Another.....which Prop!

yoyo · 19 January 2007, 20:49

I have a Tohatsu 70 pushing a 4.85m rib. the standard prop is an ally 15 pitch.

I have been offered the choice of a new 16p or 18p flow tourque hub vengence stainless steel prop.
Which prop do you guys think I should go for?. My main use is cruising, pulling the kids on the doughnut etc. etc.

Ok over to you guys, please be quick as I have got to make the purchase tomorrow.

Jono Garton · 19 January 2007, 21:00

Yoyo

Have you had a word with Tim @ Menai, The Boat Builder should prop test the boat and fit the correct prop for you.

What revs are you getting with the 15 pitch?

Jono

Biggles · 19 January 2007, 21:00

Whats the figures for the boat at the moment and how does it run.

Need figures for WOT. Whats the top speed. Is acceleration good at the moment. Does it over rev etc.

yoyo · 19 January 2007, 21:10

Jono.
I bought the motor seperatly. Tim was good enought to fit the motor to the rib for me at no extra charge but I have fitted the controls etc myself so the motor didnt run whilst at Menai.......

Biggles. To be honest the boat has still not seen the water yet, but I would expect the motor to rev at the max 5850rpm as the rib is quite light ish...

Thanks you guys for the raprid response. Keep em coming!

Jono Garton · 19 January 2007, 21:14

Yoyo

The revs will depend on what prop your running, have a word with Tim to see what props hes fitted before to simular rigs.

Jono

Biggles · 19 January 2007, 21:24

Off the top of my head and without any real world figures I would dismiss the 18 p prop. So its the 15 or 16. As RIBs tend to be light boats for the engine thats going on them I would go for the 16.

Having said that I would follow the route Jono has suggested and badger the boat maker to pick the right one.

Mark Halliday · 23 January 2007, 12:23

YoYo
Just to add another dimesion.............
I changed from a Tohatsu prop to a Yamaha prop on my 140. The difference was staggering.
Both were 19" pitch but the Yam prop gave an extra 2kts and had much more grip from standstill, in turns and on "re-entry".
The other bonus is Yam props are cheaper than Tohatsu ones.

yoyo · 23 January 2007, 14:10

Hey thanks for the replies guys:

I bought the 16 pitch merc vengance prop at the weekend and it aint seen water.

I switched the flow torq hub for my Tohatsooo one and it fits perfect....I managed to get a brand new Fortress anchor of the guy also for 30 quid!!.

I now have a complete "as new" flo-torq hub kit that will fit Mercury/Mariner engines with a 4 1/4 inch gear case and a 15 spline spigot.

£20. If anybody here wants it...

Spike · 26 January 2007, 21:02

Hi,
I have a Ribcraft 4.8 with a Yamaha F60 in build at the moment & was just wondering if anyone has any ideas on the best stainless prop size for this combo & what sort perfomance is achiveable. Any thoughts on this would be great or if you have played with this combo in the past even better.