Hasler Tel recorder, used on airplanes; furnishes on chart permanent record of engine speeds attained every second, time and duration of flights, time and duration of stops, time of day in hours and minutes, flight hours, idle time, trip revolutions, total revolutions; indicates to pilot true speed development of engine and how it is functioning.
Engine revolution indicator and recorder for aircraft
Aero Digest
Aero Digest ; 12 , n 2
1928
2 Figs.
Aufsatz (Zeitschrift)
Englisch
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