Matronics Email Lists :: View topic - 912S

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

912S - Flying in rain

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

sidsel.svein(at)oslo.onli
Guest

Posted: Tue Jun 08, 2010 8:13 am Post subject: 912S - Flying in rain

The current thread on combustion air, ram pressure, where to place the air intake, etc. brings up the issue of flying in rain with the Europa equipped with the 912S, having the air intake arranged as a NACA duct on top of the cowling and the plenum box just below the opening.  There are two 3.3 mm (1/8”) drain holes at the bottom of this plenum box, which will be able to drain away some water intake (you must fly with the ball in dead center for both to be effective).  A certain air pressure build-up in the plenum makes the drainage more effective.  

   

One theory I have heard goes as follows:  If the engine were stopped and surrounding air passed over the cowling at a speed of say 120 knots, very little rain would enter the air box.  The air would be backed up in the NACA duct and “new” air and rain drops would for the most part pass over it.  Given this starting scenario (the aircraft moving at a speed of 120 knots):  If you now have a running engine it will still not suck in so much combustion air that the velocity through the NACA duct is anywhere close to 120 knots + propeller slip stream velocity.  Air would therefore still be backed up in front of the plenum intake, with a certain amount of the air and rain drops flowing over the inlet.  

   

Theory and reality are two different matters also in this case.  What has been experienced when it comes to flying this configuration in rain (drizzle, light, heavy) – is it definitely to be avoided or is it more a matter of vertical and horizontal visibility?  

   

Regards,  

Svein  

LN-SKJ  

        [quote][b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

kevinmarie(at)blueyonder.
Guest

Posted: Tue Jun 08, 2010 8:50 am Post subject: 912S - Flying in rain

Dear All,  

   

I have a tri gear Europa Classic with a XS firewall forward setup and a 912ULS with a NACA on top of the cowling for the carbs. I have flown through very heavy rain, light rain etc (I am based in the UK)  with no problems.   

   

My rads oil & water are one behind the other with quite a gap at the bottom which lets air bypass the rads. The temps are fine and I have been as far south as Morocco with it in the summer and very hot conditions.  

   

I don’t often say anything on this forum as   

   

<![if !supportLists]>1.       <![endif]>I don’t understand the technical stuff.  

<![if !supportLists]>2.       <![endif]>I am too busy flying it.   

   

Kevin  

       

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Sidsel & Svein Johnsen

 Sent: 08 June 2010 17:13

 To: europa-list(at)matronics.com

 Subject: 912S - Flying in rain  

  

  

   

The current thread on combustion air, ram pressure, where to place the air intake, etc. brings up the issue of flying in rain with the Europa equipped with the 912S, having the air intake arranged as a NACA duct on top of the cowling and the plenum box just below the opening.  There are two 3.3 mm (1/8”) drain holes at the bottom of this plenum box, which will be able to drain away some water intake (you must fly with the ball in dead center for both to be effective).  A certain air pressure build-up in the plenum makes the drainage more effective.  

   

One theory I have heard goes as follows:  If the engine were stopped and surrounding air passed over the cowling at a speed of say 120 knots, very little rain would enter the air box.  The air would be backed up in the NACA duct and “new” air and rain drops would for the most part pass over it.  Given this starting scenario (the aircraft moving at a speed of 120 knots):  If you now have a running engine it will still not suck in so much combustion air that the velocity through the NACA duct is anywhere close to 120 knots + propeller slip stream velocity.  Air would therefore still be backed up in front of the plenum intake, with a certain amount of the air and rain drops flowing over the inlet.  

   

Theory and reality are two different matters also in this case.  What has been experienced when it comes to flying this configuration in rain (drizzle, light, heavy) – is it definitely to be avoided or is it more a matter of vertical and horizontal visibility?  

   

Regards,  

Svein  

LN-SKJ   	  Quote: 	
		    http://www.matronics.com/Navigator?Europa-List 	
0 	  Quote: 	
		   	
1 	  Quote: 	
		   	
2 	  Quote: 	
		   	
3 	  Quote: 	
		   	
4 	  Quote: 	
		   	
5 	  Quote: 	
		   	
6 	  Quote: 	
		   	
7 	  Quote: 	
		   	
8 	  Quote: 	
		   	
9

        [quote][b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

kheindl(at)msn.com
Guest

Posted: Tue Jun 08, 2010 8:54 am Post subject: 912S - Flying in rain

  

I have flown inthe rain with the standard setup, while rturning from Oshkosh. I didn't notice any problems. But normally I try to avoid it, because it isn't good for the propeller.

  

 Karl

 



  

  From: sidsel.svein(at)oslo.online.no

To: europa-list(at)matronics.com

Subject: 912S - Flying in rain

Date: Tue, 8 Jun 2010 18:13:07 +0200



  .ExternalClass p.ecxMsoNormal, .ExternalClass li.ecxMsoNormal, .ExternalClass div.ecxMsoNormal {margin-bottom:.0001pt;font-size:11.0pt;font-family:'Calibri','sans-serif';} .ExternalClass a:link, .ExternalClass span.ecxMsoHyperlink {color:blue;text-decoration:underline;} .ExternalClass a:visited, .ExternalClass span.ecxMsoHyperlinkFollowed {color:purple;text-decoration:underline;} .ExternalClass span.ecxEpostStil17 {font-family:'Calibri','sans-serif';color:windowtext;} .ExternalClass .ecxMsoChpDefault {font-size:10.0pt;} (at)page Section1 {size:612.0pt 792.0pt;} .ExternalClass div.ecxSection1 {page:Section1;}    

The current thread on combustion air, ram pressure, where to place the air intake, etc. brings up the issue of flying in rain with the Europa equipped with the 912S, having the air intake arranged as a NACA duct on top of the cowling and the plenum box just below the opening.  There are two 3.3 mm (1/8”) drain holes at the bottom of this plenum box, which will be able to drain away some water intake (you must fly with the ball in dead center for both to be effective).  A certain air pressure build-up in the plenum makes the drainage more effective. 

  

One theory I have heard goes as follows:  If the engine were stopped and surrounding air passed over the cowling at a speed of say 120 knots, very little rain would enter the air box.  The air would be backed up in the NACA duct and “new” air and rain drops would for the most part pass over it.  Given this starting scenario (the aircraft moving at a speed of 120 knots):  If you now have a running engine it will still not suck in so much combustion air that the velocity through the NACA duct is anywhere close to 120 knots + propeller slip stream velocity.  Air would therefore still be backed up in front of the plenum intake, with a certain amount of the air and rain drops flowing over the inlet. 

  

Theory and reality are two different matters also in this case.  What has been experienced when it comes to flying this configuration in rain (drizzle, light, heavy) – is it definitely to be avoided or is it more a matter of vertical and horizontal visibility? 

  

Regards, 

Svein 

LN-SKJ

[quote]



 	  Quote: 	
		  http://www.matronics.com/Navigator?Europa-List

ronics.com
	


ww.matronics.com/contribution



[b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

davidjoyce(at)doctors.org
Guest

Posted: Wed Jun 09, 2010 12:52 am Post subject: 912S - Flying in rain

Svein, Have flown with several groups of all sorts of Europas through rain 

over the years, and have not known anyone to have any problems with the 

engine system. Have heard but not experienced of propeller problems, and 

would usually deliberately reduce prop RPM if rain cannot be avoided. 

Regards, David Joyce, G-XSDJ

---

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum