Zincs needed for Roughwater 33

[wsmac]

Hello all!
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I have someone who wants me to replace his zincs on a Roughwater 33.
Just seeing if anyone here knows the zinc size for this boat... figuring it's a prop shaft zinc, because all the pics I can find on the internet don't show any other zinc placements.. that I can see anyway.
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Just trying to avoid having to dive twice.
Thanks!

[Har2015]

May not be able to avoid a second dive, but more times than not you might find the shaft to be somewhere between 1" - 1-1/2".
1" being the most common.

[wsmac]

Originally Posted by Har2015

May not be able to avoid a second dive, but more times than not you might find the shaft to be somewhere between 1" - 1-1/2".
1" being the most common.

yeah... I find most boats up to around 30-ish feet to be prop shaft of 1"
Seems to me I read somewhere the Roughwater had an 1 1/2" shaft though.
If the owner is still around today... I may see if he'll open up and let me check from inside... never heard of a 'tapered' shaft before so I should be good to go with whatever diameter it is inside eh? lol
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Kinda hate spending money on zincs I won't need... like 2 different style 1 1/2" shaft zincs.
The inch ones I will likely be able to use more often, so a collar/donut or streamline in 1 inch isn't such a bad buy.
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Also.. from the pics I've seen.. not sure these boats take a propnut zinc... until someone who knows, tells me.. or I dive on it and find out on my own.

[Har2015]

Originally Posted by wsmac

yeah... I find most boats up to around 30-ish feet to be prop shaft of 1"

Seems to me I read somewhere the Roughwater had an 1 1/2" shaft though.

If the owner is still around today... I may see if he'll open up and let me check from inside... never heard of a 'tapered' shaft before so I should be good to go with whatever diameter it is inside eh? lol

.

Kinda hate spending money on zincs I won't need... like 2 different style 1 1/2" shaft zincs.

The inch ones I will likely be able to use more often, so a collar/donut or streamline in 1 inch isn't such a bad buy.

.

Also.. from the pics I've seen.. not sure these boats take a propnut zinc... until someone who knows, tells me.. or I dive on it and find out on my own.

When I make a zinc inventory order I always get a few extra 1" shaft zincs. Plus I keep an inventory of different types and sizes on hand.
So that helps. But my inventory consists of various zincs that I have used in the past on many boats that I dive on.

Checking from the inside isn't a bad idea if you're not wanting to make a quick 2nd dive or purchase a couple different zincs. Hopefully he doesn't have a prop zinc that you don't know about. Otherwise you'll be making a 2nd dive after all.

[wsmac]

I originally resurrected a dead thread about these and similar boats not sure anyone would notice... but one person did!
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Originally Posted by mrp0006

I have a 1979 RW33, my prop shaft is 1 1/4". You should be able to confirm that by measuring it aft of the coupler, underneath the cockpit sole. I use a limited clearance collar zinc. I also have a flat plate zinc attached inside the aperture, above the prop shaft, wired to the cutlass bearing.

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Posted a great pic too!
I'm stoked... just one of those great moments on the internet
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[wsmac]

also should mention all the great info and help Har2015 has been sending me!

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Thanks ya'll!

[boatpoker]

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[/QUOTE]

Another prop with the jam nut in the wrong position.

[Har2015]

Originally Posted by wsmac

also should mention all the great info and help Har2015 has been sending me!



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Thanks ya'll!

Anytime! [emoji1303]

[michaelratinter]

Originally Posted by boatpoker

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Another prop with the jam nut in the wrong position.[/QUOTE]

The thinner nut is the jam nut, isn't it? How dhould it be positioned?

[Har2015]

Originally Posted by michaelratinter

Another prop with the jam nut in the wrong position.

The thinner nut is the jam nut, isn't it? How dhould it be positioned?[/QUOTE]



This has been a subject of great debate for a long time. To many, myself included for a long time, the thin nut is the jam nut. However, I started to research this subject and found that the "jam nut", or thin nut goes on first followed by the large nut.

When installing the prop, use the large nut to tighten and seat the prop on the shaft - then remove it. Install the thin nut followed by the large nut (used as the jam nut) because it has more thread surface area and can take most of the load.

This method is also in accordance with ABYC standard P-6 and SAE standard J755.

[boatpoker]

Not much room for debate .....ABYC calls for the thin nut to be against the hub as does ABS, SAE, CE, Det Norske Veritas and the American Machinists handbook. I have never seen an authoritative source advise otherwise.

[michaelratinter]

Har2015, boatpoker,

Thanks! Learned something new today.

Rick