FAA搬訂的訓練教育手冊中詳細的提到,有關於Vx and Vy的差異性,~個人認為台灣輕航機的環境逐漸成熟,機型也越來越流線且快速,但反觀跑道的硬體設施並無相對的提升,例如跑道長度..下滑區的障礙物以及地面阻力等等..在這些尚未提升的硬底設施條件之下,如何能飛的安全,前陣子跟飛友聊天談到,原廠建議某機型起飛外型FLAP放一段,但是大家有沒有想過一個問題,起飛是飛行最危險的階段,在最大乘載的條件之下,你的希望是如何?如果是我.我會希望在最短的距離中讓飛機離地,留下越長的剩餘跑道越好, 這是對我的一種安全保障,因為國內大部分輕航機機場的跑道都不會太長,300m的距離,跟國外試飛所測試的數據是截然不同的條件,換言之 (你還會用一段FLAP起飛嗎)...換成是我絕對不會..為何? 因為環境使然...1:跑道長度不足2:地面大多數都是草地阻力系數過大 3:跑道頭清除區幾乎都有障礙物(如農園電線桿房舍等等)..我會最希望用最大的升力,來換取我的剩餘跑道,重言之這是環境使然,如果在國外有5000FT的跑道我會按原廠的數據起飛,這是非常不一樣的地方,gives the greatest altitude gain in the shortest horizontal distance.這就是我選擇的方式,起飛將FLAP全放,在最短的距離中獲得最大的升力.即可建立最大的起飛姿態.盡速爬升到安全高度~BEST ANGLE OF CLIMB—Best angle of climb
(VX) is performed at an airspeed that will produce the
most altitude gain in a given distance. Best angle-ofclimb
airspeed (VX) is considerably lower than best
rate of climb (VY), and is the airspeed where the most
excess thrust is available over that required for level
flight. The best angle of climb will result in a steeper
climb path, although the airplane will take longer to
reach the same altitude than it would at best rate of
climb. The best angle of climb, therefore, is used in
clearing obstacles after takeoff. [Figure 3-14]
It should be noted that, as altitude increases, the speed
for best angle of climb increases, and the speed for best
rate of climb decreases. The point at which these two
speeds meet is the absolute ceiling of the airplane.
A straight climb is entered by gently increasing pitch
attitude to a predetermined level using back-elevator
pressure, and simultaneously increasing engine power
to the climb power setting. Due to an increase in
downwash over the horizontal stabilizer as power is
applied, the airplane’s nose will tend to immediately
begin to rise of its own accord to an attitude higher thanthat at which it would stabilize. The pilot must be prepared
for this.

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