I’m in a club that charges by tach hour and I’m wondering if there is an ‘optimization’ for flight to minimize the cost of a flight.
I’m understanding that in cruise setting the tach runs at clock rate, above cruise it runs faster than clock and less than cruise it is slower than clock.
Does anyone know exactly how this works out? Is it a linear device that just counts RPM so XX rotations = 0.1hrs? Or are there ‘stages’ where it runs at several different fixed rates? I can’t seem to find this info anywhere.