US 9,810,236 B2
Fan blade with flexible airfoil wing
Jonathan David Chelf, San Diego, CA (US)
Assigned to AIRSTREAM INTELLIGENCE, LLC, Solana Beach, CA (US)
Appl. No. 14/233,371
Filed by Jonathan David Chelf, San Diego, CA (US)
PCT Filed Jul. 19, 2012, PCT No. PCT/US2012/047477
§ 371(c)(1), (2), (4) Date Jan. 16, 2014,
PCT Pub. No. WO2013/013092, PCT Pub. Date Jan. 24, 2013.
Claims priority of provisional application 61/509,294, filed on Jul. 19, 2011.
Prior Publication US 2014/0154083 A1, Jun. 5, 2014
Int. Cl. F04D 29/38 (2006.01)
CPC F04D 29/382 (2013.01) [F05B 2240/311 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a flexible fan blade, the flexible fan blade comprising:
a curved, flexible wing having at least a lower portion, a leading edge, and an upper portion, the lower portion of the curved, flexible wing extending to the leading edge of the curved, flexible wing, the leading edge of the curved, flexible wing extending to the upper portion of the curved, flexible wing and the leading edge of the curved, flexible wing having a first radius of curvature in response to the curved, flexible wing being in a relaxed state and a second radius of curvature in response to the curved, flexible wing being in a deflected state, thereby creating a flexible airfoil of the flexible fan blade, the upper portion of the curved, flexible wing and the at least a lower portion of the curved, flexible wing forming an at least partially open channel adjacent the leading edge of the curved, flexible wing; and
a main spar disposed in the at least partially open channel, the main spar having at least a lower surface, the lower surface of the main spar connecting to the lower portion of the curved, flexible wing.