ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

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

Post by PSG-1 » 30 Apr 2015, 09:55

Thanks for the info. That's about how it is here. 6 ft on the NOAA gages seems to be the magic number for most of our low country rivers. Much less than this, and some of them become impassible, due to shoaling. I've seen google earth images when these rivers were in drought, and there were entire sections of the river that were nothing but sand. But if the gages are reading well over 6 ft, all the nice sandy beaches and gravel bars are underwater.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 21&t=22023


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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by Capt1972 » 30 Apr 2015, 21:47

PSG-1 wrote:You can't see it in the last pic. It's hidden by the rubber skirting around the jet pump. The exhaust outlet is between the jet pump and the 'box' that it is bolted into. The tube near the steering nozzle is what would normally be the 'enema' on a PWC. Instead, I have it hooked to a quick connect fitting, with a coil hose and spray nozzle. This way, I can hose down the deck of my boat, as long as I'm underway, so there's enough pressure at the nozzle.
100_4251.jpg

In the other pics showing the engine, notice the large black hose that goes into the top of the jet tunnel, near the transom.
100_4247.jpg
This is where the exhaust enters the box. The rubber skirting around the jet pump contains nearly all of the sound coming from the exhaust, and because it's exiting near the jet unit, a lot of the sound is also muffled by the aerated water exiting the jet pump.
So the exhaust is "injected" after the impeller?

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

Post by PSG-1 » 30 Apr 2015, 23:46

Capt1972 wrote:
PSG-1 wrote:You can't see it in the last pic. It's hidden by the rubber skirting around the jet pump. The exhaust outlet is between the jet pump and the 'box' that it is bolted into. The tube near the steering nozzle is what would normally be the 'enema' on a PWC. Instead, I have it hooked to a quick connect fitting, with a coil hose and spray nozzle. This way, I can hose down the deck of my boat, as long as I'm underway, so there's enough pressure at the nozzle.
The attachment 100_4251.jpg is no longer available

In the other pics showing the engine, notice the large black hose that goes into the top of the jet tunnel, near the transom.
The attachment 100_4247.jpg is no longer available
This is where the exhaust enters the box. The rubber skirting around the jet pump contains nearly all of the sound coming from the exhaust, and because it's exiting near the jet unit, a lot of the sound is also muffled by the aerated water exiting the jet pump.
So the exhaust is "injected" after the impeller?
Hopefully this image will serve as a visual reference:

Screen Shot 2015-05-01 at 12.01.05 AM.png
Part #46 and #47...that's the baffle system for a Yamaha VX110, and this is basically what I copied from for my design.

The exhaust is contained within the space formed by the tunnel (basically a large box made from 1/4 aluminum plate) that the jet pump bolts up into. There's about 2 inches of clearance between the exhaust flange and the stator assembly of the pump. At no point does it actually go through the jet pump. The rubber skirting is notched to fit around the pump, and it's basically about where the exit nozzle bolts to the back end of the stator vane assembly.

So, basically what happens is that the exhaust passes through the flange on the top side of the box, and then the sound gets trapped inside of that, with the flexible rubber skirting allowing the sound to pass through along the edges of the pump, and along the bottom edge where the ride plate is. While it's not directly being injected into the aerated water from the exit nozzle, the sound is exiting close enough to this that the sound is diminished a good deal by the water exiting the pump, as opposed to having the exhaust routed like a typical PWC, where it's just a hole right out the back of the boat, that allows all the sound to escape with no baffling.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 » 07 May 2015, 10:46

Yet another overhaul of the Aluma-Jet.
Screen Shot 2015-05-05 at 6.13.42 PM.png

This time, I'm working on the hull. When I first painted the bottom with Rust-O-Leum roll-on truck bed liner, I had sandblasted the bottom with Starolite. But I failed to etch with ospho, nor did I apply some zinc chromate primer. As a result, there were spots in the paint that had begun to flake and chip. And other areas where I had worn the paint off, from sliding over sandbars. In the areas where the paint was flaking, I noticed 'sugar' starting to form. Not good.

