Pilot math

計數係惡夢 但方法還是有 🤭

Ref skybrary:

https://skybrary.aero/articles/rules-thumb

時間 Time

6 mins 0.1 hour

3 mins 0.05 hour

方位

Reciprocal Heading

= HDG +200 – 20

or

= HDG – 200 + 20

大過200就- 先 ； 細過200就+ 先

e.g 090 : 90 + 200 – 20 = 270

270 : 270 – 200 + 20 = 090

溫度

F = (9/5)C + 32

Standard Temperature lapse rate

Every 1000 feet decrease 2 C , up to 38000 feet MSL

ISA Temp

15 – (feet / 1000)* 2

Temperature deviation = Actual – ISA temp

e.g OAT = 20 C @ 5000 feet , calc Temp Deviation

ISA Temp @ 5000 feet MSL = 15- (5000/1000 )* 2 = 15 – 10 = 5

Temp Dev = Actual – ISA = 20 – 5 = + 15 C