Posted: Mon Jun 24, 2002 8:15 pm
For selecting the kite size (in m²) in relation to the wind (in knots) I propose a simple formula:
kn x m² = constant (Detlef’s Kite Rule)
The constant is in the range of 100 – 300 and dependent on the type of kite and the capability of the rider. From my experience the following values hold approximately for the lower bound <sine bows> (MIN), the optimal range (OPT) and the upper bound <pros> (MAX) for kites with projected area (Proj.) and kites with developed area (e.g. ARX and X2):
........|... MIN ...... OPT ..... MAX
-------|----------------------------
Proj.. | ... 75 .. 110 - 150 .. 180
ARX . | . 100 .. 150 - 200 .. 250
X2 ... | . 150 .. 200 - 250 .. 300
A table as overview (also presentable as Excel graph):
_m² | c100 c150 c200 c250 c300
------|-----------------------------------
_4.0 | 25.0 37.5 50.0
_4.5 | 22.2 33.3 44.4 ....... kn
_5.0 | 20.0 30.0 40.0 50.0
_5.5 | 18.2 27.3 36.4 45.5
_6.0 | 16.7 25.0 33.3 41.7 50.0
_7.0 | 14.3 21.4 28.6 35.7 42.9
_8.0 | 12.5 18.8 25.0 31.3 37.5
10.0 | 10.0 15.0 20.0 25.0 30.0
12.0 | _8.3 12.5 16.7 20.8 25.0
14.0 | _7.1 10.7 14.3 17.9 21.4
16.0 | _6.3 _9.4 12.5 15.6 18.8
18.0 | _5.6 _8.3 11.1 13.9 16.7
20.0 | _5.0 _7.5 10.0 12.5 15.0
24.0 | _4.2 _6.3 _8.3 10.4 12.5
I hope for an intensive discussion about the suitable constants for the many different kites on the market. On this basis the producers will provide their customers a comparable reference for their kites sizes.
Dr.-Ing. Detlef Teichmann,
Munich, Germany, June 24th, 2002
<font size=-1>[ This Message was edited by: Detlef on 2002-06-25 22:32 ]</font>
kn x m² = constant (Detlef’s Kite Rule)
The constant is in the range of 100 – 300 and dependent on the type of kite and the capability of the rider. From my experience the following values hold approximately for the lower bound <sine bows> (MIN), the optimal range (OPT) and the upper bound <pros> (MAX) for kites with projected area (Proj.) and kites with developed area (e.g. ARX and X2):
........|... MIN ...... OPT ..... MAX
-------|----------------------------
Proj.. | ... 75 .. 110 - 150 .. 180
ARX . | . 100 .. 150 - 200 .. 250
X2 ... | . 150 .. 200 - 250 .. 300
A table as overview (also presentable as Excel graph):
_m² | c100 c150 c200 c250 c300
------|-----------------------------------
_4.0 | 25.0 37.5 50.0
_4.5 | 22.2 33.3 44.4 ....... kn
_5.0 | 20.0 30.0 40.0 50.0
_5.5 | 18.2 27.3 36.4 45.5
_6.0 | 16.7 25.0 33.3 41.7 50.0
_7.0 | 14.3 21.4 28.6 35.7 42.9
_8.0 | 12.5 18.8 25.0 31.3 37.5
10.0 | 10.0 15.0 20.0 25.0 30.0
12.0 | _8.3 12.5 16.7 20.8 25.0
14.0 | _7.1 10.7 14.3 17.9 21.4
16.0 | _6.3 _9.4 12.5 15.6 18.8
18.0 | _5.6 _8.3 11.1 13.9 16.7
20.0 | _5.0 _7.5 10.0 12.5 15.0
24.0 | _4.2 _6.3 _8.3 10.4 12.5
I hope for an intensive discussion about the suitable constants for the many different kites on the market. On this basis the producers will provide their customers a comparable reference for their kites sizes.
Dr.-Ing. Detlef Teichmann,
Munich, Germany, June 24th, 2002
<font size=-1>[ This Message was edited by: Detlef on 2002-06-25 22:32 ]</font>