Just bumping this thread as I'm sure someone must know what an explosive coupling is ! Thanks all .
Thanks you guys above . I guess I'm going to wander for ever in the realms of uncertainty about what an explosive coupling is . Shame really but that's the way of the world .
If they are AM and RN part-numbered they could be something to do with Glider tow ropes, which were also used to tow midget submarines across the North Sea to sink the Tirpitz.
Hangarman
Dave . Yes , it unscrews & has a spring & striker inside . I think the clue to this must be the AM code number . Someone must have a list of Air Ministry codes in their possession ! I just had a thought [unusual , I know] , what about a glider tug release ?