Still learning about my jet boat. I happened to be in the back seat and looked at the jet and was surprised to see the jet was just about all the way out of the water. Is this how it is supposed to be?
The thrust is performed inside the pump. By accelerating a mass of water. The nozzle being out of the water helps flow more water through the pump by probably a tiny percent but helps for sure at slower speeds.
Jet drive thrust is basically the same as Rocket thrust......Back in the early twentieth century, there were people who would argue that rockets would not work in space/vacuum- Nothing to push on!
The rocket- and the jet drive both work on mass/reaction; Sit on an air mattress with a pile of rocks- then start throwing the rocks...the mattress will move in the direction opposite the the rocks....Mass expelled in one direction creates thrust equal to- but opposite to that expel-lation....?
The ejected water mass is not as massive as the boat, but it is moving at approx' 60-80 mph when the boat is moving at 20-30 mph......in the opposite direction.....
(Just so you know, I recently caught myself on fire....So I'm not that fart- whoops!.....smart)
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