Mach Speed Indicator, .3-1 Mach, Aero Commander/IAI Westwind Lily Bomber for the US Army Air

for the US Army Air Corps

The system consists of a motor-driven speed sensor and a display instrument

It covers instruments

The two neon bulb holders are in place

Mach Speed Indicator, .3-1 Mach, Aero Commander/IAI Westwind Lily Bomber for the US Army AirThis is Mach Speed Indicator, or Machmeter, was made by Kollsman for an Aero Commander aircraft as it is made to an Aero Commander part number, 3883063 1. Likely made for an Israel Aircraft Industries (IAI) Westwind (formerly Aero Commander 1121 Jet Commander). Measures ~3. 25 inches diameter and ~4 inches deep. Can't tell how fast you are traveling relative to the speed of sound without a Machmeter!