whoops, forgot to attach the screenshot.

I plan to use this in the future to measure from the cockpit, on the ground behind it while doing a run-up and from the ground under the departure end of the runway, then do the same 3 tests again for a O-360 powered RV6 that resides at our airport

Todd


On Mon, 2010-07-12 at 15:12 -0700, Todd Bartrim wrote:

Hi Dwayne;
When making changes to your muffler it would be nice to have a decibel meter to get a measurement. These can be found on ebay for reasonable prices, however I also found a free app called DeciBell for my android phone. It seems to work great and while I don't have a lot of confidence in it's accuracy compared to a professional quality meter, it will allow you to make some meaningfull before and after measurements when making changes. Attached is a screen shot of the app. This app is in the android market and may also be available for iphone.
I realize that not everyone has a smartphone, but I know of a heck of a lot more people that have smartphones, than I know with decibel meters, so if have one or have a friend with one and can get him to install the app then it's a handy tool to make a quantitative measurement of the effect of your changes.

Todd Bartrim