You can build a tapered shim between part 10 and 550. You can build an offset pin to replace parts 680. Usually there are bushings, sometimes...

so reducing power makes it less squirrely. so, one idea is to get the nose out of the water by changing the hull. Another idea is to get the...

I missed where someone said that. To the OP, did you say it gets unstable when you reduce power? Symptoms would be it turns VIOLENTLY sideways...

smiles...... So you are saying change the hull so it goes faster, but don't change the jet angle because if it goes faster due to the hull, that...

Wow. What happens when you chop throttle on a boat on plane? It continues onwards slowing down. Further, shockingly enough, jetboats don't...

Lift the nose more, and you'll get the jet intake out of the water. The more power you apply, with the jet forward, the more it sucks the nose...

Given a fixed power input (V8 engine), you'd think the max RPM the engine made would change as a function of velocity. In other words, if your...

So, continuing on. Thrust is Mass flow * Net Velocity of water. If the boat is going 35, and the jet stream comes out of the boat at 70, the net...

No, I saw it, and appreciated it. And if you look, I said much the same thing at the same time, but it took a bit for others to figure it out....

Ok, so if I'm understanding this correctly, one could think of the thrust (out) out the back of the nozzle as "gross thrust", and if we take gross...

so once upon a time I took a physics class, and it turns out the relative position gets confusing for me. So........ velocity out in...

Interesting.

so, I'm still trying to understand this. If the boat is standing still in the water, the intake velocity is "zero". I get that. So let's say...

I get confused with your use of "accelerate". I think of the pump as a continuous system, not discrete particles, so "accelerate it twice as...

You were right, and I was wrong about the equation. It is indeed mass flow rate, and not mass. using your analogy, if I shorten the gullet of...

I had an idea. Take a propeller powered boat. Let's say the boat has very small drag, 10 pounds of drag at 30 mph. Let's say the propeller...

No. The article the OP posted clearly describes Net Thrust, Gross thrust, and the relatively trivial effects of the propulsion method on the...

Interesting. Every other engineer, physicist, and math guy calculates thrust as F=MV and treats it as a momentum exercise. The OP provided...

cant' tell you what "required" thrust is in relation to net. Here is how i look at it this week. You are cruising across a lake at 30 mph....

I'm trying to understand it as well, and take this as my interpretation. Gross thrust is nozzle area times PSI in the pump. It tells how much...