Lack of response could be because know one knows what part you are talking about.
There are a lot of different vents that have been used on RV-4's over the years. Since you call it a triangular vent, I assume it is some type of NACA vent, but that still doesn't narrow it down very much.
If you could post a picture it would probably help.....
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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