The Jalopy Journal
Just a darn minute. When did a triangle start having "edges"? It must have come out of a Midwestern geometry book. Iowa?
I suggest you consult "Internal Combustion Engine Fundamentals" by Dr. John Heywood (MIT...And that's not Mississippi Institute of Taxidermy.)...
I figured someone was going to take the bait.
How about 1/e?
Every now and then they are listed in Trade-A-Plane. I used them when I was with the airlines and the Parker version can't be beat. I made sets of...
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The Jalopy Journal