The SPB2 and SPBIV Airspeed-Altitude Recorders,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The SPB-2 speed recorder was designed for determining basic flight parameters of training aircraft, velocity and altitude variations were determined with differential and evacuated membrane boxes, and the information was recorded on a paper tape. The recording accuracy of this instrument was approximately 3. Since the SPB-2 recorder could not be used for measuring highly variable magnitudes, it was necessary to develop other instruments which would meet this requirement. Therefore, two modifications, the SPB-III and SPB-IV, were later developed. Although the two models are identical in size, their tape velocity is different. In the SPB-III model the tape translation speed is variable and averages 40 mmsec, while the model IV has a constant translation rate of 2.5 mmsec.
- Flight Control and Instrumentation
- Recording and Playback Devices