So, after 10 years, I decided it's time to re-paint the bottom. But not just with any paint. I'm going with Line-X type XS-350, which is military grade, and much more durable than what they put in the truck beds.

However, because of the horrible condition of the existing paint, the guy at Line-X said the bottom needs to be cleaned off, and I fully agree.

At first I tried a wire wheel. Very slow going, and I couldn't imagine having to work upside down on the entire boat like this. Tried a flap wheel, and it loaded up, started smoking. No good. So then I decided to use aircraft coating remover. It works, but just barely. Mixing some laquer thinner with it does help break down the epoxy of the bedliner coating. 2300 PSI power washer, with a turbo nozzle does as well as I could do with a scraper, especially with my screwed up shoulders.

I'm about 99% done, but now we've got a storm system that's going to dump rain for the next 4 days, so, it's at a standstill.
Once I get the paint off, I will go back and etch with ospho, then power wash, and have it line-x'ed.

Will post more as it progresses.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 » 13 May 2015, 19:22

After 6 gallons of stripper and a week of blistering the old paint and power washing it, I've finally gotten down to bare metal.
IMG_0583.JPG
IMG_0584.JPG
IMG_0585.JPG
Tomorrow morning I'm taking the boat to have it coated with Line-X.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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Line-X....DONE!!!

Post by PSG-1 » 14 May 2015, 18:27

I didn't feel comfortable using the makeshift boat hoist that we made from 4x4's....at least not with someone else crawling under it. Also, it would be better to have the boat higher anyway, about chest-high, so they could see what they were doing, and not have to lay on their back.

One of my good friends has a boat lift that they use to hoist commercial fishing boats for doing hull work. I welded the I-beam on it when they built this lift a few years ago. He was nice enough to let me use the lift today, so, we got the boat up there, hoisted it off the trailer, and the Line-X guy came out to do the bottom.
IMG_0594.JPG

Since the wind was blowing like a SOB, not to mention lots of motorcycles being parked nearby due to it being bike week, we used plastic and made a makeshift paint booth, that worked out nicely. The line x atomizes and dries in 10 seconds anyway, but we wanted to err on the side of caution.
IMG_0586.JPG

Gettin' er done
IMG_0588.JPG
IMG_0590.JPG
Much better than the old stuff I had on there, which was flaking and peeling in many areas. The old paint was so ugly, I didn't have the heart to take a picture of it. But you can probably see it in some of the previous photos in this thread.
IMG_0592.JPG

Line X representative Jon Jackson and his employee George at work
IMG_0593.JPG
IMG_0595.JPG

Back on the trailer at home. Still gotta do some other work, such as 5200 all edges of the line-x, to give a smooth transition, and to use an adhesive that guarantees no edge can peel. Also have to change out my wear ring for an all-stainless model, since the corrosion has caused the liner to swell, and my impeller is hitting it. While I have the pump apart, I'm going to change to a new, re-pitched impeller, a Solas Concord 14/21.
Attachments
IMG_0597.JPG
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by gillhunter » 14 May 2015, 18:44

Looks great!!

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 » 14 May 2015, 19:25

Thanks! I have a lot more confidence in the longevity of the hull now with this coating. With the stuff I had on there, it was getting really bad. There was a lot of pitting from electrolysis. The boat has been running for 10 years. With the Line-X on there, I should get at least another 10 years out of the boat before I need to worry about anything.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA-JET....sprucing it up

Post by PSG-1 » 18 May 2015, 19:03

Since I got the bottom Line-X'ed I figured I might as well freshen up the rest of the paint job, starting with the black above the waterline.
So, I taped it all out, and got my HVLP gun set up, and shot it last night.
IMG_0604.JPG
IMG_0605.JPG
No clear coat. That's how it comes out when you spray it from an HVLP. This is Interlux Brightside paint, thinned with just a little bit of 216 thinner (xylene)

I wiped down the boat, sanded it with 220 grit on a DA, and anywhere there was bare metal, I shot it with some zinc chromate primer.

