Jersey Sea Skiff Performance?

[FAST FRED]

IF the assumption is correct that one of the "secrets" of the Atkin style box keel and negative deadrise aft is the acceleration of ALL the water under the hull, rather than just the propeller diameter, a good question would be can this be enhanced?

Ordinarily a large slow turning geared down prop gives the most thrust, but Atkin used 1-1 .

Sure some was prop diameter constraints to keep the boats beachable , and perhaps to keep costs down.

But could some of the value of the design be from the higher velocity prop stream , accelerating the rest of the water trapped aft to a higher thrust?

Have looked at steam injectors , and many have a resemblance to the aft Atkin shape .

What prop setup would maximize the entire water flow aft?

FF

[kengrome]

What prop setup would maximize the entire water flow aft?

I figure three of them, the big 10 inch prop in the center as designed, and two smaller props of perhaps 6 inches each -- one on each side maybe 6-12 inches forward of the aft end of the box keel.

I think the smaller side props would accelerate the water flow in each individual side tunnel before they merge to become one huge tunnel aft of the box keel. Then the larger main prop can "take over" and continue to blast the water aft.

Note that I am NOT thinking of building a three-propeller Seabright Skiff (not right now anyways) ... but it just so happens that I am building a Tolman Seabright Skiff at the moment, and I have a few pictures online now:

http://www.tolmanskiffs.com/seabright/