It is pretty clear that Lindemann worried about the Flak problems and wrestled with them. Even in port Bismarck scored no significant hits on high altitude bombers under 'live' condition; however, this is not a fair statement, since Bismarck was limited by keeping a low profile during bombing raids in Hamburg and Kiel. Here is Lindemann's proposal to the EKK Erprobungskommando für Kriegsschiffneubauten - Testing Command for New Ship Construction as early as 31 October 1940.
DRAFT Translation : Ulrich Rudofsky
Attachment to Testing Command for New Ship Construction Report No. Secret 5318/1940
At Sea, 31 October 1940
Testing Group “Bismarck”
Report No. Secret 120 Ordnance Officer [Wa. O. = Waffen Offizier?]
For information only:
The Command Battleship “Bismarck”, [present] post office location.
Subject: Relocation of 3.7 cm twin Flak and 2 cm Flak [L] 30.
For Action by: Testing Command for New Ship Construction test [group “Bismarck”].
1. The 3rd and 4th 3.7 cm of the upper “Mastdeck” [USN 04 Deck, RN Signal Deck] are improperly positioned, and they have a relatively small sweep angle in lateral their bearing as well as in elevation. This is principally caused by the forward rangefinder rotary dome, and from above by the protruding equipment of the mast, yardarms, and antennae, and laterally and abaft by the night recognition signal lanterns and signal halyards attached to forward signal spreaders, as well as by the forward Flak fire control station and the foremast rangefinder stations.
In order to achieve larger sweep angles and, therefore, more effective utilization of these weapons, they must be assigned a location that is farther forward and laterally farther outboard. This can only be accomplished by the relocation of the weapons from the upper 04 deck to the lower 03 deck [RN No. 2 platform deck] at the location where presently both of the bearing compasses were mounted. These bearing compasses, according to the ship’s command, are not necessary and can be dismounted and removed from shipboard. The deck must be modified on both sides for mounting of the guns by construction of 0.4 m high pedestals with an appropriate diameter of operating radius, and they must be built out in a swallow-nest-like shape like that of the bridge deck that lies below it. The operating radius is not to be fully extended outward, because deployment of the guns toward the lee side will not be required. The support cylinders [columns?] are to be attached to the deck structures. The relocation of the two bulkhead [compartment] doors of the bridge deck, as well as the life raft lockers on the 03 deck will be required.
2. The 3rd and 4th 2 cm Flak [L] 30 that are presently located on the lower mast deck [Unteres Mastdeck = 03 deck] must also be relocated, and, namely, to the space that was freed-up on the upper mast deck [Oberes Mastdeck = 04 deck] by the removal of the 3.7 cm. In order to achieve the largest possible elevation angle also for these weapons, they should be placed as far forward as possible along the railing, taking into consideration their operating radius. Furthermore, the “Jesson” signal horns [fog and navigation?] and the racks [retainers, brackets] for the NES [? Perhaps: Nebel-Erzeuger-System = Fog or smoke generating system?] must be moved far enough aft so that they are clear of the line of fire.
3. The 1st and 2nd 2 cm Flak 30 are in position on the forecastle and are severely exposed at sea to wind and boarding seas. Their manning is only permissible on a calm [becalmed, moored] ship. It is, therefore, necessary that the 3rd and 4th 2 cm Flak 30 that are to be relocated to the upper mast deck [04 deck], be replaced as soon as possible with twin mounts, in order to also secure complete forward Flak protection [when underway] at sea.
4. The 11th and 12th 2 cm Flak 30 that are mounted on the upper deck level of the leading edge of turret “D” can be folded down [can be stowed]. They have a restricted sweep angle here, and they can only be engaged when the aft 38 cm turrets are not firing, i.e., when they are in their lash-down [resting, frapped] position.
In order that both these [Flak] weapons can be deployed to full advantage, the required base mounting plates for both sea and port emplacement must be installed. For the mountings while in port, the locations on the quarterdeck [poop] on both sides of the descending gangway at frame 19 have been chosen.
The base mounting plates for the emplacement at sea are to be installed on deck behind the aft night director stand [night fire control station].
In order to obtain the required radius for operation of the weapons, the deck must be sufficiently lengthened towards the stern. Later, the command “Bismarck” will request that these stands be equipped with quadruple mounts.
The placement of the defensive incendiary bomb launchers [literally: enemy fire bomb throwers], which were also planned for this space, can be installed somewhat more forward on both sides of the aft stand.
These proposed layout options offer the best possible exploitation [utilization] of these weapons at sea as well as in port.
5. Therefore, it is requested that permission for the execution of the proposals 1., 2., 3., and 4. be procured immediately in order that the relocation of the weapons can still be accomplished while the finishing work is being completed.