Can you guys post your results on the demi-span and ulna length?
http://www.rxkinetics.com/height_estimate.html
Doesn't seem to be very accurate for me my ulna is about 30-30.5cm which places me at 1.87-1.89 meters
Same with my demispan measurements I usually end up at about 187cm+/- because my demi span is about  92.5cm