Does anyone have experience with the vibration activated hour meters, the ones with the 8 year battery?
Specifically the ENM ones, as sold by Aircraft Spruce (and others): http://www.aircraftspruce.com/catalo...clickkey=49513 I help maintain some vintage aircraft types that don't have recording tachometers, or electrical systems, and I thought these would be good for tracking hours, but we put one in my dad's Tiger Moth, and after about 6 hours of flying the ENM meter showed 14.1 hours. If they're that inaccurate they're worthless, or maybe we got a bad one?





-