Originally Posted by simsy
''as probably impossible to change engine for a long shaft''' what do you mean / why do you say this? I would like to see your installation. Only 110 - 120kg base boat weight, so massive power not neccessary.....
Was reffering that you have a short sgaft engine when needing a long shaft one, so probably changing, selling, buying a long shaft engine is not the way to go for you.
In my particular case my rib's keel to transom distance is 46 cm, this gave excellent speed in flat calm waters at straight courses, excesive ventilation at choppy seas and tight turns. Chopped transom dowm 5 cm to 41 cm and rearranged both engine plates to transom level, have reached the best transom height for best speed and inmaculate tight turns at wot. Engine is reving at 5600 (top is 5800) at 40 Km/h. My rib/engine combo weights 150 Kg.
Is not that Tohatsu has a larger lower leg, it's just it's tail design, a bit different that other brands lower legs. The distance stated on owners manual is just a refference from where to start, if you want ribbing perfection you need to fine tune engine height, most people just sits engine matching same size leg to same size transom and that's it, but are losing the best engine performance that can be taken out from any engine.
Trimming engine all the way down is no the way to go, rib will tend to bow excesively down. With engines that dosen't have electric trims you just need to have engine sitting perpendicular with a well ballanced boat. No need to be constantly playing with trim. This is the perfect height for your engine, check video.