Gary;
Funny you mention the rod. on my second flight, with my y/a f-4, my K&B 1.00 decided to throw the rod. I had just taking off, about 20' up. needless to say, the engine siezed, spun my fan off, and down she went. not pretty.
I have experience with df's, but most of them were produced in "modern" facillities. a little more math might of been used.
maybe???

Bill;
I don't think i have to worry about my O.S 77 going over 40k.
as gary stated, the rod will fail before that.
I should start work on the sabre next week. my carden extra is just about done.

Thanks George