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7, 9 and 12 for a 100kg twintip rider

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BigZ
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Joined: Fri Jun 03, 2011 12:39 am
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Local Beach: Central California Coast
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Surfboards, surfboards, and more surfboards ...

Did I say surfboards ?
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Location: California, USA

Re: 7, 9 and 12 for a 100kg twintip rider

Postby BigZ » Fri Oct 12, 2018 7:21 am

alexglebov wrote:
Thu Oct 11, 2018 8:34 pm
My twintip is Cabrinha Ace 141x43, most used kite is 10m. I used 8m three times this year in the winds > 25kts. I can use 12m starting from 14kts to stay upwind. My kites are all Slingshot Rallys. The wind range I kite the most is 18-28kts. I just want to see how to properly scale the quiver when you go from 75kg to 100kg. The most obvious way is go scale by 100/75=4/3 ratio, so (7, 9, 12) would be scaled to (9, 12, 16). This is based on pure math and it feels pretty big for me, since I got used to (8, 10, 12) quiver.
I am only on surfboards now. My quiver is 10/8/6. When I had a TT my quiver was 14/10/8. I am 105kg. I flirted with a 17 a few times but never felt any advantage over 14. At 105 even 17 was not an efficient light wind kite.

sergei Scotland
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Blade Trigger 2016 10m
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Re: 7, 9 and 12 for a 100kg twintip rider

Postby sergei Scotland » Fri Oct 12, 2018 2:32 pm

For the same kite and board kite size is pretty much proportional to weight from pure physics point of view as I worked out here in a thread in September: http://kiteforum.com/viewtopic.php?f=1 ... r#p1027094

So if your 7,9, 12 are real numbers people use on your beach you would need to multiply by 100/77 = 1.298 = 1.3
If you use a bigger board by about 5% surface area (and the same make) than the 77 kg person you will need 1.3/1.05= 1.24 times bigger kite.
So assuming you do get 5% bigger board theoretical values are:
7 : 8.68
9: 11
12: 14.88
If you use 10% bigger board i.e. say 44 cm wide where 77 kg person uses 40 cm (the same lenght and make obviously),
then you can use 5% smaller kites again.
This is very rough but gives you an idea for any weight.

Obviously it only works if you know that 7,9, 12 are good for 77 kg rider at the beach in question - i.e.wind range on the beach is good.
Hope this helps
NOTE I am a beginner with an engineering approach to life (not kite expert in any sense) :-)

Havre
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Re: 7, 9 and 12 for a 100kg twintip rider

Postby Havre » Fri Oct 12, 2018 5:23 pm

alexglebov wrote:
Wed Oct 10, 2018 9:06 pm
Assuming that good quiver for a 75kg twintip rider is 7, 9 and 12, what is the corresponding quiver for a 100kg? I am thinking it should be: 8, 10, 13.
A bigger difference between being 75kg and 100kg than 1m. As an example when I´m on my 12m I will often kite with people that are out with 8-10m. Obviously also depends on how much power you like. E.g. Toby loves his power.

I´m 100kg myself. Got a 9, 12 and 17m. Rarely ever use my 9 - so if you want to go smaller than that you got to live in a pretty special place.

17-18m is quite nice. If you can´t go out with a 17m there isn´t much fun in kiting anyway (at least not for me). Dropping down to 12 means close to a perfect overlap. When the wind gets too strong for a 17m the wind usually works for a 12m (I guess this can vary a bit depending on brand, type of kite etc.). Then the same more or less happens down to a 9m. Personally I have never been to a place where a 9m is too big (going to Cape Town in February - so maybe then).

Guttorm
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Gear: Ozone edge 19 32m lines
Core XR4 13.5, 17 27m lines
Core XR3 9, 12, 15 27m lines
Crazyfly Raptor Pro 137×43
Slingshot Glide 149x46 LW 2006
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Re: 7, 9 and 12 for a 100kg twintip rider

Postby Guttorm » Sat Oct 13, 2018 8:15 pm

I am 110 kgs and use XR4 11, 13,5, 17 with 27m lines + Edge 19 with 32m lines. I also have a 9 that I use max once a year.
You should have 10, 13 & 17 and a bar with 27m lines, you need the extra lenght because og your weight. And two stiff boards also because of your weight, a light wind and a normal board bouth with flat rocker lines, the flat rocker will make your sessions much more enjoyable with more speed that you will enjoy more with your weight.

Get a Crazy Fly Raptor Pro 137 x 43, they have made it for many years so it is easy to find used. I will newer sell mine.
The Slingshot Glide 149 x 46 is a extremely good lightwind board also made for many years, mine is from 2006.


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