RV8Squaz
Well Known Member
Hello Gang,
When deciding when to change the oil, or when an AD based on time comes due or anything else based on hours... Do you use the tach time or the Hobbs time?
For logging my flying time in my pilot logbook, I've been using the stantard Air Force technique of takeoff to landing plus 5 minutes to account for ground ops. I do it this way because I don't actually have a Hobbs and I feel like it would be pretty close to Hobbs time if I had one installed and pretty close to actual engine operating time.
I have a VMS VM1000C and it logs tach time only when the RPM is above 1500. So there is quite a bit of difference between my VM1000C tach time and the flying time I am logging. The flying time I've been logging runs about 15% more than my VM1000C tach time. So do I change the oil at 50 hrs tach time ( which is about 58 hrs actual engine operating time) or 43 hrs tach time ( which is about 50 hrs actual engine operating time).
Jerry
RV-8 N84JE 90.9 hrs ( actual engine operating time, 79.0 hrs tach time ) since 4 Feb.
When deciding when to change the oil, or when an AD based on time comes due or anything else based on hours... Do you use the tach time or the Hobbs time?
For logging my flying time in my pilot logbook, I've been using the stantard Air Force technique of takeoff to landing plus 5 minutes to account for ground ops. I do it this way because I don't actually have a Hobbs and I feel like it would be pretty close to Hobbs time if I had one installed and pretty close to actual engine operating time.
I have a VMS VM1000C and it logs tach time only when the RPM is above 1500. So there is quite a bit of difference between my VM1000C tach time and the flying time I am logging. The flying time I've been logging runs about 15% more than my VM1000C tach time. So do I change the oil at 50 hrs tach time ( which is about 58 hrs actual engine operating time) or 43 hrs tach time ( which is about 50 hrs actual engine operating time).
Jerry
RV-8 N84JE 90.9 hrs ( actual engine operating time, 79.0 hrs tach time ) since 4 Feb.