Thread: Screw the hull mod's. . .
07-13-2008, 02:38 PM #1
- Join Date
- Aug 2006
- Gonzales, La
Screw the hull mod's. . .
Screw the hull mod's. . .
RXP folks have the disadvatage of a hull that's designed for rough water and ride-quality. It's been discussed here that the GPR folks go fast by reducing hull drag. The sacrifice is stability and rough-water capability.
I have recently tried 2 hull mod's in an attempt to go faster with a fixed hp level.
1) I built a custom intake grate that blocks off roughly 20% of the opening. The result was barely any increase in top speed, but a drastically reduced holeshot (would barely get on a plane at all with GPRyan as my witness).
2) I read a book on hull design. It talked a lot about the purpose of chines and how they create lift. In order to increase the effectiveness of the RXP chines, I installed something similar to Skegs at the outter edges of the chines on the rideplate. This is to redirect the water that's split by the vee downward and create lift. They worked, as the rear-end of the ski rode noticably higher out the water than before. However, apparently, these tabs created more drag than they reduced. The result was a reduced top speed and some, let's just say, non-optimal handling characteristics. I almost bit the dust at 78 mph when I let off the throttle.
From here on out, I'm will be going after speed the old fashioned way: Brute Horsepower. It's more fun that way, anyway. Plus, the acceleration is better. I've decided that I like the nice, stable, water-plowing RXP hull. I'm going to embrace what we have. If we wanted speed via low drag, we shoulda' bought GPR's.
And besides, it's my nature to build hp to get speed, rather than the finesse route. I have a 4000 lb car that runs in the 9's in the quarter at nearly 150 mph, and a 5000 lb daily-driver truck that runs 13's stock. I guess it's just who I am... The GT32 turbo will be on the way soon. In keeping with the theme of the "Budget Bomber", I'll be going with a $750 non ball-bearing turbo rather than the $$$ BB units.
P.S. This post is mainly for entertainment purposes. Though, as they say, there's a little bit of truth in every joke.
07-13-2008, 02:48 PM #2
07-13-2008, 02:51 PM #3
- Join Date
- Oct 2005
Brute horsepower..........I agree, it is more fun.
I don't think the RXP hull is worth a damn in the rough though. The RXP-X is better due to the larger intake, but I think the only thing helping the RXP in chop is it's weight. It is a very stable hull though. I can't tip it.
07-13-2008, 03:44 PM #4
Let it be known by all ye not necessarily present either via silent acknowledgment or by nonexistent proxy that we will no longer be engaged in the fruitless pursuit of minimized hull drag and will instead employ methods of brute force to obtain the necessary terminal velocity and acceleration so dearly sought after in accordance with the Greenhulk credo of whose veracity we hold to be self evident:
"The more boost you make, the more fun you are going to have..."
Let it be said on this day, the 13th of July, of the year Two Thousand and Eight, that hull work is a girly pursuit best left to those who have minimal power or who are seeking speeds that can only be rationalized by an aberrant death wish. And, that real men prefer to be blown.
07-13-2008, 07:37 PM #5
why is this not in the rxp forum? We gpr owners like our hull, we change things but it is still very stable if not better than stock. Anyways, Ill make sure to wave at you as I pass by. LOL
07-13-2008, 08:03 PM #6
Yeah for you Mike!!
Why the hell do you need to tell us your quest for throwing more power at a slow hull???
We have been making much more speed with way less power for quite some time now. Could be the reason for all the conversion boats recently but I could be wrong.
Maybe its your general attitude "screw the hull mods" that makes it so easy for me to take down all these badass Seadoos with roughly 100+ more HP.
Get a grip!!
07-13-2008, 08:09 PM #7
I tend to think that we do not lose or sacrifice much in the handling dept when more angle is applied to the rideplate. Other factors can be applied such as shimming out trim tabs to help with rough water handling. Rideplates such as Jim's performance give us the best of both worlds.
screw the hull mods....hhmm........I tend to dissagree, its the hull mods that make our boats go faster and yes, there is a fine line. But there is a happy medium
ex. Fountain Racing has done alot of R&D when it comes to hull mods.
Last edited by RX951; 07-13-2008 at 08:18 PM.
07-13-2008, 08:22 PM #8
I do agree about the tradoff tho. For me to run 82+ I give up handling and holeshot, but at 79-80 I can dragrace and handle with any RXP which I do every weekend. Turn, burn and holeshot with anything, nothing but a podunk carbed 01 GPR with porting.
My DAUGHTERS stock 1200 with reeds and rideplate runs 74 in the summer setup for turning, whats it cost for a RXP to get there?? I've been told by a few RXP owners that have riden it that it handles amazing.
07-13-2008, 08:33 PM #9
- Join Date
- Jul 2005
- Central North Carolina
07-13-2008, 08:39 PM #10
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