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How did accuracy compare to purpose built bomb sights such as the Stuvi 5?Revi gun sight had a second adjustable cross hairs bar; the pilot adjusted this according to an ofset angle determined by the expected release speed, altitude, dive angle etc. He aimed at the target, pulled up and released when the second recticle crossed the target
British Bombsights were as a generalization simpler than the US types, and could not compute certain external effects. I am unaware of any serious disadvantages arising from this. There was an advantage arising from this simplicity....they were easier to use, and easier to train bombardiers how to use them....
The method of employ of the Norden was to adjust variable speed drives which then tracked a fixed object (or moving ship) on the ground. This then allowed calculation of the wind drift of the bomber (or shift of the target) and therefore and automatic calculation of the offset required, which was then automatically entered into the system. The Bombardier made adjustments to the tracking motor and the correction could be passed straight into the autopilot. The Norden required at least a 30 second straight run.
The German Lotfe 7 and British SABS II worked the same way.
However the M.XIV one had to enter the wind drift or target motion manually from either an estimate or meterological aircraft etc.
of course the Luftwaffe had the specialised Stuvi 5B for realy dive bombing.
There were a few other Luftwaffe sights around, something called a BZA (bomb ziel automat) it was used on fairly shallow attacks eg Ar 234.
Thanks gorizont. This is obviously a subject you have interest in. The term "tachimetric" sometimes spelled "tachymetric" is often used meaning 'speed measuring' with reference to some computing bombsights as well as FLAK predictors or directors.
There was a soviet/russian bombsight used of this kind as well, from 1942 or so I believe?
Primitive computing guns sights measured angular rate (from a rate gyro or generator) and added an offset in consideration of projectile flight time. More advanced systems converted to cartesian coordinates. I ammagine it was the same with bombsights.