Exhaust extension - effect on tuning rpm  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Exhaust extension - effect on tuning rpm
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Exhaust extension - effect on tuning rpm - 5/7/2003 11:22:19 PM   
JimTrainor


 

Posts: 1308
Joined: 10/25/2002
From: Ontario, ON, CANADA
Status: offline 		I am setting up an OS46FX with a Jett Stream muffler.

I am using a 1/2 inch extension to make it fit the plane. I understand this will drop the tuning frequency of the exhaust somewhat. (I'm not shooting for all out speed, so that is fine - even good - for my application.)

The instructions that came with the muffler state the tuning rpm is 15000. My question is: what is the tuning rpm with the extension in place? I'd like to pick a prop that is a good match, so any info would be very helpful.

Thanks!

< Message edited by JimTrainor -- May 7 2003 7:51PM >
       Post #: 1

Exhaust extension - effect on tuning rpm - 5/11/2003 8:57:19 AM   
JimTrainor


 

Posts: 1308
Joined: 10/25/2002
From: Ontario, ON, CANADA
Status: offline 		I got a picture... thought I'd post it.

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(in reply to JimTrainor)
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Exhaust extension - effect on tuning rpm - 5/24/2003 9:36:37 PM   
bob27s



Posts: 4819
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hi Jim.


sorry for the delay in replying, but I was away on vacation.

The extension will drop the bottom end of the tuning range about 500 rpm, but the muffler has a broad band that goes well above 17,000.

You still want to prop the engine to run around 16,000 or so. Usually that combination will easily turn a 15,500 with a APC 10x6 so you may wish to start there.

Nice looking plane and installation. Let me know how the performance is !

Bob Brassell

(in reply to JimTrainor)
       Post #: 3

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Exhaust extension - effect on tuning rpm
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