Mike. Can I just add a cautionary tale here….I built an "Island" class fishery patrol vessel years ago, basically a north sea trawler displacement hull, and when i was experimenting with motors I put in a whopping great torpedo 800 or something… and the bow wave it created you wouldnt belive, and the stern was actually below the level of the pond ! its massive forward speed was the only thing keeping the oggie out of the hull (but it was great fun!). The point of this dire tale is..displacement hulls have a designed top speed at which they are comfortable with, more power than that designed just makes the stern dig in, semi-displacement hulls will go that much faster, and MAY take more power as a model .As an aside, I noticed the other day that my modern HMS Manchester remains level from rest to max..the bow does not rise to any extent, but its a warship of course, long`n`thin. . Ashley