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Author Topic: How does the weight distribution affect the kite pitching?  (Read 928 times)
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rudyy
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« on: July 22, 2012, 01:54 PM »

I am experimenting with the weight on the Prism Zephyr.  Flying under very strong wind, I add an extra 18g right at the location where the spine and lower spreaders cross each other, totalling 32g together with the 14g stock weight.  The extra weight tames the Zephyr down quite a bit, making it capable of flying in high wind range while at the same time keeping the Zephyr's own personality. 

Then I remove the stock weight at the very end of the tail and keep the 18g weight I add.  The kite does not pitch as good as having just the stock weight on.  It is as if flying with no stock weight but just heavier.

I guess either I have to increase the weight more or move the 18g a bit closer to the tail.
« Last Edit: July 22, 2012, 02:49 PM by rudyy » Logged
thief
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« Reply #1 on: July 22, 2012, 03:53 PM »

Check out what you can find on the level one sliding weight system......sounds like something that will interest you.
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rudyy
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« Reply #2 on: July 22, 2012, 03:59 PM »

Hi thief,  do you have a link to it?
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thief
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« Reply #3 on: July 23, 2012, 04:28 AM »

You should be able to search this forum and/or Google to find more information..... can't just give you all the info Wink
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Hadge
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« Reply #4 on: July 23, 2012, 05:14 AM »

HQ used a sliding weight system on the Infinity that would be easy to copy, just a couple of LE fittings and some steel rod weights.

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DD
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« Reply #5 on: July 23, 2012, 04:11 PM »

Jack in the box had it too
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Ca Ike
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« Reply #6 on: July 24, 2012, 12:41 AM »

The reason your Zeph won't pitch with the weight at the center T is because your changing the center of gravity and going over the amount of weight the kites design can handle in that spot.  I did a LOT of experimenting with my zephs including working on a vented version.  OTher than the vented version Mark pretty much got it right.  THere are a few bridle tweaks for going ultra low but for the most part don't mess with it.  THe design is sound as is and balances well with the existing weigh for flying to its max range.  THe MOST weight the kite can handle without major detrimental flight affects is 24G.  YOur better off flying with a loose leech line than adding weight to slow it down in higher winds.

However you don't give the wind range  you are trying to fly it in.  If your trying to fly in over 15 then consider yourself lucky your Zeph hasn't imploded, especially with the extra weight you add.  Increasing the wind range on a kite goes beyond weight.  YOu have to look at sail pressure, frame strength and a few other parameters.  I have my vented Zeph flyable up to 28 but only trickable up to around 18 so far and its not quite balanced right for sail pressure.  Oh and thats still with the stock 14g weight.
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zippy8
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« Reply #7 on: July 24, 2012, 09:29 AM »

The reason your Zeph won't pitch with the weight at the center T is because your changing the center of gravity....

I realise that this sounds a little boastful but I think that this demonstrates that CoG is a complete red herring when it comes to pitch performance.

Feel free to politely argue otherwise but do be prepared for it to be an argument.

Mike.
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