I'm toying with the idea of getting a little boat something like one of the Suzumar
range, that I could stick my new 6hp aux engine on to for messing around on where I can't (or can't be bothered to!) put the Destroyer in the water for whatever reason.
What sort of speed might I expect to get out of something of the 3m size range, 1 fat bloke and a 6hp on it - I'd guess somewhere between 10kt and 20kt - is this reasonable? Would there be any significant difference between, say, the Suzumar 290 SIB and 310 RIB? I have no idea how the "hull efficiency" would compare between a SIB and a RIB of the same size, I assume the RIB might be better but the ability to roll it up and stuff it in the back of the vehicle would be handy
The other thing is that it's a long shaft engine as that is what is needed for the Destroyer, while the little Suzumar's transom height looks like it would suit a short shaft engine. I guess that'll knock a bit off the speed with the extra length dragging in the water.
Working on theoretical figures, with a 7" pitch prop and 10% slip and the gear ratio listed on the Suzuki website (the 4/5/6 Johnson four stroke engines are made by Suzuki) it ought to do a whisker under 15kt but I don't know what sort of slip you should expect on a much smaller boat or with a small engine?
Any thoughts please? It is only a vague idea that it might be a bit more fun for not a lot more money and make better use of a shiny new engine