[Finster]

Red20, thats seems like a lot of weight for a 20 on a stock transom. Df115's are 385 lbs. and the newer 2 strokes are not that much lighter. I could see possibly doing it with older/lighter 2 strokes, if thats your thing. But in my opinion if you sit 700+lbs. on a stock 20, your gonna sink.

Back to the 45% hull thing. I agree with Fr Frank on that. I have a 15 whaler dauntless, and that boat can't help but porpoise. Though my feeling would be, if you put say a hermco bracket on, which is more or less an extention of the hull it would give greater than 45% there for eliminating the problem. But I'm not going to try it.