Thread: Trim adjustment??
07-12-2008, 04:24 PM #1
- Join Date
- Jul 2008
Why is there no power trim on ultra 250x?
07-12-2008, 04:46 PM #2
07-12-2008, 04:54 PM #3
07-12-2008, 07:29 PM #4
07-12-2008, 07:42 PM #5
as to whether it hurts handling or not..........here is a quote from pwcoffshore website:
"Pump Wedge: Consider a 1 degree pump wedge which will likely take a little more of your bow out of the water resulting in higher top end speeds, however count on a less stable ride. Test it and determine what works best for your setup. Many offshore endurance riders think hard about installing a pump wedge as it tends to result in a slight loss of stability. 8/1/2007, we upgraded one of our ULTRA250's with a 2 degree pump wedge. We are seeing speed gains - this rider is 200 punds. 1 degree recommended for lighter riders."
This is from Riva website: Pump Wedges substantially improve the top-speed of your craft 1~2mph. The precision-machined 2-degree wedge trims up your pump nozzle raising the bow of your craft for less drag. RIVA Pump Wedge features a unique double-sided lip to retain silicone sealant and prevent cavitation. Constructed of aircraft grade anodized aluminum.
NOTE: We do not recommend installing our Pump Wedge without installing an aftermarket intake grate such as our Top-Loader Intake Grates (RXP part# RS22050 / GTX part# RS22055). Our Performance Development Team has found that installing the Pump Wedge without an aftermarket intake grate causes the craft to handle unpredictably.
so...when ur carving the buoys.....u want that hull down in the water as its ur hull and sponsons that r 'digging' into the water to help u stabilize ski as u take corner at high speed........then trim up on the straightaway to lift ur hull out of the water so u can maximize ur straight-line speed until u reach the corner again ...which u want to be trimmed down again.....this is the way the R&D Auto-Trim nozzle kits work....they do this automatically
Last edited by Rip'nTear SHO; 07-12-2008 at 08:53 PM.
07-12-2008, 09:45 PM #6
I have put over 100 hours on an Ultra 250 with a 2* wedge and have NEVER felt an unpredictability out of it...........But I guess if its in print on the Internet it must be true.................
07-12-2008, 10:06 PM #7
if you guys want trim adjustment,
just ask a AUSSIE to build it, we can do black magic over hear
07-12-2008, 10:06 PM #8
wish we could all be so lucky.......
it all comes down to ur riding style and riding conditions......if ur not pushing the limits of ur ski in variable riding conditions, ur not gonna experience it.
Last edited by Rip'nTear SHO; 07-12-2008 at 10:12 PM.
07-12-2008, 11:38 PM #9
The Kawi is no exception to the laws of physics or Hydrodinamics but the Stock Ultra does benefit by using the wedge.
Ya see the LX model of the Ultra has the wedge, in the 250 they pulled it out causing the nose to plow. So badly does it plow, that in hard turns the nose would actual sub. By using the wedge on stock boats the nose would not sub making for dryer and better turning.
I dont object to your input but I must say that 250 does benefit from the wedge though in other crafts your quote is sooo true. I will say also that the wedges take away the offshore advantage that the 250 has.
07-13-2008, 12:16 AM #10
I love hearing posts about the characteristics/hydrodynamics of the different skis.....i had heard that the Ultra 'plowed' and that was why it was such a good offshore hull.....but i didnt realize that it would 'sub' during high-speed cornering..........hmmmmmm
so if u were building a CC Ultra......use a 1-degree wedge and offshore a 2-degree wedge?
Makes me wonder why Kawi took the wedge off.......just from a safety standpoint.....'sub-bing' at high speeds = human shot-put.....wheeeeeeeeeeeeeeee
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