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  1. jakec

    Speed Plateaus at 5200rpm

    Texas Mark, you are reading from and older post, but I later corrected what I had heard from the dealer. It was that they reached max RPM at only 3/4 throttle. So the opposite of lugging, there was not enough resistance at the prop. That is why they went to the 21. jlh3rd, yes, that is what I'm...
  2. jakec

    Speed Plateaus at 5200rpm

    I did some research and it seems that its not totally conclusive but they think that smooth is better, but it matters less and less the larger the boat and the faster you go. I wouldn't think it can account for the loss of 20-25% off of top speed.
  3. jakec

    Speed Plateaus at 5200rpm

    Here is a pic of the texture.
  4. jakec

    Speed Plateaus at 5200rpm

    So do you think the prop I have is correct and I am really losing close to 20% of my top speed based on having a rough bottom?
  5. jakec

    Speed Plateaus at 5200rpm

    Here are a couple more pics of my boat. The transom progress pic shows the hull shape well. The pic in water is just a nice pic ;) Another thought that crossed my mind is that the previous own had rolled on the paint on the underside of the hull, so there is a large area that is rough. Any...
  6. jakec

    Speed Plateaus at 5200rpm

    Can you explain what you are doing here? 2.59/2 x 17 = 22 pitch My boat certainly weighs more than when new, but that's because I did a full restoration of the stringers (no foam used), floor, and transom. So those items may have added a few hundred lbs. to the boat I'm sure. But the boat I'm...
  7. jakec

    Speed Plateaus at 5200rpm

    I had to go back in my texts and I see that I was remembering incorrectly. So here is some additional info to my previous comment. This is what the dealer said to me after the sea trial: "I tried a 19P and going to a 21. Got the boat to 34mph but I hit the rev limiter at 3/4 throttle." Also...
  8. jakec

    Speed Plateaus at 5200rpm

    Thanks everyone for the responses. Deep in winter now so I haven't thought about the boat in a while. I do have a good prop shop near me. I will probably give them a call before the season gets started. I just wanted to get a basepoint from the forum so I don't end up buying 3 props from them...
  9. jakec

    Speed Plateaus at 5200rpm

    I just repowered with a new Suzuki 115. The dealer gave me a 21p 3 blade prop. The boat is a 1959 Dorsett San Juan. I previously had a 1977 Mercury 115 and a safe/comfortable cruising speed of 29mph, and a top speed of 31mph (but with porpoising/reduced control). With the new engine the...
  10. jakec

    1150 Link & Sync Question

    Just wanted to update anyone still interested in this saga. I ended up filling the holes in the transom from the old outboard and fixing the problem with the radius at the bottom. Then I did a bunch of shopping around and settled on a Suzuki 115. I will be posting in the propping forum shortly...
  11. jakec

    1150 Link & Sync Question

    I see, I had the same thought, that since the newly added material wouldn't be attached to the 4-5 layers of cloth on the exterior of the transom, it's actual contribution to the structure would be minimal. Looking at the yamaha mounting It looks like I could use one of the middle holes, or even...
  12. jakec

    1150 Link & Sync Question

    More is always better. I was advised by a professional restorer on what types of fabric to use and what width, number of layers, etc. It is 17oz stitched 45* bias cloth, 2 layers in all places. Held down with west system epoxy. In any case, it's too late to change it now! Ha. One reason i'm...
  13. jakec

    1150 Link & Sync Question

    BTW if you are interested at all, here are the build photos. Imgur
  14. jakec

    1150 Link & Sync Question

    One reason I was interested in the 115 is because it is very light weight. The the yamaha f115 only weighs 385, whereas the f150 weighs 485! Do you really think I'd be disappointed with a 115? I don't even plan to carry a skier, I only want to cruise at a reasonable speed (30mph is plenty). Here...
  15. jakec

    1150 Link & Sync Question

    When I originally started the thread there was two posters Jim and chris who gave me a lot of advise on the transom spray I was getting. I'm just posting an update and maybe they will reply. My main questions today are 1. do I need to extend top of transom and 2. should I stick to 115 hp or go...
  16. jakec

    1150 Link & Sync Question

    Ha ha yes true. Well I don't know how this relates to my original question anyways.
  17. jakec

    1150 Link & Sync Question

    Near flat at the back with a very deep V at the bow.
  18. jakec

    1150 Link & Sync Question

    It is a planing hull. not sure what you mean about the "generic mercury/quicksilver unit" ?
  19. jakec

    1150 Link & Sync Question

    It is a 20" transom. However when I built it I didn't take into account the angle, so the planar surface is 20", but it's actual height is less than that, more like 19". So when I plopped the 1150 down on it, the engine was about 1.5" too low.
  20. jakec

    1150 Link & Sync Question

    Hey guys, unfortunately the beautiful 1150 that you helped me get going in the spring had a problem with the exhaust baffle and/or lower crank seal towards the end of this season. It was sucking water into the bottom 2 cylinders. Luckily I noticed the problem right away and go the boat out of...
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