Which 4m engine/hull combination?

[mobydick]

I am thinking of buying a 4m RIB and wondered if anyone has any ideas as to the best hull /outboard for the sea?I would like a 50hp on the back but am wondering if I could get away with a 60hp or would that be too much weight for the transom?Thanks,Dick.

[PeterM]

My 4m avon is for sale with 50 hp on the back - put doel fins on it to balance it out. If your inthe area your welcome to come for a spin to get an idea !

[mobydick]

Thanks for offer but I wont be buying till next year and I am 400miles from you.What sort of speed do you get out of your outfit?

[PeterM]

About 30 kts max , was a bit more till I fitted the fins. Went for the max to ski etc, but it really is tail heavy. If you can I'd say go for a 4.5 /4.8 of somekind with a 60 , or an 2 stoke of some kind instead of 4s .

[Polwart]

Originally Posted by mobydick

I am thinking of buying a 4m RIB and wondered if anyone has any ideas as to the best hull /outboard for the sea?I would like a 50hp on the back but am wondering if I could get away with a 60hp or would that be too much weight for the transom?Thanks,Dick.

moby that strikes me as a really odd way to go about 'speccing a boat'. the engine will depend on the boat (e.g. my own boat is rated to 30HP, but some heavier boats are rated for 40 or 50 HP), in reality both boats could perform similarly: lighter hull, lighter engine, less fuel on board (for same range), possibly shallower V etc. another boat may be more suited to extreme weather but then in those conditions you probably won't want/need all the power for top speed either.

So I would pick the hull first, then go with the engine that gives the desired performance with that hull. Oh - and don't fall into the bigger is better trap with engines. There are disadvantes to too much power beyond just the transom weight.

[mobydick]

Good points.Who makes the most seaworthy 4m[avon searider?].

[Downhilldai]

Originally Posted by mobydick

Good points.Who makes the most seaworthy 4m[avon searider?].

Yep
A SR4 with a 3 cylinder Yam 50 2-stroke and you'll be smiling for a long time

[Tim M]

Originally Posted by mobydick

Good points.Who makes the most seaworthy 4m[avon searider?].

Ribcraft 4.8

[Downhilldai]

Originally Posted by Tim M

Ribcraft 4.8

How about a 6.5 Vipermax?