X-Mozilla-Keys:                                                                                 
Archie wrote:

Paul, The point is to minimize piston/wall clearance within parameters
of the metallurgical/ thermal coefficient of the respective parts. To that
end,
rather than use a conventional aircraft piston, which would have to be
modified anyway,

These are designed around a non-barrel elliptical shape. I also incorporated
nylatron skirt and pin
buttons similar to what we use in nitro engines. This means that initially
there is no p/w clearance.

In order to get away from engine break-in and cross-hatching, I used ring
combinations of SS, Plasma moly barrel, & reverse taper ductile.

I did not use mineral for break-in. By the time it was on the runway, it
was, perhaps, 95% seated.

If I keep writing, will not have any material for magazines.
Will check on current CHT to-morrow.
Will be glad to answer any minor questions.
Archie

How long will that nylatron last Archie? Will it take 400 degrees F?

Paul Lamar

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