For engines mounted in nacelle pods, no additional drag increment is incurred: the nacelle drag is accounted for separately.
For engines mounted in a fuselage and exhausting in the rear, extra drag may be incurred.
Nozzle Type |
|
In nacelle pods |
0.00 |
Short convergent |
0.036 - 0.042 |
Blow-in door ejector |
0.025 - 0.035 |
Plug |
0.015 - 0.020 |
Fully variable ejector |
0.010 - 0.020 |
Iris |
0.010 - 0.020 |
Ramp |
0.010 |
Notes:
1. These data apply in the M = 0.8 - 0.95 range;
2. These data apply to nozzle pressure ratios of 2.5 to 3.0.