Excellent answer Aucky,
and Baobab yes there is a hole there, surprise surprise.
Now, if your moniker is indicative of residence in the upper Kimberly I suggest that during the tropical wet season you take particular care in examining, the upper parts of the lower sheave for foreign objects before start. One day I had my usual quick look about, started up and as usual stayed outside to examine for oil leaks etc., just in time to see a large green frog go round on the first revolution of the belts and be spat out on the ground, then shook its silly head and hopped off.
Another very wet day some minutes after take off, one lumbered up onto the top of the inst console and had a good look about at the weather as if to agree with me that it was - rather patchy.
cheers tet.