What makes a good hull?

At first I had no idea.

I was inspired by the feedback I got from Glyn Lancaster Jones, mr. C. Taylor and the pictures I found on the LIFU CD from the SBA. I like the classic lines of the launches below.

So while thinking about what makes a good steam launch I composed the following demands:

1. relatively small beam compared to the length, beam to length ration preferably about 4

2. able to steam on waves upto caused by the more that 100m barges sailing on full spead along where I live.

3. large bilge section for stability (low position for the heavy stuff) AND (and this is the big problem) deep enough for a big propellor of at least 18"*28";

4. nice smooth entrance;

5. certainly no counter stern ( fantail) to prevent the stern to sink into the water while steaming and also having not to carry the extra weight of the part hanging above the water;

6. wine glass shape transom, beautiful;

7. made of steel or wood and certainly NO Plastic of any type;

8. light and easy to build;

9. classic line --> round bilge, certainly no single or multi chine design.

#2 was the reason why dutch models were not suitable: they are all made for shallow waters, a real dutch tradition/speciality. The beam to length ratio is about 3 or worse >  big water displacement for every inch under the water > small propellor needed. 

After studying the BSA register and surfing around on the web I came across the 17.9" Indian Runner  by Selway Fisher as the launch that meets all (exept the length to beam ration, which is about 3.5) of my demands, which is rather unique.