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I have an old Radio Shack "sound level meter" if you want it send me 13 dollars for the USPS box and you can have it. Measures 60 to 100 Db. Takes a 9 volt battery. Stored without a battery in it. Battery compartment looks as new. Has OH, Reset, Min, Max, Weighting, and response. Has a data output port. A calibration port.
An LCD screen. And a 1/4 20 camera mount hole for a tripod mount. We measured sound at 50' from the edge of the track.
Used to measure sound on a Mazda powered race car...............Lynn E. Hanover
lehanover@aol.com
In a message dated 2/1/2021 4:35:09 PM Eastern Standard Time, flyrotary@lancaironline.net writes:
Mat,
Still working on the turbo, which means I have yet to fly with it. Have also added a muffler, straight through, which has added another 15 pounds weight. Apparently nil backpressure. Other than the opinions of the muffler manufacturer I have no idea, but am determined to shut the noise up.
Regards,
Neil.
From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Friday, January 29, 2021 1:51 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Exhaust
Neil,
I haven't flown the plane since Oct, hoping to head back to the States in two weeks.
*Fingers crossed*. But in Oct, flying the plane around the exhaust noise is a non-issue. I can talk to my passenger, and hear the radios. I like the CAN centerforce design. I want to add some back pressure sensors though, measure the CAN vs exhaust. Any idea what is too much for a rotary ?
Here's a link that talks about the exhaust.
https://www.homebuiltairplanes.com/forums/threads/exhaust-within-subcowl.30848/page-2#post-512762
With the slip joint bellow, the outside 321ss cracked at the according folds. The new one will be 625 inconel folds. Guessing too much vibration. How has everyone else run their exhaust under the plane? Do you put in any slip joints, or 1 big long connection. The bellow actually turned out where the orange pipe is. I'm wondering if I should put it in a different place now.. Can't attach pictures here, check out the link to HomeBuilt.
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