Let's say someone (not me!!) is crazy enough to buy a Cessna 152 or 172
and instruct in it at a towered airport. What sort of ratio of Hobbs
to tach time would you expect?

The value (I've played with .85 up to 1.0) has a surprisingly large
effect on how much you have to charge for the plane.

--
Ben Jackson

http://www.ben.com/