Thread: last 3 feet of hull...need data
04-28-2007, 12:47 PM #1
last 3 feet of hull...need data
gpr is the fastest hull on the water.
So my questions are:
If the gpr is X inches long,
1)from a side view where is the centerline of the engine in relation to the bottom back edge of the ski?
2)where does the intake opening start in relation to the bottom back edge of the ski?
3)where does the pump assembly sit..to the nearest 1/4"..in relation to the bottom back edge of the ski?..and what is the longitudinal centerline of the pump dimension from the bottom of the ski?
4) how far out and up does Jim's plate extend past the bottom back edge of the ski?
Now. the same questions for the honda F, and the R, and compare.
The witch of it is..i have both ski's but no time to chk this yet!
Last edited by dav_dman; 04-28-2007 at 07:12 PM.
04-28-2007, 04:00 PM #2
I will post a pic of my setup and get some measurements after i get my ride plate back.
Here is a pic of the GPR well all know so well and the intake area.
Compare to our Honda guys.
04-29-2007, 12:34 PM #3
The Yami seems shorter than the 16 inch Honda from scoop to the end of plate.
04-29-2007, 08:53 PM #4
04-30-2007, 08:53 AM #5
now we're getting somewhere...
not that longer would help..different hulls..but it's data to consider and test.
04-30-2007, 11:35 AM #6
Did someone say 2" pump extension ?
Why can't there be more Honda parts on Ebay for me to cut up
04-30-2007, 05:10 PM #7
Or you could use the R12 ride plate......which is several inches shorter. Someone on the other site mentioned that first, so I'm just passing it along.
Oh....and hello to you guys from pwctoday. For everyone else, I'm a newbi here, so Howdy!
Last edited by 1tommygunner1927; 04-30-2007 at 05:14 PM.
04-30-2007, 07:44 PM #8
the non-turbo R12 plate will add some speed TILL you start making some or big power, then it turns your R12x into a squirrelly ride and pretty much makes it un-rideable.
I like Dave's approach, and soon will have 2 R12xs to test with 2 totally different ride plate designs.
05-02-2007, 01:35 PM #9
05-10-2007, 09:54 AM #10
If you look at Turbo's ride plate you can clearly see that it kicks up in the back, like it's trying to lift the front of the boat out of the water when you have some speed. Then you compare that with the thrust angle of the pump an you can see they are fighting one another. With Shawns kit, we have the horse power. My intention is to flatten the ride plate to within a quarter degree of the hull line. Then use a wedge to change the angle of the pump UP. this will get the plane of attack on the boat and the thrust line more in agreement with one another and produce thrust Vs. velocity measurements similar to the Ultra 250 and the Sea Doo's. The remaining questions are:
-Angle of ride plate
-Angle of pump wedge
-Possible new intake pump shoe to fill the pump better at the new angle that the boat is riding
That and it will probably be squirelly.
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