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Old 08 November 2012, 03:58   #1
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Johnsorude 4Hp (1970s) Plastic prop?

Could someone with one of these post a pic of the prop?

I noticed last night as I was messing about at the transom that my prop blades at the tip the blade surface appears to be pretty well aligned with an imaginary disc perpendicular to the shaft - if that made sense?

I've always thought it was a little lack lustre, which I had originally put down to it's age, but I am now beginning to think it might be the plastic prop has warped with age.

Can anyone post a pic of their prop? It's the 'Rude / Johnson twin pot 4 from C. 196Oatkake - C. 1974.

Thanks.
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Old 08 November 2012, 04:43   #2
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Will try tonight. I have an old 70's white j'son. Not sure if a 3 or 4 as all decals gone. It has a black plastic prop though.
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Old 09 November 2012, 11:03   #3
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Are the blades separate from the hub?

Some plastic props have blades that are adjustable for pitch; could it be that the detents are gone and the blade has slipped?

jky
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Old 09 November 2012, 16:55   #4
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You can get ally props for those, and the 2hp plastic prop also fits them.
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Old 09 November 2012, 19:19   #5
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Quote:
Originally Posted by Nos4r2
You can get ally props for those, and the 2hp plastic prop also fits them.
Would it make it any quicker?
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Old 09 November 2012, 19:20   #6
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No, solid lump.

Nos.
Yeah, got one of them, but even lower pitch than the one on the 4, its the blade shape doesn't look right on the 4, especially alongside the 2. I did wonder about alloy, good to know its out there.
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Old 09 November 2012, 19:22   #7
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Quote:
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Would it make it any quicker?
It's not so much quicker as a 4 with the same-ish effective grunt as the 2 it replaced.
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Old 19 November 2012, 17:06   #8
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A little later than planned, but here are the pics:

White gearcase is the 2HP - Blades the sort of shape you would expect - a curve on the tip to throw the water backwards.

Blue gearcase is the 4 - pic doesn't show it too clearly (trailer on axle stands at the mo so not easy access) - but when compared to the prop on the 2 it has a much "flatter" profile. (and the pic doesn't show it too well, but that top blade actually is convcave whenyou look at it form the front (as we are now) - and the cuurve isn't even across the three blades)
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