Thanks for the input everyone, but how about a proof that the 49 meter depth could launch torps???
And special thanks to Jten for the term and the examples...
Here are my conclusions:
A- 49 meters possible to launch in XVIII boat..
B- for the ones I tried, G7es need 400 meters gap in order to be armed..
C- Periscope view of target's keel achievable from 100 meters. Don't know how that affects G7a/ of G7e..
Will try the down the throat approach and upload the vid to Youtube


