aft height effect on hull resistance on a vessel

Hey guys,

when we talk about the resistance of a displacement vessel (slow moving boat etc. not going faster that the hull speed) we know that if the aft part of the boat has high draft it will have higher resistance (in general, unless the aft parts is very narrow, I guess) because the wave will not be "cut off" from the aft of the boat so easily (picture 1).

If the aft of the vessel is near the water surface when driving, the water will be "cut off" from the hull more easily and will lead to less resistance (Picture 2).

My question is this. If the aft point would be above the water surface, would that also be okey in general?
I have attached 2 random pictures from online so you get the point. Usually I have seen it designed that the aft point of the hull (green arrow) is just at the waterline or little bit below. Would it be okey if the aft point is a bit above the waterline?
I think that would be okey and result to lesser resistance compared if the aft part has greater draft resulting to the effect that the wave will not be "cut off" from the aft of the vessel.

Does anyone have any knowledge on this?

 

Aft point above the waterline is quite common .
Reliant Yachts | 40 Aft Cockpit https://reliantyachts.com/40-aft-cockpit/

 

At or above the water would be best, generally speaking.
Like in the middle picture.

 

It actually depends on the Froude number, the aft buttocks, and to a lesser extent, the prop location. Without knowing more about the basic shape of the hull, length to speed and beam to depth ratios, and finally transom type...not much else can be said.