This next bit is really sad.
Setting up for a normal, high level, computed bomb run would require the nav rad to do a radar height finding. The scanner would be tilted down and the radar/nbc height switch on the CU585 set to radar. The aircraft would be flown at a steady height over a level surface. If this was a plain the terrain height would be put on the CU585 target height dial.
The radar height would then be adjusted until first flicker on the neon. The radar/nbc switch would be put back to nbc. The calc 3 height would be checked against the radar height and used if it was correct. It was fed from the pressure system and was corrected for pressure by setting a D-factor.
This height was then used to feed the calc 3 ballistics and also the calc 5 height carriage for the triangle solver to get the range marker to mesure plan range.
If the calc 3 was u/s the radar/nbc switch would be set to radar and the height voltage would be sent to rotate the calc 5 y-axis shaft and set the correct height.
At low level, below 7,200 feet the calc 3 would not calculate the correct ballistics but the difference between plan and slant range was insignificant. I think I am correct in saying that we left the switch on nbc and, as I said earlier, used a calcuated g/s and height for achieve the correct release point.
Nerdish? Sorry about that.
