Speed thru water or GPS speed over ground

[FF]

34' Displacement Hull

the hull pictured does not look like a displacement style hull.

Sure its cheap at low speeds , most boats are.

But the transom looks far to wide for a pure displacement boat.

Of course you get a nice fine useable aft deck , perhaps 2 -3 ft narrower would never be as comfortable.

The difference would only be 15% so at 1800 rpm ,, 15% of 2.2 gph would not save a big amount of bucks per year.

 

[bobc]

Displacement shape

34' Displacement Hull

the hull pictured does not look like a displacement style hull.

Sure its cheap at low speeds , most boats are.

But the transom looks far to wide for a pure displacement boat.

Of course you get a nice fine useable aft deck , perhaps 2 -3 ft narrower would never be as comfortable.

The difference would only be 15% so at 1800 rpm ,, 15% of 2.2 gph would not save a big amount of bucks per year.

I guess I consider the DeFever to be a full displacement boat because of the deadrise. As you can see, there's not a lot of transom below the waterline, and nothing to provide lift.

My mileage numbers are generally a bit better than what I listed - these numbers were taken with a full load of fuel and mostly full water tanks.