Engine Power Exponent for Nacelle Weight According to Torenbeek Method

For General Aviation aircraft , the nacelle weight according to Torenbeek method is computed from:

..\Images\INFO1166_wmf.gif

where typical values for the factors are:

Engine Type

..\Images\INFO1167_wmf.gif

..\Images\INFO1168_wmf.gif

..\Images\INFO1169_wmf.gif

Single Engine

2.5

0.0

0.5

Multi Engines

Horizontally Opposed Piston Engines

0.320

0.0

1.00

Radial Piston Engines

0.045

-0.25

1.25

Turboprop Engines

0.140

0.0

1.00