_RL exf_inscal_vwind
& exf_inscal_vwind,
I exf_inscal_vwind,
I vwindperiod, exf_inscal_vwind, vwindconst,
& exf_inscal_uwind, exf_inscal_vwind, exf_inscal_wspeed,
exf_inscal_vwind = 1. _d 0