Curious you should bring up the trebuchet, Yolk. I was just informed last weekend that my oldest son desires to launch pumpkins in a competition with a few of his cousins.

I've since been scouring the net' in search of plans for medieval siege engines.

But you're correct....edge mower comes first!

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.