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exhaust pipe clearance

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Wed Jun 10, 2015 12:01 pm Post subject: exhaust pipe clearance

Gentlemen…here’s a situation and a question:



I have maintained 1.50 inches clearance between the inside surface of my lower cowl and my engine exhaust pipes. I set this up w/ the assumption that this would be adequate considering that I have used a 

high temperature flame retardant resin (HTR250FR, by Resin Services, Inc.) for my custom cowls. It maintains a “Flexural Modulus at 350 degrees F. of 6.25 x 36,000” (whatever that means).



Would anyone be willing to opine on the advisability of applying some “aluminized, adhesive-backed, heat barrier, to reflect radiant heat away from the cowl surface and back towards the engine and exhaust?



(This so-called “heat barrier” is a composite consisting of aluminum foil on a backing material which looks like burlap to which is applied an adhesive good for 350 degrees F.) 



(I have a total of 10 sq. in. of inlet and 14 sq. in. of exit area for air circulation within the cowl.)



(Obviously, this is not a 9xx Rotax installation.)



Comments and opinions appreciated in advance,



Fred

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rehn(at)rockisland.com
Guest

Posted: Wed Jun 10, 2015 1:32 pm Post subject: exhaust pipe clearance

Fred

First, I have a Rotax 914. I had a little discoloration from exhaust heat on the cowling near the exhaust pipe exit. Probably less than an inch clearance. I used simple aluminum backed tape on the cowling, it is usually good for 2 or 3 years before I replace it, works fine, is light, eliminates further  Issues to  cowling. Keep it simple and light. You may not even have an issue with an inch and a half clearance . Wait and see, you may have good circulation of air and your cowls sound robust for heat.

Can't wait to see you flying over Roche!😃



Sent from my iPad



 	  Quote: 	
		   On Jun 10, 2015, at 12:59 PM, Fred Klein <fklein(at)orcasonline.com> wrote:

 

 

 

 Gentlemen…here’s a situation and a question:

 

 I have maintained 1.50 inches clearance between the inside surface of my lower cowl and my engine exhaust pipes. I set this up w/ the assumption that this would be adequate considering that I have used a 

 high temperature flame retardant resin (HTR250FR, by Resin Services, Inc.) for my custom cowls. It maintains a “Flexural Modulus at 350 degrees F. of 6.25 x 36,000” (whatever that means).

 

 Would anyone be willing to opine on the advisability of applying some “aluminized, adhesive-backed, heat barrier, to reflect radiant heat away from the cowl surface and back towards the engine and exhaust?

 

 (This so-called “heat barrier” is a composite consisting of aluminum foil on a backing material which looks like burlap to which is applied an adhesive good for 350 degrees F.) 

 

 (I have a total of 10 sq. in. of inlet and 14 sq. in. of exit area for air circulation within the cowl.)

 

 (Obviously, this is not a 9xx Rotax installation.)

 

 Comments and opinions appreciated in advance,

 

 Fred

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Wed Jun 10, 2015 3:36 pm Post subject: exhaust pipe clearance

 	  Quote: 	
		  On Jun 10, 2015, at 2:31 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:

 Keep it simple and light. 

	


Jerry…apropos weight, here are my preliminary numbers subject to finish paint, ELT, and some tools:



 	  Quote: 	
		  2.  XX Mar 14 using W. Munich’s acft scale w/ 4 qts oil + 1 gal. coolant placed top of cowl:

		Main Wheel:	757.0#

		Tail Wheel:	  77.8#*

		Total:		834.8#



		*	Includes blocking weighing __?__



		C of G:		60.67”



		NOTE:  Batteries are mounted on FG platforms which have NOT as yet been bonded in 				place and are free to slide fore or aft in accordance w/ C of G requirements after 				ALL components have been installed.



			NOTE:  Engine requires 5 quarts of oil because of increased volume of oversized filter.

	


All in all, I confess to having been both pleased and surprised…



F.

 [quote][b]

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paul.the.aviator(at)gmail
Guest

Posted: Thu Jun 11, 2015 6:06 am Post subject: exhaust pipe clearance

Fred, the stuff works okay but the glue doesn't hold up. - Paul



On Wed, Jun 10, 2015 at 2:59 PM, Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)> wrote:

[quote]--> Europa-List message posted by: Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)>

 

 Gentlemen…here’s a situation and a question:

 

 I have maintained 1.50 inches clearance between the inside surface of my lower cowl and my engine exhaust pipes. I set this up w/ the assumption that this would be adequate considering that I have used a

 high temperature flame retardant resin (HTR250FR, by Resin Services, Inc.) for my custom cowls. It maintains a “Flexural Modulus at 350 degrees F. of 6.25 x 36,000” (whatever that means).

 

 Would anyone be willing to opine on the advisability of applying some “aluminized, adhesive-backed, heat barrier, to reflect radiant heat away from the cowl surface and back towards the engine and exhaust?

 

 (This so-called “heat barrier” is a composite consisting of aluminum foil on a backing material which looks like burlap to which is applied an adhesive good for 350 degrees F.)

 

 (I have a total of 10 sq. in. of inlet and 14 sq. in. of exit area for air circulation within the cowl.)

 

 (Obviously, this is not a 9xx Rotax installation.)

 

 Comments and opinions appreciated in advance,

 

 Fred

 

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