Involute Blower

It becomes harder and harder to blow my birthday candles, here comes the hand cranked blower !
If you want to see me in training :
http://vimeo.com/73108405
4 shapes for the blades: straight, involute, forward and backward.
1 crank turn gives a bit more than 36 fan turns with default settings.
 
September, 8 2013
http://vimeo.com/74023928