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| Source | Valid From | Winds (KT) | Clouds | Visibility (SM) | Temp/Dew | Altimeter |
|---|---|---|---|---|---|---|
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|---|---|---|---|
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Upper Winds
| Location | Valid Time | 3000' | 6000' | 9000' | 12000' | 18000' | 24000' | 30000' | 34000' | 39000' |
|---|---|---|---|---|---|---|---|---|---|---|
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Pacific Flying Club
Calculations Worksheet
Takeoff Calculations Worksheet
Field Data and Conditions
/
kts
Note: If From TAF / METAR ect. Convert to Magnetic
Calculate Wind Components
Runway Magnetic Heading:
070°M
Wind Angle off Runway:
20°
Head wind
9.4
Kts
Cross Wind
3.4
Kts
Calculate Wind Factor
Head Wind
9.4 Kts
Divided by 9 =
1.04
X 10 =
10.4 % Headwind Factor
Tail Wind
0.0 Kts
Divided by 2 =
0.00
X 10 =
0.0 % Tail Wind Factor
Calculate Pressure Altitude
Note: If result is below sea level use sea level pressure altitude.
29.92
-
Altimeter Setting
29.92
=
Note: May be Negative or Positive
0.00
X 1000 =
0
+
Field Elevation
10
=
Pressure Altitude
10
FT
Cessna Charts (POH Short Field)
From the Cessna Charts find the sets of distances that bracket the actual temperature and the actual pressure altitude. Temp 1 will be the low temperature and Temp 2 will be the high temperature. Pressure Altitude 1 will be the low pressure and Pressure Altitude 2 will be the high pressure. Note: if the temperature or pressure matches one in the charts you do not need to do an adjustment for that chart.
Temperature Factor Calculation
15
°C Actual Temp
-
10
°C Temp 1
=
5
°C X 10 =
50 %
Pressure Altitude Factor Calculation
10
Actual Pressure Altitude
-
0
Pressure Altitude 1
=
10
X 0.1 =
1.0 %
Temperature Adjustment
Cessna Chart Pressure Altitude 1 =
0
ft
| Ground Roll | Total To Clear 50 ft Obstacle | |
|---|---|---|
| Temp 2 Distances | 925 | 1685 |
| Temp 1 Distances | - 850 | - 1570 |
| Difference | = 75 | = 115 |
| Temperature Factor | X 50 % | X 50 % |
| Adjustment | = 37.5 | = 57.5 |
| Temp 1 Distances | + 850 | + 1570 |
| Temperature Adjusted Distances | A1 = 887.5 | A2 = 1627.5 |
Chart Pressure Altitude 2 =
1000
ft
| Ground Roll | Total To Clear 50 ft Obstacle | |
|---|---|---|
| Temp 2 Distances | 1015 | 1860 |
| Temp 1 Distances | - 940 | - 1725 |
| Difference | = 75 | = 135 |
| Temperature Factor | X 50 % | X 50 % |
| Adjustment | = 37.5 | = 67.5 |
| Temp 1 Distances | + 940 | + 1725 |
| Temperature Adjusted Distances | B1 = 977.5 | B2 = 1792.5 |
Pressure Altitude and Wind Adjustment
| Ground Roll | Total To Clear 50 ft | |
|---|---|---|
| Temp Adjusted Distances (B) | B1 = 977.5 | B2 = 1792.5 |
| Temp Adjusted Distances (A) | - A1 = 887.5 | - A2 = 1627.5 |
| Deference | = 90.0 | = 165.0 |
| Pressure Alt. Factor | X 1.0 % | X 1.0 % |
| Adjustment | = 0.9 | = 1.7 |
| Temp Adjusted Distances | + A1 = 887.5 | + A2 = 1627.5 |
| Adjusted Distances | = 888.4 | = 1629.2 |
| Subtract Headwind Factor | - 10.4 % | - 10.4 % |
| Final Paved Distance | = 796 FT | = 1460 FT |
Caution: Add Tailwind Factor - Max 50%
Grass Runway Adjustment
Takeoff X 15%
Ground Roll Distance
796
X Grass Factor
X 15 %
Grass Adjustment =
119
| Ground Roll Distance | 796 |
| + Grass Adjustment | + 119 |
| Final Ground Roll Distance | = 915 FT |
| Total To Clear 50 Feet | 1460 |
| + Grass Adjustment | + 119 |
| Final Total to Clear 50 ft | = 1579 FT |