Sticking with Humber OP, I notice the 5.0-5.3 has a 2.0 beam and then the 5.0-5.5 has a 2.2 beam with higher sheer bow, (as does the Destroyer) plus the 5.5 will take a 115hp. hmmmm
The down sides of the old SR 5.4, low bow,low rear transom and only taking a 90hp are removed. Maybe that's my answer.
Polwart. 5.8 destroyer is 385kg (and takes a 130hp) 5.5 is 360 (whether OP or Destroyer). So i guess that's just whether you want chines or not. (Yes please)
Ah well, it's a way off yet. But i reckon 5.85 is a maximum. 6.0 too close to what we have.
Still want to see what the
is in the SR4. There must be something.