I'd agree with Pace & always log time from when the aircraft first moves under its own power until the parking brake is set.
I'd also agree that you may choose, if you wish, to log time on the same basis if you do not actually become airborne providing that the intention of flight was present when the aircraft first moved.
This would also generally be in keeping with the rules for accident reporting, which is defined as "an occurrence assocated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight until such time as all such persons have disembarked".
If I'm doing something for which I could be called to account to the AAIB if it goes t**s up, then IMO that's flying time & should be logged as such.
And if anyone is also reading the PA-18 thread, several of the posters there are saying the hardest part of flying the Cub is taxying the aircraft.
Last edited by Sillert,V.I.; 29th Oct 2012 at 19:50.