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Old 10 August 2018, 00:05   #1
Country: UK - England
Town: Lymington
Boat name: Farfetched
Make: Solent Ribs
Length: 6m +
Engine: 150hp Suzuki
MMSI: 235021048
Join Date: Apr 2004
Posts: 949
Prop Novice - Suzuki 3x16x21 5R

I have never played with a different propellor. I have an XL shaft Suzuki 150 which is splashing up water and I am a bit low in the revs I can achieve at WOT unless I am trimmed out quite a way.

A suggestion to avoid building up the transom and raising the A frame has been to try different prop or props.

This may be pissing in the wind and in reality I might have to accept the hassle of major works on transom and A frame. Bit since swapping propellor is low hassle, should I try?.

I currently have the prop supplied with the engine by the guys who re-engined her.

I am writing this new thread just in case someone who is a prop expert is on here who is different from the helpful and kind transom and engine height experts who have most generously contributed to the main current thread.

The prop is brand new Suzuki and marked 3x16x21 5R. I am no an expert so I have no idea if that is the right or wrong prop.... Not even sure I know what the numbers mean....

Any input greatly appreciated. Thanks. Bruce

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Old 10 August 2018, 03:21   #2
Last Tango's Avatar
Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Mariner F150
MMSI: 235107505
Join Date: Mar 2013
Posts: 1,417

There's no point in bu@@ering about with props until you get the engine setup issue sorted.
As a stating point you need to know where your max revs are coming in on a properly trimmed boat/engine and you're nowhere near that at the minute. Propellers are expensive.

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Old 11 August 2018, 15:55   #3
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,901
Without reigniting the debate about your engine/transom I doubt a prop change is going to sort the big issues but will tune the final solution. The numbers mean it is a three blade prop, 16Ē in diameter and that in a perfect world each turn of the prop pushes the boat 21.5Ē forward (the pitch). And the R says itís a normal prop (not one for counter rotating twin).

Is that the standard issue prop for the engine? It seems quite big. Is it aluminium?

The black art stuff with props though is not the pitch and diameter stuff - itís the shapes, materials etc... in an ideal world the person who rigs your boat knows his props and has a range to pick from to get you an optimal solution. I think itís perhaps an undersold aspect of what dealers can offer and the value it can save over messing with multiple options, rather than stack em high, sell em cheap.
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Old 12 August 2018, 15:23   #4
Roflhat's Avatar
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Ceasar Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 848
You could look into hydraulic jacket plates, would make engine height and propeller tuning very straight forward. Just be careful as they put some extra stress on the transom, the less set back the less stress on the transom
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