Rules of thumb Flashcards
1
Q
Lift
A
1/2 rho V^2 C_L S = IAS C_L S
2
Q
Weight increase to TOD
A
10% weight increase = approx 20% TOD increase
3
Q
Key values of Sin and Cos
A
alpha 30 45 60
Sin .5 .71 .9
Cos .9 .71 .5
or 0 30 45 60 90
Sin √0/2 √1/2 √2/2 √3/2 √4/2
4
Q
ISA atmosphere
A
15º C at 0ft alt., QNH 1013.25
5
Q
hPa to ft
A
1 hPh = 27 ft difference in altitude
6
Q
temp. decrease with altitude
A
ca 2º/1000 ft
7
Q
fuel weight
A
ca. .72kg/l for Afgas benzine
ca. .84 kg/l Jett-1
