[PSUBS-MAILIST] Extending Operating Depth of MK101 without Pressure Compensation

[Jon Wallace via Personal_Submersibles]

At the 2024 PSUBS convention, Alec Smyth and Cliff Redus announced a modification for the Minn-Kota MK101 lower unit that significantly extends the operating depth of the motor WITHOUT pressure compensation.  For those who have been following the various issues that arise from both oil and air pressure compensation of motors, this is a huge technical step forward that completely obviates the need to pressure compensate for 99% of "psubber" class vessels.  Interestingly, the teams research has shown that submarines operating at 300 feet or less can almost assuredly use stock MK101's as 1-ATM units without any modifications at all.
Alec and Cliff have provided two documents for review, an overview of the project as presented at the 2024 convention and a detailed testing report.  You can find those documents here:
OVERVIEWhttp://www.psubs.org/community/projects/MK101/mk101modslides.pdf
TEST REPORThttp://www.psubs.org/community/projects/MK101/mk101modrpt.pdf

Jon
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