Thread: Jetwings Sponsons - Test Results
10-15-2006, 12:24 PM #1
Jetwings Sponsons - Test Results
I arranged with Jerry to try a set of the Jetwings sponsons on my GP1200R ski. (1300 cylinders - 78 MPH)
The set of sponsons I received came with no mounting holes drilled and with no spacer plate which is required to space the sponson away from the hull (because of the insert bolts).
I made my own spacer and drilled my own holes. The 1st test I ran showed a .5 mph speed increase which also came with quite a bit of porpoising. The ride quality was so poor with this set-up that I felt my ski was unsafe to ride so I immediately removed the sponsons from my ski.
My ski set-up is descibed in detail here:
This is basically the same set-up that many of us use with an angled R&D plate, shimmed trim tabs etc.
Another forum member shared with me the GroupK mounting position so I did a 2nd test using this mounting position. For this test I wore a helmet and a neck brace and yes I was very nervous. Same result, ski would literally hop out of the water at speed. This test was done a couple of months following the 1st test and my rideplate / trim tabs position had been better tuned. This time I did not see any speed increase when I changed the sponsons.
Some of you might recall the GroupK testing was very positive. I am guessing with our angled rideplates our set-ups are very different from what GroupK used when they tested the sponsons so I don't think the testing they did can be applied to our skis.
Jerry has since told me the sponsons will now come predrilled and a spacer plate will be included. He said my mounting holes were in the wrong position and that is why they didn't perform as advertised.
With a total of 4 high speed runs on the Jetwings sponsons I returned them to Jerry.
The sponsons that are currently on my ski are stock stepped and when I play on a buoy course I use a set of R Pot CF sponsons.
Last edited by philip_gpr; 11-16-2007 at 08:08 AM.
10-15-2006, 02:07 PM #2
Thanks for the results on these Philip.
11-15-2007, 05:34 PM #3
11-15-2007, 06:29 PM #4
- Join Date
- Apr 2007
Were these sponsons tried on a ski running without trim tabs?
11-15-2007, 06:35 PM #5
- Join Date
- Dec 2006
- Crest Hill, IL
11-15-2007, 09:17 PM #6
I was just about to ask.... "what are jetwings sponsons then"...????
Did a quick search... and again ...!!!!
I'm slightly confused as to how they could even do their intended function..
There's nothing more than a goldfish's fin for controlling the turns..??
I wouldn't like to get twatted on the nut with them slicer dicer's..???
Any reason why you regurgitated that particular thread..???
11-15-2007, 10:38 PM #7
Thanks for the info Philip,we all take hits now and then.Its part of the game.Thanks though for sharing.
11-15-2007, 10:52 PM #8
I know that you have lots of stuff for all ocasions and have promoted free info for all to go fast. Stepped sponsons as you have addrerssed slow you down. I am confused
11-16-2007, 08:04 AM #9
The testing was done with an angled rideplate and shimmed, cut R&D trim tabs. Even with the shimmed trim tabs the ski porpoised so badly it was unsafe to ride.
Trying to use the Jetwings with no trim tabs would be UNSAFE.
The sponsons that I use most often are a set of Danny's stepped sponsons. I use these sponsons with either both my angled speed plate and my Shred plate.
My thoughts on stepped sponsons are as follows:
- back in 2003 on my stage II GP1200R they slowed me down a bit, though if you look at pictures of the todays skis (with a lot more HP) the sponsons are entirely out of the water so maybe now in certain cases there would be no speed loss
- but stepped sponsons also help stabilize the ski allowing you to use a looser rideplate and trim tab set-up so the net result is the ski can be set-up to be faster
- With an angled rideplate I always use my set of Danny's stepped sponsons
- with my Shred plate I sometimes use a set of CF sponsons that are not stepped
Last edited by philip_gpr; 11-16-2007 at 08:07 AM.
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