ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

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PSG-1
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Location: South Carolina (redneck riviera)

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

Last month's storm tides carved a new inlet through the beach, which is now passable at mid tide with the jet boat. Having a little fun at being one of the first people to run this inlet, and just one more reason I love a jet boat!!!

[googlevideo] [/googlevideo]
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

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PSG-1
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Location: South Carolina (redneck riviera)

ALUMA-JET- Yet another upgrade!

Post by PSG-1 »

Since the thought of getting a rock in my pump has always made me nervous on those inland rivers, I decided it was time for a heavier duty grate with closer spacing on the bars. Not only that, but a stomp grate.
IMG_1389.jpg
I had a machinist make the pivot block, from stainless. The OEM model was aluminum, but because I was making a stomp grate, I needed to be able to weld tines directly to the pivot block, and I wanted to continue using stainless, like my old one, as aluminum tines aren't going to hold up against rock strikes.
IMG_1390.jpg
Bars are made of 1/4X 3/4" stainless, ground and contoured to shape to maximize flow-though. Spacing is 1/4" between all except the outside 2, which are 3/8" spacing. The 'step' on the back end of the bars is where they rest against the underside of the intake shoe. And yeah, it's heavy, LOL.

IMG_1391.jpg
IMG_1392.jpg
IMG_1393.jpg

Took it out on the maiden voyage the other day, I wasn't sure if that 1/4" spacing would starve the pump. it did not seem to affect it, even in some light chop. Also seemed to get less trash in my strainer, but then again, it wasn't a really low tide, either, so, I wasn't running over some of the shoals I usually run.

All in all I think it will work pretty good. The closer spacing of the bars makes me feel a LOT better.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

okavango
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Location: Maun Botswana

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by okavango »

That's a keeper, nice work.
How are the middle two movable bars attached to the shaft?
You have motivated me to get my boat back into the workshop.

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PSG-1
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

Thanks!

As for how the bars pivot, the shaft goes through the pivot block, and the 4 inside movable bars are attached to that. Because of the shape of the pump intake, I had to set back for the outer-most 2 bars, so, those are attached to the outer movable bars with a short length of rod, welded to both, so that they all move together as a set.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

okavango
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Joined: 08 Jul 2014, 02:17
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Location: Maun Botswana

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by okavango »

Was trying to work out how the two center bars attach to the shaft, is it a press fit or are the welded somehow?

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PSG-1
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Location: South Carolina (redneck riviera)

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

Yeah, that was a dilemma when I first started putting the whole thing together, how to tie the bars together.

On the backside of the pivot block, where those 2 pivoting center bars are located, I had to gouge out with my grinder, to give me enough room to access to the fit-up where the 1/4" stainless rod goes through the bars, so I could get in there and tack weld them with the TIG welder. That was a tight space, for sure, and I had to be real careful about how I did it, otherwise, I would have fused the bars to the pivot block.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

CedarRiverScooter
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by CedarRiverScooter »

PSG - You should patent that!

Reminds me of the gates at car rental lots.

Must be nice having open water - we are still frozen solid up in the nortwoods.

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PSG-1
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

I'm definitely looking forward to testing it out on some new stretches of river. We have already covered several hundred miles of inland rivers anyhow, but we'll be going to new places soon!


ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

CedarRiverScooter
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by CedarRiverScooter »

Great video PSG!

Just what I needed during this long winter.

You sure have guts going through such narrow passages on plane!

I am in the middle of re-setting my tunnel so that it is deeper, hopefully this will solve my cavitation problem permanently.

Will post pictures after the ugly part is done.

Can't wait for spring.

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PSG-1
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Location: South Carolina (redneck riviera)

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

CedarRiverScooter wrote:
You sure have guts going through such narrow passages on plane!
That's what I say every time I see videos of guys running jet johns in small rapids. I guess it's all about being familiar with the area, and knowing how to read the water.

Thanks for the compliments. I have fun doing videos of all the places we go to. Already planning out some new trips for this year.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

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PSG-1
Posts: 2248
Joined: 15 Sep 2011, 08:48
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Location: South Carolina (redneck riviera)

ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

A little additional reinforcement around the jet unit, to guard against any rock strikes, should I decide to venture above the fall line:
IMG_1472.jpg
These are 1/4" aluminum plates, that bolt to the existing box around the pump that is also made of 1/4"....basically extending the unit on the sides (something I should have done to begin with!)
IMG_1473.jpg
And then there's the ride plate on the bottom, made of 1/4" aluminum. I would have extended it farther, but the clearance to the reverse gate would have been really close, and it might have interfered with thrust power in reverse.
IMG_1474.jpg

Needless to say, I made it as bulletproof as I could. Turns out that was a good thing. Last week at the ramp, I pulled a good one, the ultimate idiot move, in fact.

