Yes had thought of spring launching, not so much fun though 😁
Also considered compressed air, like some originals, I still have a box of Sparklets bulbs on the shelf in the workshop. The thyphon thoda has long since disappeared though - as has the whisky
Decided to reserve those for the two quad torpedo mounts though 😊
10mm alu launch tubes are prepared. The actual mountings and trigger mechanism are a bit trickier though! Got some 8mm O/D alu tube as raw material for the torps.
Also have a set of 3V micro motors which just fit inside the 8mm tube.
BTW: on a recent extended foray into the nether regions of the cellar I found my Knatterboot (Pop pop boat) 😀 While looking for something completely different of course🙄, which I didn't find 🤔
Cheers, Doug 😎