Aviasport tachometer

Hi James,

If I had your problem (tacho suspected of giving incorrect reading) I would use two or more independent RPM readers (a Tiny Tach or similar can be purchased very cheaply) to compare with the Aviasport.

If it turns out the Aviasport is incorrect, you can stick correction markings on the clear face of the gauge.

Be sure to check the Aviasport at ALL important engine speeds ie 2000 (idle) - 4000 (Ignition check) - 5000 (75% cruise) - 5200 (minimum climb power) - 5500  (Max continuous) - 5800 rpm (Max rpm for 5 minutes).

If you have access to a Dynavibe Propeller Balancer - you can use prop speed to calculate engine speed and balance your prop at the same time.

😈

Thanks Sean,

I own two PropTach optical tachometers.  They agree within 1 RPM across the range.

Jim

"I own two PropTach optical tachometers.  They agree within 1 RPM across the range."

Seems that you have identified the error (Aviasport) and can now take corrective action.

Although unlikly, confirming a reading using the same type of equipment (PropTach) may have a functional bias. An ignition sourced meter (Tiny Tach or similar) removes this potential. Of course may add another variable.😈