RE: Overloading an engine
Greg,
These curves appear in a Cartesian plane with two vertical axes.
You had used oz.in. units in the right side axis and spaced them so both curves would appear within the same area.
It is, however, a bit twisted...
The horizontal spacing between 3,840 and 4,400 RPM should have been much greater than between 4,400 and 4,450 RPM...
The former should have been nearly 11 times larger than the later... But they are equally close together, as portrayed in the graphs...
Also, the absolute HP numbers are higher all over the range, compared with those computed with the generic 3-blade constant (1.45) from the Pé Reivers Prop-Power.
I did not compute if the lbs.ft. to oz.in. numbers are proper, but since they are a bit less than double the numbers of .61 size two-stroke engines and this engine is geared 2:1, I guess that you did do your homework...
And yes, in automotive fora I also participated, when I did a bit of hot-rodding (over 15 years ago).
It is very difficult in this country...
What else would you want to know about it?