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Thread: Very cool jetboat build project

  1. #1
    Member OzAK's Avatar
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    Default Very cool jetboat build project

    DSCN1356.jpgDSCN1348.jpg Okay guys, I know you are chomping for soft water. It's been a long winter and I figured everyone could use a diversion from the ordinary. Headed over to my friend Freds place today to get some pictures of this thing. It's been a work in progress for the last two winters (and summers too) but he says the hard parts are finished and it should get wet sometime this summer. I have a lot more pictures than there is space but I can keep posting as questions arise or just for fun. I've been invited to drive it after the open water trials are finished and have gone for a ride in it. How cool is that?
    Fred is a true craftsman with a keen eye for detail and is a builder of many fine things. He has about 30+ boat builds to his credit, most if not all of which have been wood and about half of those have been go fasts like hydroplanes. I believe this is his first aluminum boat and its looking good. Fred also builds a mean guitar, any style or type you may want. He makes his real $$ doing aerospace work repairing sheetmetal structures which is where I met him some 30 years ago.
    Why a riveted boat you may ask? A couple of reasons, first of which is he doesn't weld. On the other hand he is amaster with aircraft structures and can scratch build like crazy. He just draws up a single page "set" of plans and elevations and commences building out of his head with the rest of it. Talented for sure! Reason #2 is weight. He wanted light and light equals thin, a bit thinner than most welded boats are. All rivets/fasteners are installed with 3M 5200 shot in wet with all seams, strakes, chines, and skin laps put together with 5200 as well. This boat will not leak nor will it be willing to come apart or work rivets loose very readily.
    As you look at this artform keep in mind that anything you see is all scratch built, mostly out of his head except the powertrain. Certain parts in the drive are either built by Fred or highly modified to be better than stock. See the details below. Enjoy!!!

    The details: The Hull
    15.9' with an 18" afterplane. 95% of hull structure is 5086 aluminum with the exception of certain parts of the heavy structure of the transom. The keel area from ahead of the intake to the back of the afterplane is, like the rest of the structure, skinned with aluminum. Over that aluminum is a form fit cover of stainless steel, about .040 in thickness, should help with the rocks if (when) he encounters such things. Hull has a 10 degree deadrise outboard of the ride plate/afterplane. There are 3 floatation compartments and 2 fuel tanks for a fuel capacity of about 20-22 gallons.

    The Powerplant
    B18C Honda from a Honda Acura LS. This engine is 200 HP stock. What you see in the picture weighs 304#. It is missing only the starter and the exhaust system and the coolant. This sweet little engine won't weigh in at over 350# when it's ready to go. The exhaust is a Burns custom stainless header that will be scratch built as this thing comes together in the engine compartment. The dual tapered megaphone is the heart of that pipe and is a work of welding art. The header pipe lengths are or will be, as you would expect, equal in length. The telltale port aft of the jetpump will be used not for the silly and idiotic looking roostertail that some PWC have but for cooling the header and dampening the noise. This Burns exhaust is a bolt-on and is dyno tested as adding (extracting actually) 30-40 HP to the stock numbers. There is also the added bonus of an additional bolt-on unit, the Edelbrock Performer X Intake with larger injectors. It also adds an additional 30-40 HP to the numbers, so now we're pushing 260-280 HP out of 350# or less. This is reliable horsepower as there have been no mods other than letting the engine BREATHE.

    The Pump
    A 2002 Yamaha Waverunner XL 155mm Pump with a very trick and custom intake scratch made by Fred. The actual pump and stator is a Skattrak Magnum XL with a modified stator.
    Finally, the finished weight. It's estimated to be about 600# dry, so add say 200 for the guy and another 120 or so for fuel. Rounded off , thats 950 pounds pushed by say 260 HP. Any estimates on how fast this scalded cat will be??

    That's most of the specs I have for now, I'll keep snapping pics as needed. Hope you find this entertaining. As a gearhead and wrench I love this stuff. R&D is a hoot. I'll post more soon. This boat is also powered by adrenaline.

    Have fun guys, Oz

  2. #2
    Member Akgramps's Avatar
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    Very cool indeed Oz, thanks for posting....Fred is definitely a talented fabricator............!
    I will appreciate more photos as the work proceeds............!
    “Nothing worth doing is easy”
    TR

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    Member skybust's Avatar
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    You are right that is one cool looking rig I dont know anything about engines but that thing is going to fly keep the pics coming he should run in the race thay have to the Yukon I think it is

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    Member tjm's Avatar
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    cool is right....

    it's been 6 hours now...how 'bout some more pics
    ------------------------------------------------
    pull my finger....

