SUBSIM Radio Room Forums - View Single Post - Tips for Type-XXI

Marcello · 01-19-13, 02:50 PM

Some additional thoughts.
In transit I mostly travel underwater at a speed of 3 knots, sometimes increased to 4-5 at night between the two snorkel charges. I guess that if you are more comfortable than me with a greater battery drain and longer recharge time cruising at 4-5 all the time could be an option. To compensate somewhat for this slow speed I sometimes run on the surface in bad weather, diving periodically to perform sound checks. Occasionally with fog but calm sea I have kept using the snorkel even after having topped the battery but this is a less frequent condition.
In patrol I stay almost always underwater running at 1-2 knots, except for attacks and putting some distance from my last sinking for which I increase speed as necessary.
Some additional suggestions from real life can also be found here:

http://www.uboatarchive.net/BDUOrder1.htm

01-19-13, 02:50 PM	#10
Marcello Planesman Join Date: Nov 2012 Posts: 183 Downloads: 49 Uploads: 0	Some additional thoughts. In transit I mostly travel underwater at a speed of 3 knots, sometimes increased to 4-5 at night between the two snorkel charges. I guess that if you are more comfortable than me with a greater battery drain and longer recharge time cruising at 4-5 all the time could be an option. To compensate somewhat for this slow speed I sometimes run on the surface in bad weather, diving periodically to perform sound checks. Occasionally with fog but calm sea I have kept using the snorkel even after having topped the battery but this is a less frequent condition. In patrol I stay almost always underwater running at 1-2 knots, except for attacks and putting some distance from my last sinking for which I increase speed as necessary. Some additional suggestions from real life can also be found here: http://www.uboatarchive.net/BDUOrder1.htm Last edited by Marcello; 01-20-13 at 05:43 AM.