Originally Posted by nabiul
How much power would you estimate it to be compared to today?
I think it is difficult to say - in days of old the manuf's measured it at the powerhead, whilst today it is measured at the prop, after going through the gearbox. I seem to remember someone suggesting a 10% drop (that it down to 8.5HP, IF
it was running perfectly, but its not - so maybe you are actually only getting 7HP out of it...
It's difficult to have all the weight forwards on such a small boat and each of us weighing so much.
tiller extension is the way.
If it were me I would
1. Fix the engine problem - its pointless trying anything else until you do.*
2. Load it lightly, and with as much weight forward as you can (perhaps just you and a tiller extension, fuel and anchor).
3. Adjust trim and maybe engine height until happy; you said you trimmed UP - you probably want to be trimming DOWN (moving leg closer to transom) to bring the bow down and help it get over the hump.
4. Get someone to film it - so you are not guessing what it looks like - how it feels inside and outside is often different.
5. Then add more people / kit and see how it handles.
* I'd also want to check you have a sensible prop on there (so you need to know what it is, what the gearbox ratio is, what the recommended revs are, and what max revs your getting, and stick a GPS (phone in a bag) on to see what speed you are getting). If it was last on a 5 tonne sailboat pushing at 6 knots it may not be the right prop to get you on the plane.