At full speed my jon boat, intended for planing, wastes a lot of energy making stern waves since the Torqeedo doesn't have enough power to plane the boat. So, I built a hull extension to turn it into a displacement boat. It adds about 3' to the waterline length and improves trim since it provides some much needed buoyancy aft.
Sadly, there was no improvement at full speed: 5.7 mph before and after.
Things improved a little bit at 3/4 speed: 4.5 mph before, 4.7 mph after.
The greatest improvement was at 1/2 speed: 3.6 mph before, 4.3 mph after. At this speed the stern wake is very smooth. This is probably the actual hull speed and the best speed for the greates range.
I suspect greater performance across the board when I have two grandkids on the bow seat!
See the photos in Dan's folder at http://groups.yahoo.com/group/electricboats/photos/album/1558352835/pic/list
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