Since the bottom of my boat is coated with Line-X, it no longer slides very well on the carpet bunks. So, I went over the top of the bunks with Trex boards, which are very slick.

Normally when I launch at the ramp by myself, I unhook the bow strap and safety chain, then hook my 25 ft rope to the bow eye, and secure it to the winch post of my trailer, and I toss the pile of rope on the bow, so it pays out. When I back down the ramp into the water, the boat will float off, and I pull forward, which pulls the boat up to the ramp, then I unhook the rope, set anchor, and go park the truck.

Even with the TRex boards, I have been doing it like this, without an issue. But for some reason, there was an issue, and I think you can guess what it was. #-o Yes, when I got about halfway down the ramp, the next thing I saw was the bow of my boat straight up in the air, with the a$$ end of my boat firmly planted on the ramp!! :shock: :shock:

I quickly hopped out, and winched the boat onto the trailer enough to lift the transom off the ramp, which, fortunately, is just hard-packed oyster shells, and not concrete. Then I backed it down in the water. Once I got into the boat and cranked up, I fully expected there to be no steering or reverse, but to my surprise, they worked. I ran around for a bit, but I noticed at speeds above 8,000 RPM, it wanted to porpoise.

After hauling out, I did a damage assessment, thinking it was going to be horrible. Once again, to my surprise, the only damage was the ride plate, the back end of it had gotten bent upward from hitting the ramp, but it most definitely served its intended purpose of protecting the steering nozzle. I think the side plates probably helped a little bit, too, being vertical, not horizontal, they were able to hold a lot of pressure.

In any case, I unbolted the bent ride plate, and used my press brake to straighten it out. Then, I decided to weld that piece of 1/4"X1" aluminum flat bar down the center, as a stiffener, in case anything ever hits that plate again. Hopefully it won't, but it's sure nice to know that added protection served its intended purpose! I would say it passed the torture test....with flying colors.

This, in conjunction with the improved stomp grate, as well as the Line-X, makes me feel a little more confident about venturing farther inland.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

CedarRiverScooter
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by CedarRiverScooter »

Thanks for sharing that story, last year I forgot to put the drain plugs in, the bilge got a good rinse needless to say.

Your mishap is a good reason to overbuild these rigs - ya never know what is going to happen!

I am interested in how that new skeg affect your handling. I would think it should help you stay straight.

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PSG-1
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 »

Yeah, like I said, I am SO glad I decided to go ahead and reinforce the area around the pump with all that plate. That probably saved me a busted steering nozzle, thrust nozzle, reverse gate, and the steering and reverse cables. The plates worked so well, that the boat itself never touched the ramp, there wasn't a mark anywhere on the bottom edge of the transom. That really surprised me.

Needless to say, if it can survive that, I think it will be OK if it bumps a rock in the river (at low speed, not wide open)

As for the keel on the bottom of the ride plate, not sure if that will improve steering, but I will know when I do some running around with it. I still don't think it will be enough to keep the stern from walking side to side when I am waterskiing behind it, that's just the nature of a jet boat. But I'm sure it will probably help it track straighter under normal operation.
ALUMA-JET project:
https://www.tinboats.net/forum/viewtopi ... 21&t=22023


Fishing, jet skiing, target shooting, jet-boating, and even a little oyster harvesting with Larry The Cable Guy.
Watch it all right here:

https://www.youtube.com/user/HKPSG1Shooter?feature=mhee

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mmf
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by mmf »

Hey man, havent visited site in a long time!
Just wanted to wave my hand and let you know I still would like to make a jet-jon out of my 2472 Sea Ark, bot I know it would take a large engine, though I dont care about going fast. Would appreciate all ideas and any advice you could give me.
I LOVE old aluminum boats and old Mercury outboards!

My 17' Tracker project: https://www.tinboats.net/forum/viewtopi ... 21&t=16860
Lone Star project: https://www.tinboats.net/forum/viewtopi ... 21&t=16581

CedarRiverScooter
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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by CedarRiverScooter »

2472 would be a cruise ship!

My advice is don't go cheap on the engine.

I did for 1st engine & then went back & replaced with 4 stroke yammie (PSG was role model on that).

4 stroke yammie is 3X better than the 2 stroke - less fuel, vibration, noise.

Take your time & search CL, rental places sell at the end of each season.

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