Precipitation Static, USAAF Manual No. 10 Dec 1944 SBD Dauntless The APA-44 was under development

The APA-44 was under development in 1945 and ultimately became a prime component of three bombing-navigation systems

They were essentially timers for communications radios that broadcast a fourteen second carrier wave every minute

It is clearly 'experienced' but in very good condition given its age

likely to set the desired course heading

the pitot tube was employed by pitot-statically-driven instruments to perform their function

Precipitation Static, USAAF Manual No. 10 Dec 1944 SBD Dauntless The APA-44 was under developmentThis is an original training manual covering the topic of Precipitation Static published by the US Army Air Corps in 1944 for use in training pilots. The manual discusses the build up of static charge on the aircraft in flight during different atmospheric conditions and how this affects radio receiving equipment. This 36 page manual is in good condition given its age. It came to us from the estate of a B 17 flight instructor.