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Old 07-25-2017, 02:32 AM
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magiccarpet magiccarpet is offline
 
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Default Clearance of exhaust pipe in lower cowl

I have noticed that I need to make the cutout for the exhaust pipe in the lower cowl a bit larger. I am unsure what minimum clearance shall be achieved around the pipe to prevent damage from heat. I don't have the assembly instruction right here, but I can not recall that Van's specified a dimension there.
I target a clearance of 1/2". Is that enough?
Thank you !
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Old 07-25-2017, 06:50 AM
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Are you worried about clearance for the heat or for the vibration?
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Old 07-25-2017, 07:00 AM
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magiccarpet magiccarpet is offline
 
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Quote:
Originally Posted by snopercod View Post
Are you worried about clearance for the heat or for the vibration?
I am more concerned about the heat. For vibration I think 1/2" around the pipe is more than enough.
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Empennage, tailcone, wings and fuselage done
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Old 07-25-2017, 09:09 AM
DHeal DHeal is offline
 
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IMHO, 1/2" clearance is sufficient. However, you may find yourself increasing this clearance somewhat to facilitate installation and removal of the lower cowling.
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Old 07-25-2017, 05:32 PM
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I have no special knowledge but went with 1" of clearance on my plane. Different airplane, I know, but here's what my cowling exit looks like. The "down turns" are for two reasons. 1: Noise. The straight pipes caused a racket in the cockpit, and 2. Now the exhaust doesn't leave residue on the bottom of my plane:

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