Wolfpack – Periscopes and the UZO

Periscopes and the UZO

A type VII U-boat has two periscopes – the observation periscope and the attack periscope. The attack periscope is located in the conning tower. This periscope has a small head to avoid detection, and its optics are designed in such a way as to allow the periscope to be raised and lowered while using it. To raise and lower the attack periscope, press W or S respectively. To zoom in or out using the periscopes, use the mouse scroll wheel.

The observation periscope is located in the control room. It has a larger head to take in more light, and is shorter than the attack periscope. It can be raised or lowered using the periscope hoisting mechanism, located to the right of the map table, on the port side in the control room. The observation periscope’s ocular is attached directly to the shaft, so it cannot be raised or lowered when used.

The periscopes measure the view angle in centiradians. 1 centiradian equals 1 meter seen from a distance of 100 meters. To calculate target distance, simply divide the target height (meters) by the view angle (centiradians). This gives you the distance to the target in hectometers, which is the scale used both in the torpedo data computer, and the deck gun sight. One hectometer is
100 meters.

Both periscopes have a normal magnification level of 1.5x, and a high magnification level of 6x. To calculate the distance to the target when zoomed in, multiply the derived distance value by 4. You can also use the attack distance table by pressing “C” and clicking the distance table tab.

For example:

A 30 meter tall mast will take up 3 centiradians in your scope if the ship is at a distance of 10 hectometers (1000 meters) at the normal zoom level, 40 hectometers (4 km) at the high zoom level. Target speed can be calculated by dividing the length of the target by the amount of time it takes for the target to pass the vertical line in the crosshair when the u boat is stationary. This will give you the target speed in meters per second. 1 meter per second is 1.94 knots, so multiplying this value by two gives you a good speed estimate.

The UZO (Underwasserzieloptik) is a simple targeting system used for quick surface attacks. The UZO is essentially a pair of binoculars mounted on a pedestal on the bridge. The pedestal contains a selsyn link that transmits the pedestal rotation to the U-boats torpedo data computer, and a trigger for firing torpedoes. The UZO has no range finder, and no zoom.

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