I managed to assemby a fully funcional version of torpedo, it was a bit hard to balance as buoyancy but now it work perfectly.
If you want can use it as sub assembly in your torpedo bomber, but, please, be kind and leave me the little credit in description for the torpedo (and... ok, I'm curious to see your torpedo bombers! :D )
Plane in "speedboot mode" with torpedo launched
Torpedo in routing, plane in flight
someone else besides me has competed in building torpedoes working?