GRUMMAN AMERICAN
FOR TRAINING USE ONLY – SECTION 5
MODEL GA‐7/COUGAR
PERFORMANCE
5‐5
Issued: April 10, 1978
A correction for the effect of wind may be based on Note 1 of the takeoff distance chart (Figure 5‐6). From Figure
5‐5, the headwind component is determined to be 9.8 knots.
9.8 𝑘𝑛𝑜𝑡𝑠
5 𝑘𝑛𝑜𝑡𝑠
𝑥 4%
8% 𝑑𝑒𝑐𝑟𝑒𝑎𝑠𝑒
This results in the following distance, corrected for wind:
Ground roll, zero wind
1237 Ft.
Decrease in ground roll (1237 x 8%)
99 Ft.
Corrected ground roll
1138 Ft.
Total distance to clear a 50‐foot obstacle, zero wind
2272 Ft.
Decrease in total distance (2272 x 8%)
182 Ft.
Corrected total distance to clear a 50‐foot obstacle
2090 Ft.
The distance is well within the takeoff distance available of 5500 feet.
TIME, FUEL, AND DISTANCE TO CLIMB
Enter the graph for Time‐Fuel‐Distance to Climb (Cruise Climb) (Figure 5‐12) at the initial altitude (546 feet), OAT
(29°C) and weight (3750 pounds). Also enter at the cruise altitude (8500 feet), OAT (10°C) and weight (3750
pounds).
Time to Climb
13.4 ‐ .8 = 12.6 Minutes (.21 Hours)
Fuel to Climb
4.8 ‐ .4 = 4.4 Gallons
Distance to Climb
24 – 1.2 = 22.8 N.M.
TIME, FUEL, AND DISTANCE TO DESCEND
Enter the graph for Time‐Fuel‐Distance to Descend (Figure 5‐18) at the cruise altitude (8500 feet) and at the final
altitude (3605 feet).
Time to Descend
17 ‐ 7 = 10 Minutes (.17 Hours)
Fuel to Descend
5.2 – 2 = 3.2 Gallons
Distance Descend
46 – 19 = 27 N.M.
CRUISE INFORMATION
Based on the distance required, cruise performance tables (Figure 5‐14), and the range and endurance profiles
(Figures 5‐16 and 5‐17), a cruise power setting of approximately 65% using 2600 RPM at 8500 feet has been
selected.
Entering the cruise performance tables at 8000 feet, 10,000 feet, standard temperature and 20°C above standard
temperature, the following table results.
