![]() Remember that sine function is symmetrical to 90 degrees, so you must check if target is closing or gets away. Next we move into some maths - very basic trigonometry, based on again a few assumptions - self explanatory.įor those who are not interested in math method, the final answer as we see is: The rest of the drawing is self explanatory. Greek alpha - observable horizontal angular width of a target ship Since it travels with unknown AoB, observable length is shorter and equals Lx (perpendicular projection of L in our scope view). ![]() We observe a ship of which length L is known from recognition book. ![]() ![]() Right part is just magnified left part of the drawing. So lets start with situational drawing which is here: we can figure out if the target is closing to us or goes away #ANGLE ON BOW CALCULATOR HOW TO#we know how to use our periscope reticle - field of view and angular scale based on magnification, both in vertical and in horizontal direction we know exactly what target we are facing, we know its length (L) and mast height (H) - easy with our Recognition Book The solution was transmitted to the Gyro Angle Regulator ( one in each torpedo room) mounted between the torpedo tubes.Įlectrical inputs from the TDC were constantly transmitted to the regulator, and an operator matched the bugs on the mechanisms dials as the gyro angle is being fed to the torpedos gyroscope via suitable linkage and spindles attached to the tubes.I was wondering about how to mathematically determine (in)famous Angle on Bow. Navy used a Target Bearing Transmitter (TBT) mounted on the open bridge, which sent the same data to theTorpedo Data Computer (TDC) located in the Conning Tower. #ANGLE ON BOW CALCULATOR PDF#Ed friedland building walking bass lines pdf download freeįrom then on, any change in the course or speed of the U-boat, or in the target bearing received by the attack computer, a new solution was calculated automatically, and the gyro angle was passed automatically to the tube-loaded torpedoes. When the u-boat was submerged at periscope depth and thus much slower waiting in ambush for example, the Officer in charge would climb to the small cabin side the conning tower above the control room and moving aft would sit in a cupola ring which he could drive around the attack periscope shaft with foot pedals.įiring solutions were also indicated on a translucent under-lit plotting table in the control room assisting the navigator to monitor and plot the action. Thus a U-boat could travel surfaced on a parallel course and still fire at a target beside the U-boat. In U-boats, the attack periscope and UZO were linked to the Vorhaltrechner, and when the target was properly aligned, the mechanical connections between the boats gyro-compass and the attack periscope (or the UZO), provided the attack computer with data about the current course and speed of the U-boat and the bearing to the target.Īfter the required data was inserted, a firing solution was achieved and the FAT torpedoes would be instructed before launch which way to turn and at what rate. They received the fire control solution (gyro angle) and fed it into the guidance system of the tube-loaded torpedoes, via retractable spindles inserted through the torpedo propeller hubs. These were located in both forward and after torpedo rooms. This was linked to a mechanical analog attack computer (Vorhaltrechner, A Siemens-built electromechanical deflection calculator) in the U-boats conning tower which fed attack headings into the torpedo launch receiver (Torpedo Schuss- Empfanger T-Schu). It was comprised two parts a set of large, pressure resistant watertight heavy binoculars and a rotatable bracket set in a degree-marked ring. Of course, plotting takes some time, and this is main disadvantage. The advantage of this method was speed - you could have these value immediately.Īfter some observations, you can clearly see the course and speed of enemy. Generally, you could estimate enemy speed and angle on bow by eye - the accuracy depended on your experience. The distance may be determined in many ways: by eye, by means of stadimeter or graticule in periscope, by radar or sonar. ![]() P.S.:here is a photo of that ring i was told they used. ![]()
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