Wanted 11.1 x 14 SS prop

henryfreston · 05 May 2014, 15:43

looking for the above to fit a tohatsu 50hp

Edit: just checked I need a size down in pitch if i am moving from aluminium to SS, is that right? in that case I need a 11.1 x 12p

Nos4r2 · 06 May 2014, 03:17

Tried it on the boat yet? If not, don't do anything til you've got an accurate WOT RPM reading.

For what it's worth, I wouldn't bother with an SS prop-it'll be so fast propped correctly with an aluminium prop that you won't need to look for extra performance and the gearbox takes a lot of load if you hit anything with an SS prop. There's a lot of crap floating in the Severn!

henryfreston · 06 May 2014, 07:37

Quote:

Originally Posted by Nos4r2

Tried it on the boat yet? If not, don't do anything til you've got an accurate WOT RPM reading.

For what it's worth, I wouldn't bother with an SS prop-it'll be so fast propped correctly with an aluminium prop that you won't need to look for extra performance and the gearbox takes a lot of load if you hit anything with an SS prop. There's a lot of crap floating in the Severn!

well this is the problem i've got- being an absoloute idiot

i trimmed the engine down too early because before I had a sib so you could drop the engine down earlier. I then scaped the prop over the hard sand bed, bending a taking the paint off it. With the bent prop I got 5650rpm at WOT.

So I thought instead of reconditioning/buying a new prop I would just get a SS one? But you reckon there's not much point? So maybe I just stick with a ally one but get mine reconditioned- propeller solutions do it for £38.

Cheers henry

henryfreston · 06 May 2014, 08:20

Read one of your earlier posts that you used a 10 3/4 x 14 prop and got 39 knots WOT. I know someone who can lend me one this size but not sure if honda and tohatsu will fit the same props? I know he had it on a mid to late 90s honda 4 stroke and mind in a tohatsu tldi.

Roflhat · 06 May 2014, 12:52

solas stainless steel Outboard Engine propeller 12pitch. | eBay

might be what your after? not mine just came across it

Nos4r2 · 06 May 2014, 12:58

Quote:

Originally Posted by henryfreston

well this is the problem i've got- being an absoloute idiot

i trimmed the engine down too early because before I had a sib so you could drop the engine down earlier. I then scaped the prop over the hard sand bed, bending a taking the paint off it. With the bent prop I got 5650rpm at WOT.

So I thought instead of reconditioning/buying a new prop I would just get a SS one? But you reckon there's not much point? So maybe I just stick with a ally one but get mine reconditioned- propeller solutions do it for £38.

Cheers henry

Everyone bashes their prop at some point in shallow water

You really need the prop to be perfect to get a proper WOT RPM reading. However, a stainless prop will transfer a hell of a lot more shocks to the gearbox if you hit something and you really don't want to be changing gearboxes.That's aside from how crazy quick an SR4 with a 50 is when propped correctly on any prop.

Quote:

Originally Posted by henryfreston

Read one of your earlier posts that you used a 10 3/4 x 14 prop and got 39 knots WOT. I know someone who can lend me one this size but not sure if honda and tohatsu will fit the same props? I know he had it on a mid to late 90s honda 4 stroke and mind in a tohatsu tldi.

Yeah I did use that prop, but that was on a Mariner 50. Your TLDI would have to have exactly the same gear ratio and recommended WOT RPM to replicate my results though. Every prop/motor/hull/owner lardiness index combination gives different results.

Landlockedpirate · 06 May 2014, 13:02

I'm with Nos4R2, unlikely to get any significant performance advantage with a stainless prop. After years of testing and a lot of money spent on props, I have come to the conclusion that OE prop is usually the best (+ or - 2") in a leisure application.

The other issue with stainless is when you bash it. You hit the bottom with an ali prop the worst case is a new prop ( £80?) or more usually a rework for £30. If you hit the bottom with a stainless prop the worst case is a new gearbox

Roflhat · 06 May 2014, 16:00

I'd go stainless every time, it's a trade off either way but there are performance gains to be made. The easiest way to get more performance out of your boat is just changing to a better prop.

henryfreston · 06 May 2014, 16:04

Quote:

Originally Posted by Nos4r2

Everyone bashes their prop at some point in shallow water

You really need the prop to be perfect to get a proper WOT RPM reading. However, a stainless prop will transfer a hell of a lot more shocks to the gearbox if you hit something and you really don't want to be changing gearboxes.That's aside from how crazy quick an SR4 with a 50 is when propped correctly on any prop.

Yeah I did use that prop, but that was on a Mariner 50. Your TLDI would have to have exactly the same gear ratio and recommended WOT RPM to replicate my results though. Every prop/motor/hull/owner lardiness index combination gives different results.

i know it has the same gear ratio so maybe i will just have to have a play with a few props. I will try a 14" as someone I know has one I can use and he also has a 12", then whilst I'm trying them my 13" can be repaired and I can compare.

I mean my boat didn't feel slow, but it certainly wasn't as fast as I was expecting it to be, I was at WOT i i was not chine walking and it wasn't really fast. So I will just have to have a little play around and see what happens I suppose.

henryfreston · 06 May 2014, 16:06

Quote:

Originally Posted by Landlockedpirate

I'm with Nos4R2, unlikely to get any significant performance advantage with a stainless prop. After years of testing and a lot of money spent on props, I have come to the conclusion that OE prop is usually the best (+ or - 2") in a leisure application.

The other issue with stainless is when you bash it. You hit the bottom with an ali prop the worst case is a new prop ( £80?) or more usually a rework for £30. If you hit the bottom with a stainless prop the worst case is a new gearbox

Quote:

Originally Posted by Roflhat

I'd go stainless every time, it's a trade off either way but there are performance gains to be made. The easiest way to get more performance out of your boat is just changing to a better prop.

I suppose there is pros and cons of both. I think I will first prop it correctly with an ally prop then MAYBE cahnge to a stainless if im not happy with the speed or i cant pull a skier up.