gapullingapullin Posts: 23 Baller
Interested in converting our Accufloat course to a sinking version. Planning to construct a "homemade" version of an Accusink, but if anyone has a used Accusink or Wally Skier available at a reasonable price, I'd appreciate a reply. Also, if anyone has pearls regarding construction of a sinking unit from scratch, feel free to provide input.
The course is in variable water depth from 25-100 feet. Plan is to use 5 gallon sealed pails for air bladders with slightly positive buoyancy when saturated, and lead weights dangling about 10-15 feet above bottom attached to the pails. When the course is sunk, this will keep it at an even depth. When the pails are air filled, the combination of buoyant pail and negatively buoyant lead weight creates slight negative buoyancy, just enough to hold the assembly down.
1/4" high pressure air hose will supply the needed compressed air, provided by a refillable portable compressed air tank.
Thanks in advance for input.


  • BraceMakerBraceMaker Posts: 3,385 Mega Baller
    If doing 5 gallon buckets buy inner tubes put them into the buckets and perforated the bucket so it fills with water. The inner tubes will then expand in the confines space and displace water. What wallysinker figured out is that rigid pressure chambers cause problems as water can accumulate in one chamber or several chambers and cause failure to float.

    The genius of Wally is using a vacuum pump enough water is able to be extracted that it will float.
  • hockeyref74hockeyref74 Posts: 20 Baller
    using that much lead if on public lake could be trouble with DEP
  • BraceMakerBraceMaker Posts: 3,385 Mega Baller
    Not that it matters - but I think he's in New Zealand, they might not be so zealous about lead weight. Its probably not all that hazardous to use in this capacity.

    Think about growing up, how many of you guys used your teeth to bite lead sinkers onto the fishing line?

    Solid lead poured around a stainless eyebolt won't go anywhere and is about the most weight/size/cost that you could get.

    Dip the whole thing in plasti-dip or epoxy flooring paint.
  • coach3coach3 Posts: 57 Baller
    don't over weight the course, you barely need enough weight to slowly sink it or otherwise in deep water you have to dial the pressure up too much and you blow fittings. I have an accu sink with wally skier. been skiing it for the past 20 years.
  • 75Tique75Tique Posts: 47 Baller
    I'm not throwing this out there because I know its a problem, but because I recall some sort of problem with a friend's accu-sink course related to variable depth to bottom of lake and the different pressures required at each end and the fact that beyond 30 feet deep you are at an additional atmosphere and the deep end didnt fill at rates needed to fill the shallow end, or something like that. 100 feet is 4 atmospheres. That's quite a bit. Anyone have any idea what I am talking about?

    Also my own question. Never thought about a "homemade" accusink. Do all 22 balls need to be bladdered and weighted or just some or most and the others will follow along?
    “So, how was your weekend?”
    “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.”
  • gapullingapullin Posts: 23 Baller
    Thanks for the comments. I'm in British Columbia. No issue with lead up here. As far as variable depth goes, not an issue, only the lead "sub weights" sink to the bottom. The buckets/bladders sit about 15 feet (1/2 atmosphere) below the surface. Love the idea of air bladders, of course this will likely require a vacuum pump to extract air, otherwise I think they might drain quite slowly. My original plan was to use the pails themselves as air reservoirs. That plan involved about 20kg of concrete poured in the bottom of the pail with a hollow tube entering the bottom of the pail and travelling through the concrete. Opening a valve at the inflate end of the high pressure hose allows air, which of course is lighter than water, to drain out, permitting water to enter the pail through the tube. Once all air is displaced, the bucket will sink, with the assistance of the lead weight dangling 15 feet above the lake bottom. Once the weights hit bottom, the course remains suspended 15 ft below the surface.
    Using compressed air through a Shraeder valve on the surface will displace the accumulated water out the bottom of the bucket through the tube and allow the guide/turn balls to float the pails and lead weights.
    I think the advantage of inflatable tunes is that they will create a more reliably sealed system that is less prone to leak over time.
    Does all this sound reasonable?
  • gapullingapullin Posts: 23 Baller
    One more thing: I plan to use 22 sinkers, one for each floating ball. That way no asymmetrical forces are generated. Pregates will be independent.
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