Monday, February 6, 2017

Engine Hatch Frame Feb 2017

 So my plan is to put this marine Oldsmobile 350 with Berkly Jet pump into my Triloboat. I don't need a 250Hp motor, but it was a fraction of the price of a 25Hp outboard and draws less water. Besides, if I ever want to pull a log off of a beach like Relic in the old Beach Combers series, this is just the motor I need.
So here is the hatch frame, the large opening is just larger than the engine itself, and the smaller hatch behind is over the pump, which needs to be accessible to push the weed grate (Black handle) or to open the port into the pump itself to remove debris (rope is infamous to be sucked up by a jet pump in my reading)
There is a space aft of that hatch, which will end up under the bench seat. This is where I will put my little generator, a Yamaha 2400 with an aftermarket propane kit (it will run on gasoline or propane now)
Another view of the same stuff, just a different angle. You can also see the opening for my door/stairs out the starboard aft quarter (38" from the stern to be more exact)
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9 comments:

  1. Dave ZFebruary 7, 2017 at 1:09 AM

    Wow. That's a lot of pony!

    Will you be able to direct the jet for steering?

    Might consider some dredging outfit if you pass through gold country... could pay your way with a pump like that!

    Dave Z

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  2. Alan JonesFebruary 7, 2017 at 11:14 AM

    I was thinking Dennis, that if you put wide trim tabs made from aluminum plate, and hinged them from where the bottom curves up, you could get the boat to plane!

    It's looking good!

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    Replies
    1. Dave ZFebruary 7, 2017 at 2:34 PM

      I've been wondering about just that (in smaller boats), and suggested them in the T AiT design (Around in Ten). But I'm out of my league with motors/planing hulls...

      Would the side gaps need to be filled in to work? Or would simple plates provide the lift with little drag?

      Dave Z

      Delete
  3. Dennis DFebruary 7, 2017 at 4:25 PM

    I admit that my assumption was that a 10,000lb boat would require a lot more horsepower to get up on plane. I figured that high idle would probably get to hull speed, and the only other time it would be above minimum throttle would be short pulses to get going, quick course changes or stopping in a hurry. Oh, and pulling logs off of beaches. I have only planned on a 19 gallon fuel tank, so even if I got up on plane, I would be shortly out of gas anyways!

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  4. Dennis DFebruary 7, 2017 at 5:16 PM

    Also, I am intending to have the jet linked to twin rudders, so that they all steer together. I am working on the geometry of the rudders so that they are not in the path of the water jet while turning

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    Replies
    1. Alan JonesFebruary 7, 2017 at 8:19 PM

      Will the rudders kick up so you have very shallow water ability?

      Delete
    2. Dennis DFebruary 7, 2017 at 8:41 PM

      Yes, I am basing them on Dave's kick up design

      Delete
  5. DavidFebruary 9, 2017 at 9:25 AM

    Dennis,

    Your carpentry looks very nice. Even better than "good enough."

    The engine looks cool. Puts me in mind of this:

    https://www.youtube.com/watch?v=9DnUzX7qV5Q




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  6. Dennis DFebruary 9, 2017 at 8:18 PM

    Thanks for the compliments! Steam engines fascinate me, and I would love to play with one, however the Oldsmobile 350 was chosen for convenience. If I added in the time and machinery and learning curve to build a steam engine and boiler, I suspect that I would never get on the water.

    ReplyDelete

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