"At deck level the line runs to a bobbin (or drum)."
Your solution certainly looks good in the photos but the one factor that's been bugging me since my first tentative 'thunks' on the subject has been friction! How to ensure that the whole shebang is a friction free as possible and that it actually releases in case of a 'disastrickle'!😮😭 Have you tested your setup for free running?
Your solution appears to have three potential friction points-
The loops that both tether and spike pass through,
The 90° turn through the ring at the mast foot,
The cable drum; bearings, potential line tangling.
Do you know if your bubbly cork has enough buoyancy to overcome all this?
For my sub, type 1A U25, I was thinking in terms of using the aft torpedo loading hatch with the float and the flat-coiled tether in a compartment within the flooded hull section.
Flip the hatch and away she goes. It's the flipping that's the tricky bit🙄
The float could be a Minion body😁 e.g. a yellow Surprise Egg case.
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