In an extreme case, this might occur in Force 3 winds. On some of my designs, I have used what is called a knockabout bow, thus eliminating the bowsprit. This will add several thousands of dollars to the hull cost versus a few hundreds of dollars. Generally speaking, if the engine is well matched to the vessel, then for the average vessel 16 gallons per continuous shaft horsepower will yield about 3000 nautical miles. On a long slender vessel of the same displacement for the same mileage, it will be on the order of 11 gallons per shp, and on a shorter fat vessel with the same displacement and horsepower 20 gallons per hp can be expected.
Waterline length is the main basis for speed.
To achieve a given speed is dependent on horsepower and displacement. I am not a licensed broker, but there have been occasions when I have known of a vessel for sale and been able to put a buyer in touch with the owner. On occasion I have done surveys, but will now do only those of metal construction. My present location makes a survey rather expensive because of the traveling time that could possibly be involved. I build boats only for my own use and some prototype and experimental hulls for others.