| Ian
The 2 holes on the top are just to help release any air that has got trapped inside the conning tower. The upper front and upper rear holes are for adjustment as you say and the bottom rear is for the spring retaining nut that is attached to the bottom of the periscope.
I have always used the periscope mechanism and haven't tried disconnecting it to sail. I had understood that the down angle on the front planes was what caused it to dive. If this was not automatically revered to surface - would it still surface? I am not sure what the effect would be using the rear planes only. You might need a pair of waders if it doesn't work!
Andrew |