Hello,
Wondered what sort of speed I will get out of my rib with a 15hp outboard ? Is there a rough guide as to mph per hp, and is there a formula showing kg/stones per hp needed to get on the plane. Understand that persons on board will make a big difference. She has a fibreglass bottom. Will it pull a ski biscuit ? Sorry about the questions.
Hopefully I will be too ( if I can find a couple of hours to flow coat one night this week) - but with only the 13 ish hp of the Johnson GT .
I'm hoping to see 20knts on flat water 2 up.
I think you may get away towing with it if its very flat water , if not you'll find it hard as with little weight it will get knocked about off waves very easily. I have turned the D rings outwards on the one I'm working on for just this purpose.
I was also quoted 20knts for an Avon-Bombard 3.1m with a 15hp engine by someone on the Avon stand at the Southampton Boat show.
Need to get the engine running properly first though - got it as a non-runner on flea bay - now starts but haven't tried running it for long - not even sure if the fuel pump works yet!
I used to run a 3.1 Avon with a 10hp Mariner. I hit 20 knots on GPS 1 up.
With the extra 5hp should get about 22 knots.. I fitted duel fins for quicker planing and would plane at 5 knots!
Wow thanks for the feedback couldn't ask for more ! And couldn't ask for more if you know what I mean ha ha.
If I get near that sort of speed I will be a very happy bunny.
