REFLECTOR: Clocking the Exhaust

[Velocity Aircraft Owners and Builders list]

Here is a drawing of what Clinton at Custom Aircraft designed for me. He worked with my cowl clearance numbers and was a fantastic resource.



[cid:image005.jpg at 01CF961C.77ECEBE0]

[cid:image006.jpg at 01CF961C.77ECEBE0]



These pipes are shorter than most because I wanted to submerge them in the cowl rather than have them sticking out in the breeze. ("My" design was mostly copied from Don Johnston's, but it's much shorter. You're welcome to steal my design, if it helps.) I'm hoping to get some additional pull of air through the cowl with the venturi effect. You should also check out Brett's site, www.VelocityXL.com<http://www.VelocityXL.com>. He has some good photos of his exhaust-augmented cooling

http://www.velocityxl.com/content.php?162-Section-Exhaust-Augmentation



I can't tell who you are . . . you didn't sign your post and email addresses are now stripped from Reflector posts. So I can't provide any advice specifically for your plane. Let us all know who you are, what aircraft you have and what engine you're working with. Perhaps that will spur more discussion!


Reiff Lorenz, Dayton, OH
Velocity XL-RG, 60% complete
Currently working on: Oshkosh!








-----Original Message-----
From: Reflector [mailto:reflector-bounces at tvbf.org] On Behalf Of Velocity Aircraft Owners and Builders list
Sent: Wednesday, July 2, 2014 4:40 PM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Clocking the Exhaust



I am removing my turbocharge because of cowl temperatures, and will install it at a later date after I've solved my other more pressing heating issues.  In a nutshell, I'm trying to reduce the complexity and address heating one variable at a time.  I am having hoses crack and sensors (crank timing for EFI) fail due to the heat.



I asked Clinton at Custom Aircraft about turning the exhaust straight back towards the prop, and he recommended against it, suggesting that if I do a merged log design, I'll need a ball joint and hanger to keep from cracking the exhaust where it turns down.



I've seen other examples where the exhaust is merged into a common log and points directly aft, using augmentation to help with cooling along the way.  How are people able to keep their props from getting scorched by the exhaust?

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