[PSUBS-MAILIST] Pressure proof motor

[hank pronk via Personal_Submersibles]

 Jon,I have a trouble free air compensation system, proven to 400 feet and many dives.Hank
    On Thursday, November 23, 2023 at 05:44:39 AM MST, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  Kittredge used this method for his K series using regular electric motors and mechanical seals.  No heat transfer was used even with the 70 amp 3hp motor he put in the stern.  Having seen Kittredge's design up close and personal, I don't think any available trolling motor would have a shaft long enough to build a 1-ATM housing around it utilizing mechanical seals.  If there were not some other compact way of sealing the existing shaft, an extension would have to be welded on and machined.  Then of course you'd have to fabricated a 1-ATM housing for each motor.  For me personally, the fabrication effort involved pushes me to the compensation model.  While there are some nuisance issues with compensation we should collectively come up with a "standard" for both air and oil that "just works" with reasonable maintenance.
Jon


    On Thursday, November 23, 2023 at 06:57:57 AM EST, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Im just thinking out loud here all, so this could be a stupid idea.
Has anyone made or modified a normal trolling motor to be inside a pressure can?
I was just thinking about the possibility of doing so?  Put a normal Minn Kota or similar inside a can with some sort of heat transfer layer in between the motor casing and the inside of the can.  Then pass the shaft through a high pressure shaft seal?  Something like this.
https://ahpseals.com/product/vs-rs19a-2/

Would eliminate a lot of the pressure compensating issues, but then i suppose have its own complexities.
Any thoughts?
Regards
James
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