[PSUBS-MAILIST] hand pump

Thu Apr 7 22:54:25 EDT 2016

Hank,5 liters would sink you at the same speed as 11lb of thrust from your motors.My motors were drawing 4 amps off 36V to achieve 11lb thrust, so maybeit's not worth the space, money & pumping effort!James Cameron had his sub go down head first to get to the bottom quickerbut I guess Elementary 3000 goes the same speed in any direction:)Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles <personal_submersibles at psubs.org> 
 Sent: Friday, April 8, 2016 2:31 PM
 Subject: Re: [PSUBS-MAILIST] hand pump

| I was thinking 5 litres max, it is a submarine not a formula one car. I could add a fake foil on top lol. Haha  |

     From:  Alan James via Personal_Submersibles <personal_submersibles at psubs.org>; 
  To:  Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
  Subject:  Re: [PSUBS-MAILIST] hand pump 
  Sent:  Fri, Apr 8, 2016 1:50:58 AM 

| Sounds a dangerous ploy Hank.If you had 50 liters of water to pump out, making you 50kg heavy (110 lb.)you might have trouble stopping.If you had two vertical thrusters with 50lb thrust each you would get the samespeed. At 1mph would take 34 minutes to get to your 3000ft max depth or 10 minutes at 3 mph.Maybe add another battery? It would be a lot of work hand pumping out the wateragainst 1500psi external water pressure at your max depth.Or maybe a drop weight full of rocks.Cheers Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, April 8, 2016 1:16 PM
 Subject: Re: [PSUBS-MAILIST] hand pump

Alan,I need full depth pressure rating so I can sink fast without thrusters then pump out some water at depth to go neutral.   I can't wast air like Gamma because I have no onboard compressor.   Hank 

    On Thursday, April 7, 2016 5:42 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,why not use an electric pump used on boats & have valves to operatevarious other functions. They are reasonably small, 12V & built for marine conditions.Can't recall what psi they go up to, but saw some rated 130 psi.Cheers Alan

      From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, April 8, 2016 11:18 AM
 Subject: Re: [PSUBS-MAILIST] hand pump

I use these at work sometimes:http://www.enerpac.com/en-us/industrial-tools/hydraulic-pumps-and-valves/hydraulic-manual-pumps-0Don't know what they cost though.Sean

On April 7, 2016 5:03:15 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi All,I am looking for a hand pump to remove water from my trim tank.  It will work like a DW.  I will empty the air out of the mbt and then flood a small plastic tank inside the sub.  Any ideas?Hank
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