DT Delta kite calculator

Enter a number and click 'calculate'. Enter 1 for the plan at scale size. 1.5 for the plan scaled up by 50%.

Dimensions (scaled to %)

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A height' . $height .''. number_format(($height / 2.54) , 1, '.', '') .'
B width of wing* ' . $widthofwing .''. number_format($widthofwing / 2.54 , 1, '.', '') .'
C width of cell ' . $widthofcell .''. number_format($widthofcell / 2.54 , 1, '.', '') .'
H width of kite ' . $width .''. number_format($width / 2.54 , 1, '.', '') .'
D Leading edge (LE) ' . $LE .''. number_format($LE / 2.54, 1, '.', '') .'
E nose to LE spar ' . $distancetoLEspar .''. number_format($distancetoLEspar / 2.54 , 2, '.', '') .'
F nose to spreader ' . $nosetospreader .''. $nosetospreader / 2.54 .'
J box width ' . $boxwidth .''. number_format($boxwidth / 2.54 , 1, '.', '') .'
box width (without hem allowance) ' . $boxwidthminussewing .''. $boxwidthminussewing / 2.54 .'
K box cut out depth ' . $boxcutout .''. $boxcutout / 2.54 .'
wing clip radius ' . $wingclipradius .''. $wingclipradius / 2.54 .'
box LE half ' . $boxLEhalf .''. number_format($boxLEhalf / 2.54 , 2, '.', '') .'
cell side ' . $cellside .''. $cellside / 2.54 .'
width of box back ' . $boxback .''. number_format(($boxback / 2.54) , 1, '.', '').'

Spars

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LE spar ' . $LEspar .''. number_format($LEspar / 2.54 , 2, '.', '') .'
spreader ~' . number_format($spreader, 1, '.', '') .'~'. number_format($spreader / 2.54 , 1, '.', '') .'
longerons ' . $longerons .''. $longerons / 2.54 .'
cell ' . $cell .''. $cell / 2.54 .'
wing spar "scale factor" ' . $sparscalefactor .'' . number_format(($sparscalefactor *1.08) , 2, '.', '') .' (+8%)
longerons ' . $sparscalefactor .'' . number_format(($sparscalefactor *1.08) , 2, '.', '') .' (+8%)
spreader "scale factor" ' . $spreaderscalefactor .'' . number_format(($spreaderscalefactor *1.25) , 2, '.', '') .' (+25%)

Relative size

'full scale'
kite reference size

scaled %
your kites size

Sail area

Recommended line

Plan

http://www.richmondairforce.com/Files/DTplans.pdf

This page's source code

for what it's worth, this code is free download