please expand upon this as this is interesting , many thanks and thanks for sharing .some other details for you to ponder

U-511 Type IXC
Feldpost Number M 42 792

Construction Yard Deutsche Werft AG, Hamburg-Finkenwärder
Yard Number 307
Ordered 20th Oct 1939
Keel laid 21st Feb 1941
Launched 22nd Sep 1941
Commissioned 8th Dec 1941
Baubelehrung Baubelehrung U-Boote Nordsee, Bremen /
Kriegsschiffbaulehrabteilung für Unterseeboote Nordsee, Bremen /
8.KLA, Hamburg
Training, Flotillas and Duties
12.41 - 07.42 4.U-Flottille, Stettin
Ausbildungsboot (under training)

08.42 - 09.43 10.U-Flottille, Lorient
Frontboot (operational)

Commanders
08.12.41 - 17.12.42 KL Friedrich Steinhoff
see also: U-873
18.12.42 - 20.11.43 OL ~ KL Fritz Schneewind
see also: U-183
Operations information for U-511
16.07.1942 - 29.09.1942
First Sailing - active patrol
U-511 left Kiel under the command of Friedrich Steinhoff on 16th Jul 1942 and arrived at return on 29th Sep 1942 after more than ten weeks.
Friedrich Steinhoff hit three ships on this patrol and all of them were in convoy, all of them from convoy TAW-15.
On 27th Aug 1942 he damaged the American 8,773 ton Esso Aruba, sailing with convoy TAW-15.
On 27th Aug 1942 he sank the Dutch 8,968 ton Rotterdam, a member of convoy TAW-15.
On 27th Aug 1942 he sank the British 13,031 ton San Fabian, part of convoy TAW-15.

24.10.1942 - 28.11.1942
Second Sailing - active patrol
On the 24th Oct 1942, U-511 left Lorient under the command of Friedrich Steinhoff and after five weeks arrived at return on 28th Nov 1942.
31.12.1942 - 08.03.1943
Third Sailing - active patrol
U-511 departed under Fritz Schneewind from Lorient on 31st Dec 1942 and arrived at return on 8th Mar 1943 after nine and a half weeks.
Fritz Schneewind hit one ship on this patrol.
On 10th Jan 1943 he sank the British 5,004 ton William Wilberforce.

10.05.1943 - 07.08.1943
Fourth Sailing - active patrol
U-511 left Lorient under the command of Fritz Schneewind on 10th May 1943 and after more than twelve weeks arrived at return on 7th Aug 1943.
Fritz Schneewind hit two ships on this patrol.
On 27th Jun 1943 he sank the American 7,194 ton Sebastian Cermeno.
On 9th Jul 1943 he sank the American 7,176 ton Samuel Heintzelmann

The plans to tow rockets to fire at New York was some way off when the war ended - something which might only have succeded on paper and was far removed from the reality of the war at sea.

I have seen photos somewhere of rockets being launched from the deck of a U-Boat , similar to those shotbread has posted- but where ??

U-511 was given to the IJN at Kure on 16/09/43 a personal present from the Fuhrer - renamed Satsuki she was later renumbered as RO-500.
The German crew were returned to Singapore in order to take on the Ex Italian boats Lugi Torelli and Reginaldo Giuliani
Certainly the association with Penemunde is interesting.
The mineshafts of the mine layers developed by the Kriegsmarine - these played a part in the development of launch systems for nuclear misslies from submarines - for their time a very advanced system.