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  #11  
Old 03-25-2013, 07:29 PM
88 PS190 88 PS190 is offline
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The speed over ground vs speed over water issue is less important for slalom skiing.

Recall if you buy a new boat your only option is ZO and therefore you do not have any speed over water measurement, unless you manually measure speed in water (pitot or paddlewheel) and then adjust your gps speed accordingly.
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  #12  
Old 03-26-2013, 04:45 PM
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CCAnderson CCAnderson is offline
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Quote:
Originally Posted by 88 PS190 View Post
The speed over ground vs speed over water issue is less important for slalom skiing.

Recall if you buy a new boat your only option is ZO and therefore you do not have any speed over water measurement, unless you manually measure speed in water (pitot or paddlewheel) and then adjust your gps speed accordingly.
I strongly disagree. using a 2 mph river current and a course fixed to the river bottom and 34 mph nominal ground speed the skier "sees" the bouys at the speed (same time through the course either direction) however the water feel under the ski will be like 36 upstream and 32 downstream.

The same for wakeboarding or surfing. water ever the current speed will be your plus on minus.
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  #13  
Old 03-26-2013, 07:32 PM
88 PS190 88 PS190 is offline
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So you're saying that in slalom skiing you would adjust your speed so the skier "sees" the water at 34 mph, regardless of current... As opposed to setting the boat to 34 mph over the bottom.

What you are saying does not escape me - but in slalom or jump you're going to compensate so that your speed over bottom is fixed, therefore lack of current compensation does not matter for these events - of course you are going to feel like you are going fast or slow, but unlike trick or wakeboarding, or surfing where you can adjust your speed to give you the "water speed" you want, in slalom or jump you would not do so.

8.05 Boat Speeds
All speeds are “speeds over the bottom”; compensate in all cases where a current
exists. The boat path in all events is intended to be a straight line, run at a constant
speed. Variation in speed during any pass may not exceed ± .8 kph (.5 mph), except
during the second segment in the jump course when using the optional faster second
segment option. In the Slalom and Jumping events, the recorded times through the
timing segments must also be within the applicable tolerances. (See Rules 9.06,
9.17, 10.06, 10.17, and 11.06, and the Timing Tolerances Tables.)
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  #14  
Old 03-26-2013, 07:43 PM
rodltg2 rodltg2 is offline
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I am pretty sure you can keep PP pro and just upgrade the module to work with TBW. Maybe even find a used one and save some $.
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  #15  
Old 04-02-2013, 04:54 PM
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CCAnderson CCAnderson is offline
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88

I'm not saying that you adjust the speed for current because, like you pointed out in the rules, the courses are fixed to the ground therefore the ground speed must be used.

GPS speed control will always be "ground speed" unless there is something I don't know about the systems using a paddle wheel in different modes. I have never used GPS on the river so I can't say for certain.

Personally I would hate to be constantly adjusting the speed every time I turned around or for different sections of the river. Sloughs are slower than the channel because of the wing dams and the river is a living creature constantly changing in width and depth so the current must change with it. I know my wife would dislike me constantly reminding her to adjust for upstream , downstream or this section or that. Especially for trick or wakeboard where tenths of MPH are significant.
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  #16  
Old 04-02-2013, 05:12 PM
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east tx skier east tx skier is offline
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I'm going to try to hit the high points.

On a 2005 MCX, Perfect Pass is your only option. SG with Zbox will approximate the feel of zero off. Assuming you have the wide gauge, you can upgrade your master module, add a gps receiver, and add a zbox. Or, you can add the zbox later.

If there is a slalom course involved, speed over ground (relative to the buoys) is the only important variable. Yes, the water under the ski will feel faster with a current. But as far as scoring slalom, it is basically a timed run through the buoys, no matter what the water is doing under the ski.

For tricking, free skiing, boarding, surfing, etc., you can put PP in practice mode and manually adjust for the current. In my experience, the paddle wheel never worked all that well for holding speed. That said, if you ask PP nicely, there is apparently a version of the software that will jump over to the paddle wheel when you tell it you are in a river current. But, again, if you are in a course, not only is it not kosher, so to speak, but the pull with that paddle wheel dictating changes, is going to be absolutely horrible.
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  #17  
Old 04-10-2013, 11:55 AM
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I agree with East TX skier but not having the paddle wheel is even worse. I cutting the 2 inch hole in the hull for the paddle wheel this spring just to get better speed control for my nephew.
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  #18  
Old 04-10-2013, 12:22 PM
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east tx skier east tx skier is offline
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Quote:
Originally Posted by CCAnderson View Post
I agree with East TX skier but not having the paddle wheel is even worse. I cutting the 2 inch hole in the hull for the paddle wheel this spring just to get better speed control for my nephew.
That has not been the case for me. I replaced my paddle wheel with a depth finder since Stargazer no longer takes any signal (other than water temp) from the paddle wheel. No issues. Pulled a high level trick skier recently, and he had no complaints whatsoever with the pull in trick mode, which was taking speed solely from GPS.

This was not in a river current, however.
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