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Thread: Tunnel/Stinger 75...15% slip seems too much

  1. #11
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    I know what you mean, 23" p, 5600 rpm, 59.5 rpm, 1.86 to 1 gearcase, If my calc. is right that works out to about zero, no.....Impossible, if so, can you Imagine when I put real power behind this wheel? Nah that can't be right.

  2. #12
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    Default Sharpeye Mike what rig are you running?

    What motor and boat?

  3. #13
    Sam Cullis Mark75H's Avatar
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    Quote Originally Posted by sharpeye Mike View Post
    I know what you mean, 23" p, 5600 rpm, 59.5 rpm, 1.86 to 1 gearcase, If my calc. is right that works out to about zero, no.....Impossible, if so, can you Imagine when I put real power behind this wheel? Nah that can't be right.
    Exactly right ... an example where if the speed and rpm factors are correct, the marked pitch must be wrong. At least when it goes this way you can be certain; and you can also make an educated guess on what the correct pitch of the prop really is as well.
    Since 1925, about 150 different racing outboards have been made.


  4. #14
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    Quote Originally Posted by Billsboats View Post
    What motor and boat?
    15"' 75 hp Johnson on a 13' Delta. This is a fresh motor, 15 hours or so.

  5. #15
    Team Member 850cc racer's Avatar
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    i have two props identical, 23 long tube cleavers. only difference one has been thinned one hasnt, the thinned prop does 75mph all day long.

    the thick one was only good for 73.2

  6. #16
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    The 76 stinger I have has of course, the nitro. The prop is correct as the builder is reknown. I feel I need more diameter. But those props are few and far between, just look at all the postings on this website for 12-12 1/2 X 23-24" props folks are trying to hunt down. Not and easy task since they are still running them in classes.
    I would love to try a 12X24 13 spline if there is one out there on a shelf collecting dust. 7200 is about all I want to go, even thouigh it is nothing for this engine after the rebuild.

  7. #17
    Sam Cullis Mark75H's Avatar
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    No, it doesn't automatically mean the prop pitch is correct. Even if I made the prop myself, I'd say it still doesn't work as marked/hammered.
    Since 1925, about 150 different racing outboards have been made.


  8. #18
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    [QUOTE=marchettih2o;116752] But those props are few and far between, just look at all the postings on this website for 12-12 1/2 X 23-24" props folks are trying to hunt down. Not and easy task since they are still running them in classes.
    I would love to try a 12X24 13 spline QUOTE]

    There are plenty of these props available. I own many of them. The problem is nobody that I've responded to wanted to but a prop. They all wanted to try a prop or get information.

    Jeff Titus, and others, builds them new on a regular basis for the SST60 racers.

  9. #19
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    Sounds Great! Please email me what you have in the 12 - 12 1/2 X 24" catagory...three blade solid hub cleaver. Photos would be nice as well
    You can get me Sam, at ggusta@tx.rr.com..thanks, george in Texas

  10. #20
    Team Member 88workcar's Avatar
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    They just had a 23p on ebay, buy it now for 150.00. I have the guy saved if you want it, it went off unsold two days ago.
    Helping folks out around the globe.

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