Joints for trinagular box kite. Default is for 4mm round sticks.

####You will need:

• 6x corner
• 4x mid
• 2x mid-wing

####Recomended material and sizing:

• 4mm laminate tubes (cheaper than carbon)
• ripstop cover
• size: length 1m, triangle side 0.50m

####Update - rectangular sticks support:

• set `$fn = 4`
• notice that `inner_d` is outer diameter of the stick (= diagonal size of rectangle), so use `d = a*sqrt(2)` where `a` is side of the rectangle

Plans are copied from this site: http://www.stavimedraky.rozhled.cz/index.php?code=krabicovi