Hi everyone,
I am another novice contributor to the forum. I took delivery of Aquarius, Parker 235/60 in September and have found all the discussion on the forum of great interest and help, both prior to placing an order and subsequent to taking delivery.
I have the 6hp Tohatsu shortshaft engine with saildrive prop and I have set the tilt angle at the first hole, so that the engine is mounted on the board in a vertical position. It does appear however that when under power quite a lot of "wash" comes to the surface of the water behind, which probably suggests a partial loss of thrust, and perhaps a longshaft may be more efficient. On the other hand, I still seem to have quite good drive even at just half throttle which is about all that I can use due to running in the engine.
Thought I would just throw in my observations on this subject.