tommy303 wrote:I believe RPC for the main guns was elevation only.
main firing procedure "Höhenfernstuerung mit Seitenvorzündwerk"
that means remote control for elevation - Seitenvorzündwerk. unfortunately I dont know a useful translation for Seitenvorzündwerk as it appears to me that there is no technical correspondence in foreign equipment, even the quality of this solution appears as technically equivalent to the US stable vertical in connection with RPC.
In the main firing procedure the guns were fired during rotation of the turret.
the correct train angle was continously held by the firecontrol computer
On the firing command the turrets with its guns were moved through this train angle and the shooting was automatically triggered by the Vorzündwerk
-as there is some delay between closure of the electric firing contacts until the time the projectile leaves the muzzle it is required to close the electrical contacts some hundredths of a seconds before the correct train angle was reached so knowing the correct times of projectilemovement within the barrel was extremely important to reduce scatter.
the german system avoids continous oscillations of the turret as in the case of complete automated stabilization for side as the ship was contiously moving around all three axes
The guns were fired by the so called "Vorzündwerk" during rotation of the barrel/turret
-at the beginning the gun house is on hold(red line) wich is not the aiming direction
-the fire control continously calculates a dynamic firing solution (green line)
at the "march through" command the turret/barrel was driven through the fire solution
attached is also a photo of Gneisenau, here you can see the different alignments of both turrets, one turret has fired shortly before this photography.
Thorsten Wahl wrote:dobble post
tommy303 wrote:The German fire control systems as used on the Hipper, Scharnhorst, and Bismarck classes were very flexible with several different proceedures being possible. Firing could be done at the director, in similar fashion to the British DFC system, or it could be done from the central fire control station by computer and automated firing mechanism in the transmitting station. If the ship were holding a set course and the sea state was not too extreme, it was possible to fire the guns directly from the director where by the director layer judged when the guns were properly aimed and fired by blowing into the mouth piece of a pneumatic tube, thereby closing the firing circuit. However, in Bismarck at least, though the ship had a small amount of roll in a sea way, the roll time was very quick (stiff); this made direct firing from the director difficult as RPC might not be able to keep up with the swift roll moment and it was too hard for the layer to judge the correct point in the roll to fire. Consequently, it was usual for the computer to measure the velocity of roll and calculate the correct point at which to fire the guns, taking into account the vertical velocity of the gun muzzles and the length of time it would take the shells to exit the muzzles. The layer would initiate firing by pressing a firing key, but the circuit would only close when the optimum point in the roll as calculated by the FC computer and set into the firing gyro was reached.
Similarly, if the ship was manoeuvring, turning, or swinging due to the seaway, or if the target was moving particularly quickly, the lateral movement might be too great for the turret trainers to keep up with. In this instance, as Thorsten points out, it was usual for the turrets to be held at an arbitrary angle of train until the firing signal came, then rotate and let the transmitting station fire the guns based on the output of the computer's calculation of the lateral velocity of the gun muzzles. The guns would then fire as the turret train reached the optimum lateral point of aim.
When a fire control circuit is "closed" that sends somewhere close to 12-25 volts of electricty through the fire control circuits to whatever caliber primer was used in the firing lock of the gun. It takes a few seconds for that voltage to reach the turrets.
That tube IMO, more then likely acts as the gunnery officers safety switch since he has "eyes on". As noted in that same picture, the wheel he is holding has the actual trigger for firing the gun.
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