building a PM38 a few questions

Discussion in 'Boat Design' started by rocco611, Jul 30, 2020.

  1. rocco611
    Joined: Jan 2019
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    Location: Madera Ca

    rocco611 Junior Member

    Here are some more pics
     

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  2. Squidly-Diddly
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    Squidly-Diddly Senior Member

    WOW, I hope you are going to keep at least the top deck in natural wood varnish of some kind.
    I'm thinking the thing to do would be first apply a dark brown epoxy over everything sorta like grouting tile, to fill all the joints and gaps and make everything 'pop' like black outlines on cartoons, then a much lighter clear amber finish on the wood's surface, but I don't know about fine wood finish, much less about on boats.
    You're going to be outclassing boats costing over a million in looks, and lets face it thats a big part of certain aspects of boating. Plus it looks like it will be still a very practical multi-purpose all around boat.
    Don't be surprised if some rich dude wants to buy it and doesn't want to take "no" for an answer.

    Plans seem to call for simple plywood on deck but you did some sort of strip. What you do exactly? How keeping the thin strips together?
     
  3. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    I decked the boat with 1/4 plywood then epoxied the 3/16x 2 strips down ,holding them in place with screws in the gaps and fender washers, till the epoxy set. the dark mahogany around the edges is some mahogany I had stored since high school over 40 years ago . the light colored mahogany is Philippine mahogany , which isnt really mahogany at all, learning a lot about wood as I go. I am going to finish the deck with automotive clear and caulk the seams, I was thinking white automotive seam sealer, but now that you mention black I will try a test piece that way and see how it looks. thought about mixing some black color into epoxy and adding some metal flake. I plan on painting the boat a dark candy blue with small flake in the base coat. if someone wants to buy it, I would be fine with that. after buying an outboard I would be pleased if I just broke even, on this project .I plan on building an inboard runabout when I retire next year out of sapele , looks more like mahogany than the Philippine mahogany I have been using. I also hope to have a large band saw by then, which will make re sawing boards much easier.
     
  4. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    update: I have a new Yamaha F25 on order from a dealer in Florida . they expect it to ship from the mfg in April. Local Yamaha Dealer didn't want to be bothered with ordering the motor and controls "we sell boats with motors on them" I needed to finish my boat but agreed to do the PDI for $100 , but I would have to wait till they were done with everything else on their calendar . Business must be good.
    I turned the boat over primered and block sanded till I have no finger prints left. did some of the paint work over the weekend, sealer, silver base coat, metalflake and clear. I still need to sand it again with 600 then candy Aqua mid coat and more clear.
    image000001.jpg
     
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  5. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    just finished the paint today. silver metal flake acrylic urethane under aqua blue candy , house of kolor show clear.
     
  6. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    pics
     

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    fallguy and Lloyd Too like this.
  7. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    finished building the trailer, boat fits it pretty well, finished sanding the deck, ready for stain then clear coat
     

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  8. comfisherman
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    comfisherman Senior Member

    Spectacular job!
     
  9. rocco611
    Joined: Jan 2019
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    rocco611 Junior Member

    20210606_165357.jpg 20210606_095213.jpg stained part of deck with aniline Dye then shot house of Kolor show clear over it. clear bubbled like crazy tiny air bubbles everywhere, strange, will be sanding it tomorrow, I may use marine varnish instead going forward.
     

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    Last edited: Jun 7, 2021
  10. rocco611
    Joined: Jan 2019
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    Location: Madera Ca

    rocco611 Junior Member

    I used the same clear on the hull without issue, not sure why I would get solvent pop on the deck.
     
  11. fredrosse
    Joined: Jan 2005
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    fredrosse USACE Steam

    Great Job, far beyond the skills expected for a new boat builder.

    Can you update the 1962 publication as far as the old statements....

    38 hours build time??

    $38 materials cost??

    200 pounds boat weight??
     
  12. Scuff
    Joined: Nov 2016
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    Scuff Senior Member

    Wow boat looks fabulous. Great job thank you for sharing. How do you apply the aniline dye?
     
  13. rocco611
    Joined: Jan 2019
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    Location: Madera Ca

    rocco611 Junior Member

    38 hour build time, I think I could do it in 38hours after having the experience of building one and having the jig and tools I need. To build one per the original plans with no experience, I would say 80 hours. I have about 200 hours in the build most of that was in the paint work and the mahogany deck. fitting the deck to the sheer rail took a lot of time. There is quite a gap at the outside edge of the sheer rail to deck joint. the original plans called for filling the gap between the deck plywood and the sheer rail with thickened epoxy. I ended up making a shim from mahogany . the angle changes from the bow to the stern so it took a lot of time to plane and fit the shim . cost to build the boat today. $600 to $800 . I spent about $1200 on this build, half of that was paint . I calculate the weight at 250 lbs if built with fir and marine plywood. (epoxy , fasteners , hardware, plywood and 25 bd feet of lumber.) I expect my boat will be about 300lbs with steering , controls and the extra hardwood on the deck, I also used 1/2 plywood for the bottom as 3/8 marine plywood wasn't available .
     
  14. rocco611
    Joined: Jan 2019
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    Location: Madera Ca

    rocco611 Junior Member

    Aniline dye comes as a powder that you dissolve in water, alcohol, or petroleum solvents, depending on the formulation. I dissolved oil based brown dye in alcohol and wiped it on with a rag. then used a rag with just alcohol to blend it. I find it much more forgiving to use than commercial wood stains as it can almost be completely wiped off with alcohol and rag if you need to. I did end up with some blotches that show up in the pics but are hardly noticeable in the sun, in fact I didn't even notice the blotches until I looked at the pics.
     

  15. rocco611
    Joined: Jan 2019
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    Location: Madera Ca

    rocco611 Junior Member

    question about fuel tank and battery location. I have a Yamaha F25 short shaft on order. it weighs about 15 pounds more than the biggest outboard that is recommended for this boat. besides the motor , I will also need to install a fuel tank and a battery in the boat. where should I locate the fuel tank and battery? I was going to weld up an aluminum tank so I can make it any shape it needs to be. I was thinking of mounting the tank in the bow or making a wide thin tank and mounting it upright behind the front seat. 6 to 10 gallons would be plenty of fuel I would think, The F25 uses about 2 gallons per hour. I was reading about CG and Center of Bouncy but I am not sure where that sweet spot would be for this boat.
     
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