i remember some thread on hot boat about the discusion of jet drives making the boat go foward by the force of sucking or pushing the water. Lets hear your thoughts!
Its all thrust. If it were suction, in theory we would suck the boats underwater.
So my guess is you never owned a 'stand up' Jet Ski and blasted yourself in the NADS trying to get going in deep water! Its a quick education on how a jet works. LOL!ok, maybe stupid question then, or i just dont realize something simple here......when we ride with the diverter all the way up and the nozzle spray is going up in the air........wait a min i think i just figured it out...like jets4fun said, i guess if i strapped on a pair of roller skates and opened up that fire hose, i would be zinged across the parking lot.......so its the motion of water passing through the nozzle creating the thrust?
Well, not really. The boats buoyancy is greater than the suction of the pump. When under way the pressure of water being fed into the pump might be slightly greater/less what's being expelled Too much water charged at the suction housing passes under the "suction" housing and the term over stuffing the pump is at play. Either way, the forward momentum of the boat and the hulls buoyancy and ability to get on plane over comes the impellers ability to "suck the boat down". At idle in shallow water it can suck debris up from the bottom. Now if the pump by itself was to magically spin somehow by itself then it would indeed suck itself into the water...but...with the pressure of thrust exiting the other end would still move forward.Its all thrust. If it were suction, in theory we would suck the boats underwater.
Well to a point sure it is, no matter how much water is infront of the impeller it's still sucking it in via the blades...but, if the intake is "overcharged" by water being "forced" into it, the excess it can't ingest simply blows under the suction housing.... As speed increases, the impeller is not sucking, it is using and compressing water that is being forced into it.