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  1. #31
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    Preview

    Things went well today. Mostly. I got the bow up and hit 54 mph @5700rpm. 50mph @5100 w/first mate aboard. All I did was lower the engine back down 1/2" to stop the venting. I did the seat swap saving about 100 lbs. I sat about a foot further back. And I tried a different prop that was supposed to be equal to the last one I tried 12 3/4 x 21. I guess it was the combination that gave me the results. I got it to where it just started to chine walk. But... I dinged the prop. Welcome to the Willamette river in debris season! It didn't affect my top speed, but it was only the second time it was used. Cupped one of the blade a little bit. Oh well, it was a good day.��

    Now I can get a SS prop and Power trim and shoot for 60!
    Attached Thumbnails Attached Thumbnails C969914B-8E6B-40DB-9982-AE5D9D004207.png   D2DDA576-0092-496E-B0C6-13DF82F54B90.jpg  
    Last edited by Spaceman Spiff; 03-18-2023 at 08:09 PM.

  2. #32
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    I got the standard stainless prop (12.75 x 23) and went out. I hit 52 with more to spare. But it was choppy and I had to back off. The boat wasn't handling it well. When I got home I pulled up the floor in the front and it's all rot. Those giant seats were hiding it. It has a keel, but no stringers and it's all soaked wood. Might have chop it up and dump it. The rear of the floor has been redone and seems solid. It just didn't feel solid bouncing off waves. I'll have to see if it's repairable. Sigh

  3. #33
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    After pulling the LU, there's just six easily accessible bolts.
    Attached Thumbnails Attached Thumbnails 9BD73F6D-9800-47DE-A55F-89D217A97425.jpg  

  4. #34
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    After fixing the keel and floor, I decided to go the whole 9 yards and do a full sand, primer and paint on the whole thing. Then gauges, carpet and new steering. I've spent so much time painting it that I have forgotten what it was like to drive it. Been taking the Larson out in the meantime. So I'm sure glad to have this thread to refresh my memory of where I was at.

  5. #35
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    Finally back on the water. Feels really solid and stable.
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  6. Likes David - WI liked this post
  7. #36
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    This last prop that I have (OMC 12.75x23) is getting me 55mph at 5200rpm in the fourth trim hole. It gets a little squirrely at that speed. The ass end feels like it wants to jump sideways a foot or two without notice. I guess that's called chine walk. If I put it in the third hole, it tops at 52mph and is a whole lot more mild-mannered. I think I'll leave it there. I appreciate all the help. I'm just gonna add a Hot Foot and call it done.

  8. #37
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    I redid the original seat bases using the existing cushions and upholstery. It came out good. But the extra 100 lbs or so cost me 4 mph! Less bow rise. So I'll be running the polys until i need seating for more than two.

    The boat is really solid now from all the extra rigidity the float foam added under the floor. I've been pounding on it in rough water and it's taking it like a champ. I love it!
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  9. #38
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    Nice work on your project. Look for a shooter prop, they are a 4-blade performance OMC prop that you can find used pretty cheap. If you have a passenger and you're looking for top speed and balance, have them sit opposite of you in the back corner.

  10. #39
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    Thanks. I definitely noticed that the boat sits flatter side to side flying solo with these seats. I think I'm settled on this prop. I have a pretty decent hole shot and top speed is now 57mph(@5100) with non-E 93 octane and the Empi seats. That's plenty for this boat without a pad.

  11. #40
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    So what do ya think might be the best choice for top speed?

    13.5 x 22 Raker 3 blade
    13.25 x 21 Stiletto 3 blade
    or 12.5 x 23 Shooter 4 blade

  12. #41
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    Another option I see is Powertech 14x22 4 blade

  13. #42
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    So I got the Raker 13.5x22 and went out and hit basically hit the same speed/rpm as with the 21P aluminum and 23P SS. 53mph at 5000 rpm. It did feel a little squirrelier though. Should I try raising up the motor? This is a surfacing prop isn't it? Or maybe less pitch to get the rpms up? I did just try a 12.75x21 SS prop over the weekend and only hit 50 mph at 5200rpm. But I did have a passenger. How much faster can I expect to go with a 1976 115hp outboard, regardless of how bad the chine walk is?

    Boyesen reeds perhaps?

    I did buy this prop with the intention of using it on my Larson in the other thread. So If I can't get it to work well on this boat, it's no biggie.
    Last edited by Spaceman Spiff; 10-11-2023 at 08:36 PM.

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