On Apr 30, 11:50 am, Charlie Axilbund wrote:
My flying club has recently started charging out its 172's based on tach
time rather than Hobbes time. In my experience fixed pitched airplanes
I've rented have been charged out based on Hobbes, while constant speed
airplanes have been charged out based on tach.

So recently, a friend and I took a 172 to do some pattern work. We were
out a little over an hour according to the Hobbes meter and our
wris****ches, but the tach registered about half that.

Because all the time on taxiing and all the time abeam when you pull
power are virtually free.

-Robert, CFII