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Author Topic: top spreader  (Read 353 times)
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kite_pilot
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« on: July 22, 2014, 12:57 AM »

g,day all,
just wandering what the advantages or may be disadvantages of removing the top spreader please ?
will it make the kite fly better or worse ?
reduce some slight weight i suppose!
regards
glen
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smooth,peaceful winds! Smiley,in the bag so far a black/orange skyburner pro dancer,prism 4d, Smiley
Hadge
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« Reply #1 on: July 22, 2014, 02:17 AM »

Removing the upper spreader ( along with any tailweight) can give you maybe 1-2mph at the bottom end of the range at the expense of some tricks and rigidity. Because the kite is less rigid it's easier the break lower spreaders and it doesn't work with all kites.  Usually an act of desperation when you've only got a standard with you and the wind dies.
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asburyparkjohn
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« Reply #2 on: July 22, 2014, 04:39 AM »

Never go into the field without an SUL and/or Glider.

APJ
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harveystubbs
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« Reply #3 on: July 22, 2014, 06:16 AM »

Removing the upper spreader ( along with any tailweight) can give you maybe 1-2mph at the bottom end of the range at the expense of some tricks and rigidity. Because the kite is less rigid it's easier the break lower spreaders and it doesn't work with all kites.  Usually an act of desperation when you've only got a standard with you and the wind dies.

Removing a top spreader won't give you 2 mph difference at the bottom end. It will save you about 9 grams on most std kites. As the difference between most std and ul variants is up to about 60 grams this won't make a massive amount of difference. Perhaps consider removing the upper spreader and the tail weight to save a bit more?

As for the removing the top spreader only, the fades nose will be higher, taz will be nose higher, flare to fade more awkward, turtle a bit more shallow, yoyo a bit quicker, backspin perhaps a bit easier  Cool
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Allen Carter
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« Reply #4 on: July 22, 2014, 08:28 AM »

I'd say the effects of removing the US are highly dependent on kite design, so it's not really useful to generalize.

Some kite designs depend on the upper spreader to shape the upper part of the sail more than others. In some cases removing the US will widen or flatten the nose, in other cases it will loosen or narrow the nose, allowing more sail "billow". This change in the sail shape may have more to do with the change in low wind flight and trick characteristics than the small weight reduction.

Then again, on some kites removing the US has little or no effect on sail shape.

Also depends if you're talking about flying or slack line tricks. Improving the ease of low wind flying is about the efficiency of the sail in producing general lift (often referred to as "drive" in sport kites) along with reduction in drag and overall weight. Slack line tricks require different (and often competing) aspects including balance (where weight is concentrated on the kite) and specific areas of air pressure on the sail (as opposed to general or overall sail pressure).

Most any change to a kite's shape, weight and/or balance will effect some flight or trick characteristics favorably and others negatively. Sport kite design is all about compromises, and changing one aspect often brings up choices. "it flies easier in a straight line but turns like a Cadillac" would be one possible scenario after removing the US. On some of my favorite kites removing the US makes the flat spins all wonky which takes all the fun out of the kite. It could be that just keeping it in the air is enough, but you may find that degraded performance in other areas makes it unsatisfying.

These tradeoffs happen with bridle changes, tail weight changes, frame changes, pretty much any change to a kite. Chasing changes can end up being a full time pursuit. Every time you're at the field you are fiddling around trying to see whats better or worse, often being frustrated by changes to a kite's behavior that you don't fully understand or cant trace to a specific change. Modding and tweaking is a great way to learn more about kiting and end up with a kite that's "just right" but it often is a big waste of time. Most of the high quality modern kites I've flown are pretty hard to improve on.




« Last Edit: July 22, 2014, 08:30 AM by Allen Carter » Logged

Allen, AKA kitehead
kite_pilot
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« Reply #5 on: July 22, 2014, 12:14 PM »

hi guys,thanks for your chat r.e this topic!
cheers
glen
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smooth,peaceful winds! Smiley,in the bag so far a black/orange skyburner pro dancer,prism 4d, Smiley
ko
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« Reply #6 on: July 22, 2014, 06:53 PM »

just try it I have and everything I have now and previously  are not  worth flying with the us removed The best advice I have seen is buy a true SUL.. But def. try it
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have fun kurt
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