I need some prop advice.

[Ribfisher]

HI,
At this moment I use a alu .prop 17" on a Ribtec 585 with a Honda 90 HP.
Cruising speed 24 Kn at 4500 rpm -full trottle 32 kn at 5400 rpm.(Heavy load)
However I want to use the full powerband of the engine and I want to go
to 6000rpm.
Could that be possible with a 17" Stainless Steel prop?
Which brand,type should I order?

[froglover]

Hi

On our boat a 5.3m Humber with a 90Hp 2 Stroke outboard. Aging Youth uses a 19inch S/S Laser II when trimmed right out and at WOT setting we maxed out at 5800rpm and 40knots recorded on the GPS. Just Ask Whiteshoes who was parallel with us on the last littlehampton cruise.

I know Mike C is hasving the same problem with prop selection and it is a lot of trial and error if you can afford it.

Good Luck.

[Hightower]

Would have thought that if you uprated your prop to a SS one of the same pitch your revs will drop, you could increase this a little by running the outboard at a greater height but I dought that you will increase revs beond what you've got. I think a smaller pitched SS one will be a better bet.


Andy

[Erin]

Sounds like you've got space for improvement. I've got a Suzuki 90 on my Prosport which is about 5.85m long and I get a good 35 knots with four adults in a smooth sea. Don't know the prop size but will be able to tell you later tonight after I get the boat out the water!

[Ribfisher]

Thanks for reply,
Just found somewone who's importing TP .props from the US.
He's got the whole range to testing with.
Erin, If you now the size of the prop give me a sign.

Regards Ribfisher

[Erin]

Hi Ribfisher

Mines a 3 blade 14x19. I thinks that's diameter x pitch.

Keith

[Windchill]

Correct propping is a black art!!

Try these people www.steeldevelopments.co.uk They helped me out with my last RIB, and were not inordinately expensive.

There is actually a good article about props etc on the RIB International site.