CPU-26A/P flight computer (1957, 1962) : speed calculations on the original "pocket-sized" E-6B

Описание: In March 1957, the Air Force Equipment Laboratory designed a 2/3 "vest pocket" sized flight computer: the CPU-26/P (Rau, 1967). Feature-wise, it was identical to the larger MB-4; only the form factor was different. The original CPU-26/P computers were prone to breaking when pilots stored them in their shirt pockets, and thus, in 1962, the CPU-26A/P was re-introduced with an aluminum slide (Rau, 1967). The all-aluminum flight computers were well built and designed to last; they are commonly found (in great condition) on auction sites.

In our continuation of exploring the new features added in the MIL-C-5414 spec, this video focuses on airspeed calculation improvements, including: the extended ranges for pressure altitude and air temperature, the F Correction Table for air compressibility, and the mach number index.


00:00 – 1. Introduction and history
01:51 – 2. Airspeed correction improvements
03:09 – 3. F correction factors for TAS
04:13 – 4. Finding TAS on the extended scales
05:09 – 5. Finding TAS corrected for air compressibility
05:59 – 6. Mach number calculation
07:06 – 7. Conclusion


Appearances: Computer, Air Navigation, Dead Reckoning Type MB-4 (Felsenthal, 1958); Computer, Air Navigation, Dead Reckoning Type CPU-26A/P (Felsenthal, approx. 1969); U.S. Army Air Forces AN5835-1 (Cruver, 1943)

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