[PSUBS-MAILIST] Thruster Reliability

[Cliff Redus via Personal_Submersibles]

 Alec, I will be following your progress on this.  I sent you my drawing on brush end housing on the MF-101 that has been modified to accept the standoffs for my ducted nozzle.  I see this a possible long-term solution.  Short term is I am going to stay with oil compensation and switch to either Tellus 11, silicon oil or Univolt transformer oil.  I looked at my test chamber.  I can make a flanged spool that will give me the room to pressure test a Minn Kota 101 lower unit while in operation when you are ready.
Cliff

    On Tuesday, July 25, 2023 at 07:19:50 PM CDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Here's my inspiration. I've seen several original Kittredge subs still kicking with their original 1-atm, ceramic seal thrusters that are probably 40 years old. Their use is occasional, for sure, but they're maintenance has probably been zero. What I'd like to explore is doing what the Captain did, except with a Minnkota. If the bushings and brushes are dry and in 1 atmosphere, with the normal lubrication (a little grease on the bushings,) then I don't see why they can't have the same life as when they go fishing. 

On Tue, Jul 25, 2023 at 7:53 PM Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Thanks for the credit Alec, I think it was Brian Hughes ideafrom a previous discussion. Glad we are making some progress.As far as the oil / air debate is concerned, I believe Carsten said that you only need a few drops of sea water into an air compensated thruster to wreck it, whereas if there is oil in there the water doesn't do the same damage.Your compensator can be used as an air over oil system.You could even run 2 thrusters off the same compensator as a test. One with oil, one just air.Alan
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  On Wed, 26 Jul 2023 at 11:19 am, Alec Smyth via Personal_Submersibles<personal_submersibles at psubs.org> wrote:   _______________________________________________
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