no wind - I have to agree with stringfellow. The 44's (raven & raven II) are collective activated, so it is normal for schools/pilots to add 0.1 to the Datcon time to allow for the start-up.
I was once told that it was possible to stop the datcon counting in the earlier 22's if you sacrificed one of your tach's as they used one of the tach circuits, but I believe this has been addressed and it is run off oil pressure now. I don't think most people/schools worth their weight would dare mess with the clocks anyway but i'm told it used to to common practice in the mustering/spraying game so that outback farmers could avoid maintenance costs
combine that with the manoeuvres they pull (no discredit to their ability) not surprised that the accident rate was high in that game.
Aucky