Finally got some stick time and recorded a 12 minute flight where I caught 3-4 thermals including one to 580ft over the span of 12 minutes. This was at thermal setting of "3" using the Ventus as modified above. The recording file is a whopping 39MB. Yikes! This is baffling because as far as I can tell all the playback gives you is the correct model and position over time. It zips to 11MB but this is still puzzling why it should be so big for so little information.

If someone can volunteer some web site space, I'll upload the zipped file.

Clark