fix https://trello.com/c/NazB9P4w/75-change-windmill-blade-type-by-blade
fix https://trello.com/c/NazB9P4w/75-change-windmill-blade-type-by-blade

Flexible-User-Experience/fibervent,Flexible-User-Experience/fibervent,Flexible-User-Experience/fibervent,Flexible-User-Experience/fibervent,Flexible-User-Experience/fibervent