[PSUBS-MAILIST] automatic spool

Tue Oct 11 21:24:04 EDT 2016

Sean,There may be an even simpler way to implement a hydraulic pump\motor.  Picture a pump with a spool on it and the pressure line goes to a truck air bag half full of  oil.  Then picture the return line going to another truck airbag  1\4 full of oil.  Now when the assembly sinks the motor is forced to turn from buoyancy of the buoy , and in turn it pumps oil from the half full bag to the 1\4 full bag.  This increases the pressure in the 1\4 full bag as the pump continues pumping by displacing the air in the bag.  Now you reached your depth, and are starting to surface, the bag with higher pressure is going to act on the motor causing it to turn and spool in the line.  This would require a gear motor \pump and some serious calculating to determine  the correct displacement of the pump and volume of air bags.  It may be necessary to recharge the bags with air.  On further thought it may be better to use a piston pump because the oil could pass through the gears while your searching around for the lost gold boulder in Crawford bay.Hank 

    On Tuesday, October 11, 2016 5:43 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Just had a look at a video of a similar automatic reel.https://m.youtube.com/watch?v=qyqhgCkgqycYou would need to have the trigger disabled or removed so it just pulled on the linecontinuously. I can remember using 4lb or less leader line when I fished. It probably has about 1lb or less winding power judging by the way the guy was stripping out line.Be interesting to see how it works for you James. Alan
Sent from my iPad
On 12/10/2016, at 11:15 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

James,Your going to pretty well set up!Hank 

    On Tuesday, October 11, 2016 4:31 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hi HankSorry for delay, been offline for a few days.Havent thought of an air motor, might work.  Im not very familiar with them.  But I have bought this fishing reel thing that I think will be ok.  It takes about 40 meters of line and auto winds.  plus its small.  However, im not convinced it will stand up to sea water very well.  I think its 304 stainless.  Still, i'll give it a try. Check out this that I just bought (minus the outboard cover of course).....im super excited.  Hasnt been used for a while so needs a clean up of course, but its got loads of tooling and accessories with it. <IMG_0076.JPG>

On 8 October 2016 at 12:04, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi James,Been thinking about your automatic spool for towing a surface buoy, can't remember if you mentioned an air motor.    A simple air motor   with a constant air feed could work.  The motor and spool would have to be at the surface on or under the buoy.  I am not sure how tight an air motor is, but if the motor could hold back low air pressure, it could work.  The motor would be direct drive to the spool, in fact the air motor could be the spindle for the spool.  If a constant low air pressure is fed to the motor, the line  could be pulled out against that pressure.  The pressure it build up( acting as a pump)  would vent out the regulator.  The sub could pull the line down and when the sub surfaces, the air motor would wind in the line.  I doubt a vane motor would work unless the vanes are spring loaded.  A diaphragm based motor would be ideal.Hank 
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