Field of view of the 1A40 sighting complex.
1. FoV from manual
2. FoV real
3 and 4. 1A40
1/
1. FoV from manual
2. FoV real
3 and 4. 1A40
1/
The "Ballistic Computer" of the 1A40 is this two Nomograms in right side of the gunner.
In the left one we find the correction "Sigma 0", in the right one the "Sigma M", then we add them up and enter the result into the sight using the Potentiometer (in red circle).
2/
In the left one we find the correction "Sigma 0", in the right one the "Sigma M", then we add them up and enter the result into the sight using the Potentiometer (in red circle).
2/
EG.
Left:
- Charge temperature is -20°C, barrel bore wear - 0.5 mm. "Sigma 0" will be + 1.8%.
Right:
- Atmospheric pressure is 650 mm Hg., air temperature is -20°C, "sigma M" is -1.8%.
- 1.8 + (- 1.8) = 0%. This means that the correction potentiometer should not be touched.
Left:
- Charge temperature is -20°C, barrel bore wear - 0.5 mm. "Sigma 0" will be + 1.8%.
Right:
- Atmospheric pressure is 650 mm Hg., air temperature is -20°C, "sigma M" is -1.8%.
- 1.8 + (- 1.8) = 0%. This means that the correction potentiometer should not be touched.
This is the short excursion how the gunner work before the TBC invented 😜😊.
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