cmeseadoin
New Member
That was a great write up for people that don't know anything from a mechanical/scientific angle. I agree with it and it makes total scientific sense.
The question I have is:
I own two skis....a 1996 GSX and a 1997 GSX. Both are basically the same boat, but both have one notable difference....different nozzles. That is the only difference I can see in the entire jet pump assembly from intake area (large venturi) to nozzle output at the back. The 1996 has a nozzle that is shorter and ends flush with the rear trim ledge of the back of the boat and has a diffuser (vertical bar in the very end of the nozzle), whereas the 1997has a longer nozzle that goes several inches more out of the back of the boat and does NOT have a diffuser anymore. I think that the diameter of the 97 nozzle might be a tad bit smaller than the 1996 as well...maybe not, have not measured. I was curious why seadoo changed the nozzles from one year to the next with everything else the same.
If the 1997 nozzle is in fact smaller diameter than the 1996, is it that the venturi effect is magnified as well as the extra rotational forces are removed by a few more inches of nozzle to have to exit...so they determined that there was not enough rotational movement of the water exiting the final drive assy to justify a diffuser on this longer nozzle? I figure they did this to make some type of a performance gain since it is a later model year, but I am trying to understand it scientifically. Thoughts?
The question I have is:
I own two skis....a 1996 GSX and a 1997 GSX. Both are basically the same boat, but both have one notable difference....different nozzles. That is the only difference I can see in the entire jet pump assembly from intake area (large venturi) to nozzle output at the back. The 1996 has a nozzle that is shorter and ends flush with the rear trim ledge of the back of the boat and has a diffuser (vertical bar in the very end of the nozzle), whereas the 1997has a longer nozzle that goes several inches more out of the back of the boat and does NOT have a diffuser anymore. I think that the diameter of the 97 nozzle might be a tad bit smaller than the 1996 as well...maybe not, have not measured. I was curious why seadoo changed the nozzles from one year to the next with everything else the same.
If the 1997 nozzle is in fact smaller diameter than the 1996, is it that the venturi effect is magnified as well as the extra rotational forces are removed by a few more inches of nozzle to have to exit...so they determined that there was not enough rotational movement of the water exiting the final drive assy to justify a diffuser on this longer nozzle? I figure they did this to make some type of a performance gain since it is a later model year, but I am trying to understand it scientifically. Thoughts?
