hi all
just taken delivery of a lovely new boat
its a ribcraft 4.8 with a 60 hp engine
with 4 people on its lovely top end speed of 38 knots and gets on the plane real easy
however i do want to use it for diving and will be loading it with 4 people and 4 sets of diving gear aprox 500kg
when i loaded it with the gear it was slow to get on the plane perhaps 40 seconds
so down to specifics it currently has a 17 pitch propeller on and ribcraft are suggesting i may be better off with a 16 pitch which will reduce top end speed but speed up plane time
have you been through this can you advise how much it will drop top end speed and how will it effect the boat
That's great performance you are getting, don't think you can get a 16pitch as they normally drop by two, so a 15 would be the next drop down. Is your prop aluminium or stainless and what 60hp engine is on the boat. I get 29 knots max from a 70hp on a 5.2 rib after much prop testing and fine tuning, is your speed from a gps or dash mount gauge?
That's decent speed you're getting, I would be dropping more than 1" of pitch if you're carrying that amount of gear. 14/15" pitch props is what I'd be looking for.
That's great performance you are getting, don't think you can get a 16pitch as they normally drop by two, so a 15 would be the next drop down. Is your prop aluminium or stainless and what 60hp engine is on the boat. I get 29 knots max from a 70hp on a 5.2 rib after much prop testing and fine tuning, is your speed from a gps or dash mount gauge?
What maximum rpm do you get.
Jon
hi
speed is from gps
its an aluminium prop
the engine is a susuki 4 stroke
conditions were like glass
Seutrek
