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Date:  2-21-2017
Number of Hours:  4.00
Manual Reference:  12.2.1
Brief Description:  Cut cowling for exhaust and made 4” tube.

I used a plumb to find a starting point for the exhaust ports and used a 3" hole saw to start the opening then connected the holes. There was a small adjustment made to the cut out hole and the exhaust now has good clearance. The 4” extension tubes will fit great when fitted to the cowling.
I used duct tape on the 4” paper tube and Vaseline for a release agent and I still had to slice down the middle to remove from the 4”tube. The Vaseline was just a mess and I will not use this again.

I used a string and a vacuum cleaner exhaust to blow air trough the 4” tube to see were the sweet spot for vacuum will be and will retest when it's glassed to the cowling.
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Cut outs for exhaust.

Cut outs for exhaust.

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Suction test with exhaust pipe

Suction test with exhaust pipe

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4

4" cowling extention

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