figure 1.27. Effect of Reymafds  Number on Section Ckacteristics of NACA 4412  RN  MILLION  -6.0  11  s  4  8  12  16 20  SECTION  ANGLE OF ATTACK  =o 1 DEGREES  -I-  RN -  1.5 MILLION  I  I  1-  -.5  0  .5  I.0  1.5  SECTION LIFT  COEFFICIENT  c.l 