Increment in Aircraft Drag Coefficient due to Nozzle at Fuselage Rear

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

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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.