Download Nasa Para Wing bridling calculator.exe (tested on Win95, 98, ME and XP, 800 kB zipped format))
Download Visual Basic runtime  Vbrun60.exe (only needed if an error message "missing dll" occurs...)
and if it is not enough, here are the dll : Vb6fr.dll and Msstdfmt.dll

 

If you prefer Excel spreadsheets, here you will find what you are looking for.
exemple here after is directly extracted from excel spreadsheet which allows to compute all dimensions of the kite..
beware that the excel sheet is less accurate than the exe. You SHOULDN'T use it to build the kite but better use the exe.

download excel spreadsheet

type "A" length ( "Calculations" page, cell C9)

,
all other dimensions will follow.

Cutting layout is extremly simple :

• To build the kite, jump to page "sail detail" from NPW5. Technics are absolutly identical
• For bridling, it's the same, nothing has changed  for A and B lines (excepted bridles lengths)
• A11 and A12 are connected to brake line, but B lines are only connected to the main flying lines
• THE big change is (thanks Stelios !) when we add the third bridling line on the wing :
• 6 bridling points are regularly dispatched on the bottom of the middle line of the wing
• first point (C6) is located on the trailing edge, then just go up to C1.
• distance between two C points : 
• C5 and C6 are connected to a brake line. Other points are on the main lines
• finaly, NPW9b exits with two models :
• standard (or narrow) model. The "B" width of the center panel is B = A/2, there are 4 darts (K) as for NPW5
• wide model. The "B" width of the center panel is B = 2A/3, there are 5 darts (K).
• The exe is self adaptative to sail model (wide or narrow). Wide sails are more stable and powerful. Narrow sails are faster but less stable and less powerful. The default profile of the exe is a wide one.

• Bill and Tom : BillsKite2003-01-18.NPW9B.txt, the first flying NPW9b  (and what a fly !),
• Larry : Larry_2003-02-08.NPW9B.txt one month later,
• Fredrik : Buzzard_One_030622_wide.NPW9B.txt the "wide Buzzard" is now the default profile for my exe
• tip : if you want to create a narrow profile, import the "narrow Buzzard" profile, modify it and then export it.

• NEW : Fredrik has efficiently improved the NPW nose by adding an extra bridle 
• This new 'Vnose' results in less distorsion of the nose and permits the use of a more wing-like profile.

• How to do the 'Vnose' :
• suppress the T on each side of the nose (but keep the others)
• add an extra bridle going from the nose tip to the first dart (on the wing edge, where the dart is folded)
• this extra bride should have the lenght T*3.3 (could be changed as it is an empirical value)
• Tie bridle A1 (shortened in the provided "Vnose profile" by T*1.5) to this extra line with a bridle knot. This knot should be able to slide on the extra line so that A1 can find its optimal position by itself
• here is the tuned profile with this "Vnose" Buzzard_Vnose_031022_NPW9B.txt Beware that this profile could seem a bit weird as my exe DOESN'T take the extra bridle into account (for the moment :-). To see the actual profile of the Buzzard Vnose on the calculator, type in value 162.50 at box A1 with A=138 cm. This value represents an approximation of the "effective sum" of the bridle A1 and the extra bridle  Here is the full readme file provided by Fredrik on his Vnose : Buzzard Vnose readme.txt