Matronics Email Lists :: View topic - Aircraft angle of Incidence in flight and engine cooling

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

Aircraft angle of Incidence in flight and engine cooling

Matronics Email Lists Forum Index -> Zenith-List

View previous topic :: View next topic

Author Message

jeffrey-j-paris(at)excite
Guest

Posted: Sun Jun 26, 2011 2:20 pm Post subject: Aircraft angle of Incidence in flight and engine cooling

Wizards!

   

  Question:  Could the angle of incidence in flight effect the ability of an engine to cool?  I ask this because, I truly believe that I have my Bing Carb dialed in as far as EGTs, but in cruise I still have pesky CHT issues on cylinder 2,3,4 and #4 is always in the 315F range.  In a sustained climb I, things head for toast quickly!

   

  When we purchased our FWF kit from Jabiru USA early version, we figured that they had everything figured out.  Obviously, in my case although we followed the install instructions to a tee, we still are playing with all things engine and cowl.  In terms of the angle of incidence, my friend and I went flying the other day  and he took a picture of me and I believe it looks as if that when in cruise my nose of the aircraft is up, which might account for some sort of impeded airflow into the cowl.  I'm asking this question, becasue when we all obviously point the nose down in descent we get better airrflow and CHT's tend to come down.

   

  Any thoughts on this matter.

   

  CAVU,

   

  Jeff Paris Ni196ZP Jab 3300 Ch601XLB  N127ZP Jab 3300 Eurpoa Monowheel in drydock

   

 [quote][b]

- The Matronics Zenith-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?Zenith-List

Afterfxllc(at)aol.com
Guest

Posted: Sun Jun 26, 2011 2:34 pm Post subject: Aircraft angle of Incidence in flight and engine cooling

If it were a properly designed engine it wouldn't matter but being it is a  Jab anything is possible. 

 I won't touch a Jab 3300 in my shop other than to install water cooled  heads on one because anything else IMHO is a waste of time.

  

  In a message dated 6/26/2011 6:21:43 P.M. Eastern Daylight Time,  jeffrey-j-paris(at)excite.com writes:

  	  Quote: 	
		     Wizards!

    

   Question:  Could the angle of incidence in flight effect the ability    of an engine to cool?  I ask this because, I truly believe that I have my    Bing Carb dialed in as far as EGTs, but in cruise I still have pesky CHT    issues on cylinder 2,3,4 and #4 is always in the 315F range.  In a    sustained climb I, things head for toast quickly!

    

   When we purchased our FWF kit from Jabiru USA early version, we figured    that they had everything figured out.  Obviously, in my case although we    followed the install instructions to a tee, we still are playing with all    things engine and cowl.  In terms of the angle of incidence, my friend    and I went flying the other day  and he took a picture of me and I    believe it looks as if that when in cruise my nose of the aircraft is up,    which might account for some sort of impeded airflow into the cowl.  I'm    asking this question, becasue when we all obviously point the nose down in    descent we get better airrflow and CHT's tend to come down.

    

   Any thoughts on this matter.

    

   CAVU,

    

   Jeff Paris Ni196ZP Jab 3300 Ch601XLB  N127ZP Jab 3300 Eurpoa    Monowheel in drydock

    

 	  Quote: 	
		  



ef="http://www.matronics.com/Navigator?Zenith-List">http://www.matronics.com/Navigator?Zenith-List

s.matronics.com/">http://forums.matronics.com

p://www.matronics.com/contribution">http://www.matronics.com/contribution



	
	


 [quote][b]

- The Matronics Zenith-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?Zenith-List

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Jun 26, 2011 2:55 pm Post subject: Aircraft angle of Incidence in flight and engine cooling

Make sure that the outlet from the cowl is at least 1 1/2 times the area of the inlet. Put a lip ahead of the outlet to create a low pressure area to pull the air out of the cowl. The best way to keep the engine cool is to make sure the heated air can get OUT of the cowl. Also make sure the baffling is tight inside the cowl, you have to make sure the cooling air is directed to where it needs to go and can't leak around the baffling.

On Jun 26, 2011, at 6:16 PM, Jeffrey J Paris wrote:



 	  Quote: 	
		   Wizards!

  

 Question:  Could the angle of incidence in flight effect the ability of an engine to cool?  I ask this because, I truly believe that I have my Bing Carb dialed in as far as EGTs, but in cruise I still have pesky CHT issues on cylinder 2,3,4 and #4 is always in the 315F range.  In a sustained climb I, things head for toast quickly!

  

 When we purchased our FWF kit from Jabiru USA early version, we figured that they had everything figured out.  Obviously, in my case although we followed the install instructions to a tee, we still are playing with all things engine and cowl.  In terms of the angle of incidence, my friend and I went flying the other day  and he took a picture of me and I believe it looks as if that when in cruise my nose of the aircraft is up, which might account for some sort of impeded airflow into the cowl.  I'm asking this question, becasue when we all obviously point the nose down in descent we get better airrflow and CHT's tend to come down.

  

 Any thoughts on this matter.

  

 CAVU,

  

 Jeff Paris Ni196ZP Jab 3300 Ch601XLB  N127ZP Jab 3300 Eurpoa Monowheel in drydock


	


-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus re-drive.

do not archive.

- The Matronics Zenith-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?Zenith-List

_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

Display posts from previous:

	Matronics Email Lists Forum Index -> Zenith-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