A 2 3/4" hole saw makes quick work of making the hole in the panel. Some paper templates helped determine the hole needed to vary about .25" from where the plans specified.
The 2.75" plugs cut from the panel made good components to make forms for the adapter that goes on the back side of the eyeball vent.
A chunk of foam on the belt sander yielded a nice aerodynamic ramp without much effort.
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| The plans say to cut the NACA vent, then trim the inside 1/4" larger and remove the foam and micro. Make a ramp in the foam. |
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| A scrap piece of foam has a nice ramp formed with the help of a bench top belt sander. |
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| The 2.75" plugs from the panel holes, some cardboard tube, box tape, round backer rod cut into quarters and some left over strake foam were used to make forms. |
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| The finished product for one side. |
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| A binder clip was used instead of a Cleco to hold the NACA flap in place. Some spring clamps hold the adapter in place. |
The outside air temp probe will be mounted on the front side of the chamber. Several folks suggest adding an avionics cooling tube.
Update: The OAT was installed in the pilot side chamber since it is out of the sun, and is a very short wire run. On the co-pilot side the AP pitch trim bracket needed a little extra support so an angle bracket to this chamber to the AP servo eliminated flexing of the AP bracket. I installed the original black plastic Whisperflo vents that notoriously don't shut completely off. The newer vents are aluminum but get good reviews.
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