: Tue Jul 03, 2007 11:17 am Post subject: Automatic upper cowl flap

Thanks Larry



Another fellow lister ( Bill S ) already sent me a scan of those pages from 

Tony Bingelis' book.

Thanks to everybody who responded.



Carlos

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hooverra(at)verizon.net
Guest

Posted: Tue Jul 03, 2007 5:02 pm Post subject: Automatic upper cowl flap

Here is one source of the VW Temperature control Bellows.

 [img]cid:part1.03040601.09050902(at)verizon.net[/img]

 http://www.bugcity.com/cgi-bin/WebStore/indexNEW.cgi/mi=yes/srchcd=111119159AX 

  	  Quote: 	
		  -- 

Ralph C. Hoover

RV7A 

hooverra at verizon dot net

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