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Thread: 12' Cat Build

  1. #91
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    Some picks of the interior layout.

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  3. #92
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    Deck is down and the dash is in, after a lot f sanding and finishing work I should have something I can bolt the 60 to.
    The steering has been mounted and cable routed, a bit of a pain as its left hand helm.
    Going to the boat show in a couple weeks, need insruments (any suggestions welcome) also need to figure out seats.
    Any input on first prop to try would also be much appreciated, the one on the motor is not in great shape. The prop is MI Wheel Vortex 13x19, maybe a good starting point but this is all new to me.

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  5. #93
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    I like the lines of the hull. Sharp looking. Definitaley has the Mini-boat look, kinda like a caricature drawing.

    What year is the 60hp? Assuming it's the Johnson in the background. We can give you a good idea of prop if you tell us the gear ratio of the lower unit.

    If it's not too late, I suggest putting your battery and fuel tank in the bow. I made that mistake with mine - but I also have close to 400 lbs hanging on the back of mine with the 115hp, hydraulic steering, and the jack plate.

  6. #94
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    Quote Originally Posted by home made tunnel View Post
    I like the lines of the hull. Sharp looking. Definitaley has the Mini-boat look, kinda like a caricature drawing.

    What year is the 60hp? Assuming it's the Johnson in the background. We can give you a good idea of prop if you tell us the gear ratio of the lower unit.

    If it's not too late, I suggest putting your battery and fuel tank in the bow. I made that mistake with mine - but I also have close to 400 lbs hanging on the back of mine with the 115hp, hydraulic steering, and the jack plate.
    1992 Johnson J60LENE.
    Weight 254lbs
    Gear ratio 2.42
    Wet rpm 5000 to 6000 rpm

    The battery will be in the back, the fuel tank will be portable to start off.

    The whole package should be in the 750 to 800 lb range, rough estimate until it gets weighed.

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  8. #95
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  12. #97
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  14. #98
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    Looking great! ALmost there! It will be ready for boating season. Come down to new England and lets do some river running and a photo shoot of home made plywood mini cats haha.

    So with some guess work.... I'm going to assume a 50mph top speed. using the Mercury prop slip calculator ( https://www.mercuryracing.com/prop-slip-calculator/ )

    at 2.42 gear ratio, 6000 peak rpm, 50mph, and an IDEAL 7% slip ratio... that calculates to a 22.9 propeller pitch. (22 or 23).
    all things the same... but 40mph top speed.... it gives you 18.32 for propeller pitch.

    If you find any CHEAP prop from 18-21 pitch, that would be a great starting point. Once you have actual GPS speed, and an RPM... you can get a much better guess for ideal prop pitch.

    So, 18-21 pitch, whatever you can find on the cheap as a base-prop. 17 pitch would probably be too low. Probably tach out the motor before peak speed.

  15. #99
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    Quote Originally Posted by home made tunnel View Post
    Looking great! ALmost there! It will be ready for boating season. Come down to new England and lets do some river running and a photo shoot of home made plywood mini cats haha.

    So with some guess work.... I'm going to assume a 50mph top speed. using the Mercury prop slip calculator ( https://www.mercuryracing.com/prop-slip-calculator/ )

    at 2.42 gear ratio, 6000 peak rpm, 50mph, and an IDEAL 7% slip ratio... that calculates to a 22.9 propeller pitch. (22 or 23).
    all things the same... but 40mph top speed.... it gives you 18.32 for propeller pitch.

    If you find any CHEAP prop from 18-21 pitch, that would be a great starting point. Once you have actual GPS speed, and an RPM... you can get a much better guess for ideal prop pitch.

    So, 18-21 pitch, whatever you can find on the cheap as a base-prop. 17 pitch would probably be too low. Probably tach out the motor before peak speed.
    Thanks for the prop advice, I will try and find a 19 and 21 p to try. I wasn't going to put a jack plate on it but I feel like it will need one, but now I'm worried about low water pressure.
    You said you had one on your tunnel, just wondering about how much setback? Trial and error I guess, thinking 6 inch or so but was not planned for originally.
    Just trying to get as much installed and mocked up before I tear it down for final finishing.
    Would be great to get together and compare the two 1 of 1 boats, see if mine floats first.

