The loosing the roost ability was my assumption. I figured if you use a drop snoop and a 4° wedge, this well lower the center of the nozzle and its pitch. So i was thinking you would loose that ability. Yes, I do agree that the rooster tail does nothing for speed.I was always told best performace comes with the roost just barely breaking the surface.
5 -6 mph with all that would be false. with the supercharger I would also have to go from the aluminum A Impeller to a stainless 9.25 to keep the boat at the same max 5000 rpm. Here I can see a little more gas use. But with just a droop snoop, 4° wedge, loader grate and nozzle insert reducer should get me from around 3 - 5mph. But I dont see how this would waste more gas. As all I would be doing is making the boat more efficient by making the boat run less wet. I think I should see a very small improvement.
Or, make it a pig out of the hole and have the same top speed... I was referring to the adding of HP as far as the using more gas, you can't get something for nothing.
Your going to be better off IMHO putting the boat on a major diet... Your RPM at the top does not tell me your in need of a loader, may help, may not. As for the droop, you may see some attitude adjustment and get some more hull out of the water, but unless you get a few hundred pounds out of the boat, not sure you will see the expected speed gains.
The largest hurdle that you will learn on a jet boat, there is always some give and take, when your dealing with a big heavy hull, unless it is a stupid efficient design, the adjustments make a much smaller (relatively speaking) difference than on a smaller, lighter hull.
Just some more directions for you to potentially peruse;
Have you checked the bottom of the hull for a hook? Many times these hulls have a pretty substantial hook molded into them for drive-ability, don't know if this is the case for you or not.
Have you driven the boat with a light fuel load and nothing other than a driver in the boat? (goes without saying, but also a life jacket, fire extinguisher and a throw cushion
)
IMHO you are trying to get that boat to do a bit more than it was designed to do, if it was easy, there would be a lot more jets out there... Just food for thought
As for roost height, every boat and every hull design "likes" different parameters. If it were a tunnel bottom, they like about 6' off the water, if a modified vee, they seem to be closer to two or three feet, this changes with the amount of HP available and weight load.
Not beating you up, just trying to throw some useable information your way. I have been playing around with jet boats since the mid '80's, the "tricks" have not gotten very far in that amount of time.
Good luck!
GT
