On Aug 23, 9:24 pm, (Frank Ch. Eigler) wrote:
It may be interesting that the vulnerable time between the spark and
TDC is also to some extent under one's control, with the blue knob.

Good point, and you are of course correct. This takes us into a whole
'nother discussion - not can you run oversquare safely (because of
course you can, and virtually every flat-four, six, and eight out
there does) but how much oversquare you can run and under what
circumstances. This is precisely the factor that limits how much
oversquare you can run in most circumstances.

I left that part of it out mainly because I've never heard anyone
advocating making high density altitude takeoffs at reduced RPM, and
the post was already longer than most people will read.

Michael