  16. #100
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    I haven't had any issues with low water pressure. Seems I can't get on plane before I run out of water pressure. Like if I raise it too much, I blow out / cavitate before even getting on plane. Soooo never had a low water pressure issue yet.

    Here's the manual jack plate I have - Only 26 lbs but is nice for variable mounting heights. Also, if you ever want to pull the motor off the boat, it's WAY easier pulling it off the jackplate, than pulling the bolts out of the transom.

    https://bobsmachine.com/product/conv...te-200-hp-max/

  17. #101
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    Quote Originally Posted by home made tunnel View Post
    I haven't had any issues with low water pressure. Seems I can't get on plane before I run out of water pressure. Like if I raise it too much, I blow out / cavitate before even getting on plane. Soooo never had a low water pressure issue yet.

    Here's the manual jack plate I have - Only 26 lbs but is nice for variable mounting heights. Also, if you ever want to pull the motor off the boat, it's WAY easier pulling it off the jackplate, than pulling the bolts out of the transom.

    https://bobsmachine.com/product/conv...te-200-hp-max/

    I am going to set the engine back 6" to 8", looking at the TH marine manual jack plate.
    What height did you eventually find worked best for your boat?
    I will start low and work my way up until it runs out of water.

  18. #102
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    I had to straighten out the skeg and smooth out some dings and scratches. To be expected from a motor off an old runabout.

  19. #103
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    I found 2 props to try out. OEM re manifactured,
    Both are 12 3/4" one 21P and one 23P.......price was right.

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  21. #104
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    Quote Originally Posted by Hoffer View Post
    I am going to set the engine back 6" to 8", looking at the TH marine manual jack plate.
    What height did you eventually find worked best for your boat?
    I will start low and work my way up until it runs out of water.
    I didnt' even set it back that far. I believe its set around 2.5" of setback. That manual jackplate can be flipped into several different positions.
    For height, a good starting point is even with the bottom of your sponsons. I've gone up to 3" higher than the bottom of the sponsons, it stopped some porpoising but didnt net me much more speed.
    You'll find the higher you go, the harder it is to get on plane, and the less your trim has any effect. I don't think it will matter too much, as it wont be a 100mph boat anyway.

    So my 3rd picture, you can see the jack plate almost maxed out. That's about 3" above pad height. Since this picture was taken, i've moved the engine to the bottom bolt holes (most height out of engine clamp bracket), and brought the jack plate back down. I'm not sure if your motor even has various mounting holes. Either way, you've got a lot of room for adjustment with a jack plate.
    Last edited by home made tunnel; 01-23-2020 at 10:16 PM.

  22. #105
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    Quote Originally Posted by home made tunnel View Post
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    I didnt' even set it back that far. I believe its set around 2.5" of setback. That manual jackplate can be flipped into several different positions.
    For height, a good starting point is even with the bottom of your sponsons. I've gone up to 3" higher than the bottom of the sponsons, it stopped some porpoising but didnt net me much more speed.
    You'll find the higher you go, the harder it is to get on plane, and the less your trim has any effect. I don't think it will matter too much, as it wont be a 100mph boat anyway.

    So my 3rd picture, you can see the jack plate almost maxed out. That's about 3" above pad height. Since this picture was taken, i've moved the engine to the bottom bolt holes (most height out of engine clamp bracket), and brought the jack plate back down. I'm not sure if your motor even has various mounting holes. Either way, you've got a lot of room for adjustment with a jack plate.

    Thank you. Just trying to figure out how much adjustment I may need, starting point to mount the jack plate. The motor has multiple mounting holes as well so there should be lots of room for adjustment. I will most likely order the TH marine 5.5" manual plate.
    Starting finishing work this weekend....time to get the shop dusty again.

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