On Sat, 10 Dec 2016 13:51:17 -0800, Oren wrote:

Hovercraft can cross land. Airboats can cross swamp - but on dry land
they are pretty well useless

Might want to check your facts : )

https://www.youtube.com/watch?v=E_PTaTTkXus

Cousin Airboat Captain Swamp Billy

They have improved grin

https://www.youtube.com/watch?v=FtFRwRWsfJs

Back in the day they were just a big block caddy engine with a wooden
plane prop ~ 150 MPH.