[PSUBS-MAILIST] ROV opportunity

Sun Dec 20 01:33:21 EST 2015

Hi Pete,I have had a look at Doug's experiments with motors in the past.Some of them failed. & it may be a different story with bigger motors& higher voltage.I also have followed blue robotics since they started out as a Kick start venture. One problem I can see with the exposed motor is that with all the waterwith sand, grit etc in it, flowing over the windings, it will wear downthe windings thin coating.Cheers Alan

      From: Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, December 20, 2015 4:44 PM
 Subject: Re: [PSUBS-MAILIST] ROV opportunity

The Blue Robotics guys potted the terminals with epoxy and the thrusters are made with stainless/ plastic and aluminum.  Doug was testing in simulated sea water.(ocean in a bag)

Pete
--------------------------------------------
On Sat, 12/19/15, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] ROV opportunity
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Date: Saturday, December 19, 2015, 7:12 PM

 Pete,I ran a
 2000W motor in fresh water with a propeller but no
 housing.It worked
 well but was worse for wear afterward with a bit of
 rustshowing +
 the bearings seemed a bit rougher. From memory
 therewas
 rust on the magnets.Salt
 water is a lot better conductor than fresh, so you would get
 currentrunning
 from the + to the - terminal & bi-passing the wire
 windings.I think
 it would be more trouble than it was worth to waterproof
 &corrosion
 proof the motor. And then there is the sand in the
 bearings.Cheers
 Alan

 From: Pete
 Niedermayr via Personal_Submersibles
 <personal_submersibles at psubs.org>

 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 

 Sent: Sunday,
 December 20, 2015 1:38 PM
  Subject: Re:
 [PSUBS-MAILIST] ROV opportunity

 These thrusters are interesting in that they
 are made with stainless/ plastic and aluminum. they are open
 to the water and water actually runs thru them and cools
 them.  They claim that they can even handle some amount of
 sand particles in the water.  They are very small but
 perfect for ROV use.  

 Could this be done with thruster sized motors.I
 saw Doug Jackson doing the same thing with his ROV
 motors.

 Pete

 --------------------------------------------
 On Fri, 12/18/15, Douglas Suhr via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] ROV opportunity
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Date: Friday, December 18, 2015, 6:16 PM

  Sounds
  like
 a cool opportunity if you've got the willingness
  and time Brian. This past summer dad and I
 were on the hunt
  for a missing outboard
 motor on a Canadian lake. We had a
  camera
 but no ROV. We actually ended up cutting a 15 foot
  sapling to use as a camera pole. Depth was
 only 17 − 20
  feet so the sapling worked
 pretty well as a camera handle
  from the
 boat (and we found the motor), but a controllable
  ROV would have made things much easier.
  It looks like those guys make some
  nice parts for ROV projects. The technical
 (software) aspect
  scares me a bit, but
 that's only because I am
  electronically
 challenged. ~ Douglas S. 
  On Fri, Dec 18,
 2015 at
  11:30 AM, Brian Cox via
 Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:
  Hi

 All,                In my search
  for some Soda Sorb I stumbled on to a dive
 shop down in
  Hollywierd ,  the shop owner
 does a lot of business with
  the studios and
 wants me to build him a ROV camera

 platform which has certain capabilities that are not
  available at the present time.  I'm
 thinking about
  trying to come up with
 something for him.  I found these
  nifty
 thrusters made by these highly motivated kids. 
   Link:  https://www.bluerobotics.com/ These
  thrusters are interesting in that they are
 made with
  stainless/ plastic and aluminum.
 they are open to the water
  and water
 actually runs thru them and cools them.  They
  claim that they can even handle some amount of
 sand
  particles in the water.  They are
 very small but perfect
  for ROV use. 
  Brian
  Cox

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