Why not use a design from 1916?

So an updated conclusion from the headline of this thread from my perspective would be: A 100 year old design may be a good design indeed but if made for a displacement based on wood production and a heavier engine it may not be a good idea to use the same design today if updating the production methods to modern lighter materials if thus changing the displacement.

Many thanks again.

 

I can see why, pretty cool

 

Vingt et un, Crane design (early 20th C), might be interesting, if you can find the line drawings.

26 mph (knots?) from 21 hp. Double ended, I think, but what I haven’t been able to discern is if there were something like what might be called ‘bat tails’ (2 horizontal fins) at the stern of Vingt et un, like on recent windsurfing race longboards.

I’ll see if I can find a pic of bat tails- aha!

2025 Phantom Windsurf Board https://star-board.com/products/phantom-windsurf-board

My thinking of how this might work work is that the bat tails effectively allow a low speed low prismatic hull that morphs dynamically into a higher prismatic hull as the hull rises from the agua and planes, the top of the bat tails clear of the air/water interface (kind of like planing shoe?), with a penalty of higher wetted surface but lower wave drag at lower speeds, assuming that the horizontal fins don’t mess with the pressure reattchment of flow at the stern when the stern is in an Archimedean regime.

Experiments at full size!

 

The boat does not fulfill the requirements of the OP. He wants 6 people to go in confort. That boat was wet, rolled horribly, had no head or galley or sleeping areas. It was a race boat. That design is like getting a Ferrari to use as a motor home.