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Old 11-07-2022, 12:52 PM   #41
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One dive company that cleans boat bottoms in our marina use a gas powered pressure washier for props, rudders and shafts. It’s a better and quicker job than doing it manually. It is a little unsettling when your inside and hear the underwater noise though. They still scrape the bottoms.
Same here. My divers use a very large (think industrial size) 4300 psi washer with a short (2’) gun and a wobbler jet nozzle. Great for tight areas, running gear & thruster tunnels apparently. These pro salvage divers tell me they have to fin hard to stay in place, not for the faint of heart. They also try to minimize its use ‘cus it’s very hard on the paint, for which I thank them & tip accordingly.
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Old 11-07-2022, 01:04 PM   #42
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What about the cloud?

It you did a water blaster in California - huge fine!!!

No water clouding!! So no to a ablative bottom for sure!
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Old 11-07-2022, 01:07 PM   #43
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There is a system we use commercially, uses cavitation to clean, it will remove loose paint. www.caviblaster.com
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Old 11-07-2022, 02:26 PM   #44
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Greetings,
Mr. L. I would certainly try a pressure washer and I'm sure you can get a cheap wand that can be adapted to a short profile. The ONE concern I would have is reverse thrust. Exit of water under pressure will want to push you in the opposite direction unless you can anchor yourself, somehow (stand on the seabed?, grab rope?, waterproof skyhook?).
I had the exact same thought... Great minds?!
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Old 11-07-2022, 08:31 PM   #45
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There is a system we use commercially, uses cavitation to clean, it will remove loose paint. www.caviblaster.com


Wow, pretty cool tool. Starts at 3K.
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Old 11-07-2022, 10:07 PM   #46
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I do my hull cleaning with a hookah setup. It is not bad, but I get tired fast.
Something to bear in mind is that when you exhale, not all your breath escapes into the atmosphere - some is left in the pipe. When you next breathe in, you will inhale some of your previous breath which will have an increased level of CO2 in it. This increases, breath by breath. Not surprised you feel tired, quickly.
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Old 11-07-2022, 10:10 PM   #47
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Something to bear in mind is that when you exhale, not all your breath escapes into the atmosphere - some is left in the pipe. When you next breathe in, you will inhale some of your previous breath which will have an increased level of CO2 in it. This increases, breath by breath. Not surprised you feel tired, quickly.


I thought it was my age.
What is the solution?
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Old 11-07-2022, 10:15 PM   #48
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I thought it was my age.
What is the solution?
Don't breathe (!), or ensure the system is able to remove all your exhaled air.
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Old 11-07-2022, 10:16 PM   #49
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Originally Posted by greatpapabear View Post
Something to bear in mind is that when you exhale, not all your breath escapes into the atmosphere - some is left in the pipe. When you next breathe in, you will inhale some of your previous breath which will have an increased level of CO2 in it. This increases, breath by breath. Not surprised you feel tired, quickly.

I believe your thinking about a snorkel, a hooka uses a dive regulator and the exhaust is not re breathed.
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Old 11-07-2022, 11:14 PM   #50
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I believe your thinking about a snorkel, a hooka uses a dive regulator and the exhaust is not re breathed.
Hollywood


Correct. I have an air compressor with air filter and 100’ hose with a second stage regulator at the end. I don’t there is any re-breathing going on.
It must be my age.
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Old 11-07-2022, 11:50 PM   #51
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yup, getting tired faster as we age. next you will start having afternoon naps.
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Old 11-08-2022, 12:15 AM   #52
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yup, getting tired faster as we age. next you will start having afternoon naps.
I already have those…. Don’t tell me that I am getting old.
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Old 11-08-2022, 02:57 AM   #53
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Something I saw in California many years ago was a heavy plastic liner in slips for racing sailboats. A board at the end of the slip, stretching between walkways, holds the back of the liner up when docked and is weighted to sink and allow the boat to leave. Once docked the board is pulled up and the water around the boat is isolated from all other water. A half gallon of bleach is added around the boat and nothing grows. Probably illegal now.
If my private dock was in salt water, I'd do it here.
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Old 11-08-2022, 04:06 AM   #54
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underwater hydro blast cleaning

A few years ago, I was involved with an underwater blast cleaning operation.
They were removing a concrete coating from an undersea pipeline. Depth 60ft.
The jetting guns were very specialised so as to neutralise the jet reaction. Basically had an equal and opposite discharge tube. The back tube was about 3.5 feet long so that the diver could not injure himself. Indeed a tube broke off, and the diver removed his bicep.
As previously noted, not so much a problem if one can anchor your body securely. I think the jet reaction would be significant even with moderate operating pressures.
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Old 11-08-2022, 08:02 AM   #55
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Have you thought about using an ultrasonic anti-fouling system like sonihuall or hullshield? Install once and never have to drive and scrape again.... will likely pay for itself in one season. The USCG uses the technology on most of their smaller vessels.
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Old 11-08-2022, 08:04 AM   #56
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I'll second RT's comment. If you're having trouble staying near the hull now, think of the thrust of a pressure washer pushing you away much more than hand pressure. You'd need a plan (something to hang on to?) to counteract that thrust.



Ken
That was my first thought. You'd be like Rocket J Squirrel down there.
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Old 11-08-2022, 08:29 AM   #57
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Have you thought about using an ultrasonic anti-fouling system like sonihuall or hullshield? Install once and never have to drive and scrape again.... will likely pay for itself in one season. The USCG uses the technology on most of their smaller vessels.
I keep waiting for one of these systems to use a catamaran to demonstrate effectiveness of their product. One hull with, one without. Until then, I will put their marketing material in the same file as Algae-X magnetic fuel cleaners.

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Old 11-08-2022, 09:08 AM   #58
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I keep waiting for one of these systems to use a catamaran to demonstrate effectiveness of their product. One hull with, one without. Until then, I will put their marketing material in the same file as Algae-X magnetic fuel cleaners.

Peter
Peter,


Here you go: https://youtu.be/MRDVtVMKp3c


Kevin
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Old 11-08-2022, 09:14 AM   #59
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yup, getting tired faster as we age. next you will start having afternoon naps.


Yep. I am already there….lol
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Old 11-08-2022, 09:20 AM   #60
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Have you thought about using an ultrasonic anti-fouling system like sonihuall or hullshield? Install once and never have to drive and scrape again.... will likely pay for itself in one season. The USCG uses the technology on most of their smaller vessels.


My hull is steel. I’ll look it up, if steel surface is a problem?
I know one boat here in the marina who has it and it works for him. He has a fiberglass boat.
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