Now that it's painted, I ran a thin bead of black 3M 5200 all the way around the edge of the line-x, including underneath the boat where it meets the edges of the jet intake and the tunnel. This will prevent any edges from peeling, hopefully.

Now I just need to get the interior re-painted with Hatteras off-white, and it'll look like brand new.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by Skiffing » 18 May 2015, 20:12

Whoa!

That's sharp.

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by HeavyHook » 19 May 2015, 11:19

Looks great - love the paint job

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ALUMA-JET- Duracraft 1648 SV Jetboat Conversion

Post by PSG-1 » 19 May 2015, 23:38

Now working on the Interior paint:

Since it's mostly diamond plate, instead of using a DA sander with 220 grit, I used the pressure washer with turbo nozzle at close range to loosen any flaky paint. It exposed some bare metal, for sure.

On the smooth areas, I sanded with the DA, then wiped down the whole thing with Xylene.
IMG_0606.JPG
The yellow is zinc chromate primer, where I touched up all the bare metal before painting.
IMG_0607.JPG
IMG_0608.JPG
Once it dries, I'll pull the masking and get a better pic.
Last edited by PSG-1 on 20 May 2015, 15:15, edited 1 time in total.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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

Post by PSG-1 » 20 May 2015, 13:27

Got it rolled out into the sun this morning, and pulled all the masking. Of course, about 3 hours later, it started sprinkling rain. #-o Fortunately, the paint was fully dry.
IMG_0609.JPG
IMG_0610.JPG

Since these High Output decals are about 80 dollars a piece, I figured it would be worth the time and effort to tape them out. I did pretty good on the masking work.
IMG_0611.JPG
IMG_0612.JPG

Hard to believe this is an 18 year old boat. Even harder to believe it started out as a 50 dollar boat destined for the scrap yard.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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ALUMA JET- EXHAUST BAFFLE SYSTEM PICS

Post by PSG-1 » 22 May 2015, 02:02

Capt1972 wrote: So the exhaust is "injected" after the impeller?

Since I had the pump apart today, I figured I would post some pics, for good visual reference.

Here we go:
IMG_0613.JPG
Top left corner is where the exhaust exits from the muffler, into the tunnel

IMG_0615.JPG
Tunnel has a framework made of aluminum angle along inside, with mounting holes for the rubber skirting.


Rubber skirting is trimmed to fit around exit nozzle, including notches for reverse cable (top), suction bilge (left), wash down line and steering cable (right)
IMG_0614.JPG


The rubber skirting fits around the nozzle like this:
IMG_0616.JPG
And then the ride plate is underneath, so the entire setup creates a sound baffle system of sorts. Works pretty good. Along with a rear platform, to help tone it down even more.
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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

Post by PSG-1 » 19 Jul 2015, 10:15

Despite it being almost 100 degrees, I ran a little bit on the PeeDee River yesterday between Society Hill and Cheraw, SC.

Water level is EXTREMELY low:
Screen Shot 2015-07-17 at 9.25.16 PM.png

We were going to go up to the fall line at Cheraw, but about halfway up, there was a shoal extending across the river. Even though it was probably deep enough, we could see some bad weather building in the distance, so rather than risk being grounded in a storm, we went back down to a gravel bar just below the shoal and stopped to take a break and gather a few rocks:
IMG_0777.JPG

Check out this idea for a river house, built on the old pilings of a bridge pier:
IMG_0776.JPG

I'm glad we decided not to go further upstream toward Cheraw. By the time we got back to the boat ramp at Society Hill, I could see dark clouds, with lightning. Time to go home!
IMG_0780.JPG
ALUMA-JET project:
http://www.tinboats.net/forum/viewtopic ... 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:

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

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