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Frames in progressively vented sail stacks


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#1 SparkieRob

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Posted 17 February 2013 - 07:50 AM

I'm putting a stack together and I'm seeking some advice on frames. The kite order from front to back will be; Polo VTD, Vtd, Mid, Std and Std. I'm going to use link lines with the pig tails at the connection points. The frames I want to use are 4, 3, 3, 3, 2. I have considered having a 4 wrap frame in the lead kite and putting a 2 in the LE and have the rest as 3's. I have flown the combo of 4, 3, 3, 2 in 15-20km/h without the Polo and that was a work out. I know Kent's 8-Stack are all Std's and they have real heavy frames.

 

Would a stack of progressively vented sails produce less sail presure to be able to use this combination?

Can I get away just doubling up of the LE or do the verts need to be heavier as well?

 

Thanks.ani_weightlift.gif

 


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#2 West Australian

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Posted 17 February 2013 - 06:25 PM

No Advice for you, sorry.

 

But I cant wait to see that stack flying :) :)

 

Awesome Rob!


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#3 SparkieRob

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Posted 17 February 2013 - 06:38 PM

No Advice for you, sorry.

But I cant wait to see that stack flying :) :)

Awesome Rob!

Can't wait to have BOTH up together! Should be awesome.


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#4 RevWizard

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Posted 17 February 2013 - 07:05 PM

I'm putting a stack together and I'm seeking some advice on frames. The kite order from front to back will be; Polo VTD, Vtd, Mid, Std and Std. I'm going to use link lines with the pig tails at the connection points. The frames I want to use are 4, 3, 3, 3, 2. I have considered having a 4 wrap frame in the lead kite and putting a 2 in the LE and have the rest as 3's. I have flown the combo of 4, 3, 3, 2 in 15-20km/h without the Polo and that was a work out. I know Kent's 8-Stack are all Std's and they have real heavy frames.

 

Would a stack of progressively vented sails produce less sail presure to be able to use this combination?

Can I get away just doubling up of the LE or do the verts need to be heavier as well?

 

Thanks.ani_weightlift.gif

Go for the 4,3,3,3,2 first and see how well they fly. If the wind is a bit too light try 4,3,2,2,2. If it gets stronger change to 4,4,3,3,3

Play around in this area and you will surely find what you prefer.


Long John (formerly Mr. R)

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World Sport Kite Championship Judge - 2004-2005-2006(Chief Judge)
13x 1st - 12x 2nd - 6x 3rd places in 37 overall Quadline individual competitions


Web Site - http://www.johnnmitchell.com/index.html Check it out today!


#5 SparkieRob

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Posted 17 February 2013 - 07:23 PM

Go for the 4,3,3,3,2 first and see how well they fly. If the wind is a bit too light try 4,3,2,2,2. If it gets stronger change to 4,4,3,3,3
Play around in this area and you will surely find what you prefer.


I only have 1 frame set of 2's, could a set of black race rods do or does the mix of flex create an issue? Can see it being too much of a drama.


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#6 West Australian

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Posted 17 February 2013 - 07:39 PM

It should not matter at the back.

 

It will be awesome to get the stacks in the air together.

 

But who's going to take the photos?


B Series Standard, Mid-Vent and Vented In a Hard Case.

Supersonic and 1.5 Ghost SUL too


#7 SparkieRob

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Posted 17 February 2013 - 07:43 PM

It should not matter at the back.

It will be awesome to get the stacks in the air together.

But who's going to take the photos?

We'll make Kev do that!!


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#8 RevWizard

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Posted 17 February 2013 - 08:52 PM

I only have 1 frame set of 2's, could a set of black race rods do or does the mix of flex create an issue? Can see it being too much of a drama.


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You can use the RR's. I would put them before the 2's because they are tougher.


Long John (formerly Mr. R)

STACK International Executive Committee - 6/1996-6/2008
International Rules Book Committee and STACK International Head Judge - 6/2004-6/2008
World Sport Kite Championship Judge - 2004-2005-2006(Chief Judge)
13x 1st - 12x 2nd - 6x 3rd places in 37 overall Quadline individual competitions


Web Site - http://www.johnnmitchell.com/index.html Check it out today!


#9 kwmf

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Posted 17 February 2013 - 11:07 PM

No direct advice ... but I can give you some relative advice on Race Rods that may or may not be of use to you.

 

On my B2 set stack (vent, mid, std - front to back) I use 4-3-3 frames. I used to use 4-3-RR but even on the little B2 I could see the full sail at the back was flexing more than the other two. At no time was it a safety issue or a risk of anything breaking, I just didn't like seeing that extra load on the rear kite compared to the other two ... it just looked out of place to my eye.

 

Now that I have the 3 wrap frame in the back they all look uniform in their flight shape. I guess I could try a 2 wrap in the rear since that should be stiffer than the RR (and thats whats in 4/5 kites in Watty's stack so it's plenty strong enough - I've flown it), but I don't mind a little over engineering.



#10 SparkieRob

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Posted 13 March 2013 - 07:01 AM

Put up Vtd, Mid & Std stack today with frames of 3 wrap, black race & black race in reasonable wind with some strong gusts. The back kites with race frames didn't bend excessively but it was noticeable. I'll still try them when I put up the 5 at once and see. <br /><br /><br />Sent from my iPhone using Tapatalk

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#11 SparkieRob

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Posted 19 April 2013 - 05:30 AM

Quick update: Put up a four stack suite, Polo VTD, Vtd, Mid and Std with 4, 3, RR and RR. Winds were quite mild, low teens (km/h) I think. At first I thought I may have over framed the first 2 kites but after I got it into the air it didn't feel heavy at all. It wasn't nimble though. The RR framed kites had a minor amount more curve than the other two but I was looking for it.

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