herdsman:
That's a Parks & Wildlife vessel in the photo, not sure of the hull but they use a Lycoming aircraft engine. That one does a fair bit of weed spraying during and after the wet.

On the subject of weird vehicles, a mate has ripped into the pigs with a shottie from the front seat of an ultralight! Even though it was flown by the property owner on a western queensland cattle station, might not be strictly legal, so he should probably remain anonymous!