Prop needed....

mikew4 · 27 August 2019, 11:11

Time for a new prop.

6.5m XS RIB with 150HP Mercury engine.

Recommendations pls for general purpose use?

Thx !

Last Tango · 27 August 2019, 11:51

Quote:

Originally Posted by mikew4

Time for a new prop.

6.5m XS RIB with 150HP Mercury engine.

Recommendations pls for general purpose use?

Thx !

Is this an F150 four stroke and what's on it just now ?

Iron Dials · 27 August 2019, 12:08

I used to have this boat and engine (assuming 4 stroke).

Started with 19in 3 blade mercury alloy prop, came with boat which was fine.
Changed for Solas Stainless 19in 3 blade, the one with the integral hub.
Hole shot was not as good, so not a water skiers prop, but like yourself I only wanted general use.
At speeds over 20kts performance was better. Boat sat at 27/28kts much more easily and felt more planted in the sea. Top speed in early 40 kt territory.

However..... I now have 4 blade on current boat and wished I tried one on the XS.
Don’t know whether it’s hull or engine making the difference but feels grippier.

What’s on the boat now?

Last Tango · 27 August 2019, 17:36

I'm running with a 19inch Mercury "Tempest Plus" (Vented) on a 6.5 mtr Deep V (24 deadrise)

43kn flat out and the hole shot is awesome.......

Three minutes in....

https://www.youtube.com/watch?v=N0HT8pgZtJw

mikew4 · 02 September 2019, 08:09

OK, got the info on the current prop. Its a Mercury Marine Tempest Plus - 48-825860 19P

Any suggestions for replacement would be gratefully received. RIB is deep-V and from reading I have done this is a good prop for it. However I am far from being a prop expert....

Thx
Mike.

Iron Dials · 02 September 2019, 08:26

What do you want it to do better?
It looks like you're well set up as is.

mikew4 · 02 September 2019, 08:28

Quote:

Originally Posted by Iron Dials

What do you want it to do better?
It looks like you're well set up as is.

Just after opinions in general. I'm quite happy with the current prop, but then its the only one I have ever used so my experience and knowledge of these things is rather limited.

Will talk to a couple of retailers but then you can never really trust what they say as they always try to flog whats on the shelf...

M.

Pikey Dave · 02 September 2019, 08:51

What’s your current WOT rpm?

mikew4 · 02 September 2019, 10:50

Quote:

Originally Posted by Pikey Dave

What’s your current WOT rpm?

What is WOT?

36valley · 02 September 2019, 11:19

WOT. Wide open throttle.

mikew4 · 02 September 2019, 11:36

No idea....and given that the prop is quite chewed up any attempts and doing any measurements are likely futile.

pilotwillie · 02 September 2019, 16:25

Quote:

Originally Posted by mikew4

No idea....and given that the prop is quite chewed up any attempts and doing any measurements are likely futile.

Refurbing your current one would be best first step.

Pikey Dave · 02 September 2019, 18:35

Quote:

Originally Posted by mikew4

No idea....and given that the prop is quite chewed up any attempts and doing any measurements are likely futile.

Knowing your current WOT rpm ( max rpm you can achieve with your normal load & correctly trimmed) and the maximum recommended RPM for your engine (normally around the 5600-6100 rpm mark) is the starting point for deciding what pitch prop to fit. Without those 2 figures, you’re just guessing.

Last Tango · 02 September 2019, 19:10

That engine's Max RPM is 5000-5800.

My F150 with that same prop on a deep V 6.5 Coastine will rev to 5650rpm.
Comfortable margin to maintain warranty.

My revs at 25 knots are 3.5k and that's about where the economy is at it's optimum. (0.75-0.8 litres per nm) the economy starts to drop off noticeably beyond 30 knots.

That prop is the best part of six hundred pounds worth and I doubt you'll get anything better as an all rounder. I changed out a Vengence and fitted a Lazer II which is a decent prop but the Tempest Plus on there now is way better than both of them.

If yours is not too badly chewed I'd try getting it refurbed but don't expect it to be perfect. Any I've had done have been prone to a slight vibration at low speed.

Pikey Dave · 02 September 2019, 19:20

Quote:

Originally Posted by Last Tango

If yours is not too badly chewed I'd try getting it refurbed but don't expect it to be perfect. Any I've had done have been prone to a slight vibration at low speed.

Agreed, Steel Developments can work wonders at very reasonable cost.
https://www.steeldevelopments.net/pr...r-service.html

scottu · 03 September 2019, 22:58

Quote:

Originally Posted by mikew4

OK, got the info on the current prop. Its a Mercury Marine Tempest Plus - 48-825860 19P

Any suggestions for replacement would be gratefully received. RIB is deep-V and from reading I have done this is a good prop for it. However I am far from being a prop expert....

Thx
Mike.

I have that same prop on a xs6.5 with a 150 pro Xs mercury get it refurbished by steel developments

Roflhat · 04 September 2019, 08:10

Streamlined Propeller repairs are equally as good, at around half the price

Pikey Dave · 04 September 2019, 09:52

Quote:

Originally Posted by Roflhat

Streamlined Propeller repairs are equally as good, at around half the price

Useful to know[emoji106]I’ve never heard of them, where are they based?

Roflhat · 04 September 2019, 10:26

Quote:

Originally Posted by Pikey Dave

Useful to know[emoji106]I’ve never heard of them, where are they based?

They're in Lincolnshire