Sportwin Prop

[slim60]

I just aquired a ’56 Sportwin and I’m concerned about the prop. The blades look a little narrow to me and the numbers are worn off. The last thing I want to do is over rev.

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[garry-in-michigan]

The prop that came with it was a 277585, 9" diameter 8" pitch – superseded by 277595 same diameter and pitch, but not weedless.

[garry-in-michigan]

My advice is always use the prop that has the engine turning around 4,500 RPM wide open with your normal load.

[fisherman6]

I’m no expert so take this for what it’s worth. I do have a ’55 QD with the semi weedless prop and they start out pretty narrow. Other than being green, it doesn’t look too much different than yours. That one looks a bit worn, but I doubt you will have any over rev issues. A tach is the only way to know for sure, but I doubt you’ll have a problem. I would not be afraid to clean the nicks up and run it. That is assuming, of course that the diameter is correct for the 10hp. I can’t actually tell from the picture without a tape or scale of some kind. Hopefully someone with more experience with them will either confirm or reject my statement but that’s my 2 cents.
-Ben

OldJohnnyRude on YouTube

[frankr]

Looks pretty normal to me.

[Steve D]

I like using that style prop over the wider blade for my 10 horse motors up to ’57. It’s been a while since I checked but I’m pretty sure the white one is also 9 X 8. I’ve tried both and the narrower blade seems to reach max. rpm and plane the boat faster. I’ve been meaning to get a tach, but I’m just going by ear and knowing the motors on my boat the way I do. There’s no worry over-revving. The ’55 Johnson 10 hp in the video is wide open with the green prop.
http://vid985.photobucket.com/albums/ae … deopen.mp4
picture share

[slim60]

Thank you all. I’ll clean up the nicks and run it.

[Mumbles]

Nothing wrong with those style props at all.

Here’s the same prop on a ’56 QD and it pushes the 14′ tinner quite well.

https://www.youtube.com/watch?v=fiWr-blRD5U

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