40 mm Bofors AA guns made in GB and US

[Godwin Hampton]

Originally posted by Stellan Bojerud
The NL guns should have the m/35 FC (picture).

.......also known as the Course and Speed Sight.
This was/is a very ingenious piece of equipment. It is fairly complex, and must have been pretty expensive in those days.

It can be described as an on-board predictor, and from the data fed into it, it mechanically turned both sights left or right, as well as tilting the sight bar to incline the sights up or down. This so that the layers would keep the sights centered on the target while the barrel would be delivering the shells to the 'future position' of the aircraft.

Data would be inputted by turning the two handwheels, one to set the predictor to the range to the target, and the other to set to the aircraft speed. The pointer on the arc was for setting the angle of dive.

Maybe Rob Fast would be so kind as to post some pictures giving us more details of this intriguing piece of equipment......