•-14- 1000  r--\----+VARIATION OF  MINIMUM  LENGTH OF  TAKG’-OFF !?UN  WITH HeAVINESS  AND HEAD  WIND  .....  BOO  ~  FIGURE lY- ~  700  TAKf-Off  CHART  from Bureau o{ Aeronautics  ((  SERVICE  BULLETIN  No. 60  ~  600  0  I  ~  soo  ~  ~  400  ~  300  ~  zoo  100  s  /0  15  20  2S  30  3S  40  H£AD WIND$_{7 }$ KNOTS 