Aerodynamic characteristics of three helicopter rotor airfoil section at reynold numbers from model scale to full at march number 0.35 to 0.90 
 / National Aeronautics and Space Administration 
 .- U.S.: National Aeronautics and Space Administration,  1980 
 .- 81p. 
<br/>NASA-L-13139 
<br><U>Copy Details:</u><br> Acc. No.: <b>A68667</b>, Full Call No.: ,   Item type:  Technical Report , Location: COMPACT STORAGE (BASEMENT), <br><b>------------------------- --------------------- ------ --------- ------- ------- --------- -------- </b><br>