  5. #5
    Member OzAK's Avatar
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    Default More pics

    DSCN1360.jpgIt was late when I posted or I would have given you more, this engine has possibilities. Power to weight is good. Some help here too please. Is there any way to post more than two pictures or am I stuck with this? DSCN1357.jpg

  6. #6
    Member OzAK's Avatar
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    DSCN1351.jpgAnd moreDSCN1355.jpgHere's the business end from both sides of the transom. The drive coupling is standard Yamaha Waverunner stuff, the view up the tailpipe shows the Skattrak Magnum guts.

  7. #7
    Member spoiled one's Avatar
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    I guess this answers the question "What do you do during those cold, dark winter nights up there?" Very cool build. The rivets add to the look in my opinion. Fred is a talented craftsman.

    As far as your question about posting pictures, open a photobucket account and post the IMG tag. Your photos will show up full size in your post like this:


    Here is a how to link:
    http://forums.outdoorsdirectory.com/...sting-Pictures
    Spending my kids' inheritance with them, one adventure at a time.

  8. #8
    Member OzAK's Avatar
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    DSCN1350.jpgDSCN1367.jpgOK, note the intake "casting" that's bolted to the transom that supports the liner/stator/outlet nozzle. Next pic will show it in better detail and I'll explain more. The view inside the intake is the inside of that "casting" as well. Note the gap where the driveshaft enters the intake. Next pics will show the finishing touch to this area that jets just dont have.

  9. #9
    Member OzAK's Avatar
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    Now, Photobucket is uploaded. Forgot I had an account. My albums there are public, there are some good pics on my SportJon build from 08 that may interest you Phantom nuts. If I get this wrong, you'll get nothing and prove how computer dense I really am.There are probably cleaner ways of doing this.



    ,

  10. #10
    Member HCL's Avatar
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    OzAK;
    Sent you a PM, Phantom related.
    Mike

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    Member f0zzy2's Avatar
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    Fred is an awsome craftsman. I gotta say one of those pics looks like the inside of a DC6 wing. Is that over in the crew quarters Mike? I would like to go check it out and talk with Fred about that honda.

  12. #12
    Member broncoformudv's Avatar
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    This is one interesting build! Fred is doing a great job and that tub looks FAST just sitting there!!

  13. #13
    Member OzAK's Avatar
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    Default Adding a couple more

    DSCN1349.jpgDSCN1368.jpgThe pointy end had to be finished with something to close it up and this is what Fred came up with. The driveshaft fairing I spoke of that fairs in the shaft-to-intake clearance. It will be riveted in place when the time comes.

  14. #14
    Member OzAK's Avatar
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    Default That's all I have

    DSCN1366.jpgDSCN1364.jpgFor those that are unfamiliar with hot boats, the pic on the left is the ride plate. I'm not really really conversant with this type of hull construction either, a lot I've picked up from Fred. Anyway, the ride plate is pretty much all the boat is running on when on plane at speed. The less wetted area, the faster you go within the laws of physics, hydrodynamics, and horsepower. Needless to say, this one will be, for lack of a better description, liquid quick. Far faster than any of us on this forum will ever go in the sleds we spend time in. Pic on right just a good view of keel, strakes, chines and just general construction. This is all I've got for now, will update as major things happen. Yep, pretty cool.

  15. #15
    Member tjm's Avatar
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    love the first pic of the intake/planing surface....
    ------------------------------------------------
    pull my finger....

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    That is gonna be a missile. Please video that when you guys launch. Thanks for sharing.

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    Member KelvinG's Avatar
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    The man is an artist! Thanks for sharing.

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    I have thought about using the same Honda powerplant for a boat. I am very excited about your project. How very cool. I used to be into Honda cars but that was 10 years ago and thought about the powerplant for boat use back then. So is your engine a VTEC model or non VTEC?

    Can't wait till spring to see how your boat performs.

    Sobie2

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    Member AKDoug's Avatar
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    Is that enough pump for that much H.P.? 155mm is something like 6". Seems like it could move more water than that?
    Bunny Boots and Bearcats: Utility Sled Mayhem

  20. #20
    Member OzAK's Avatar
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    Quote Originally Posted by Sobie2 View Post
    I have thought about using the same Honda powerplant for a boat. I am very excited about your project. How very cool. I used to be into Honda cars but that was 10 years ago and thought about the powerplant for boat use back then. So is your engine a VTEC model or non VTEC?

    Can't wait till spring to see how your boat performs.

    Sobie2
    Sobie, see attached, it's a V-TEC. Tell me more if you care to share about the differences and other tidbits.

    AKDoug, Yes, plenty of pump, it's rated for up to 300 HP. I'm guessing now, but am thinking that's with the SkatTrak mods to the pump. This project may not be water ready by spring but Fred says this summer or at least this season. DSCN1362.jpg

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