# Fuselage Geometry Calculations

This page does a number of computations associated with seating and fuselage geometry.

 Number of Seats: Seat Pitch: Seat Width: Aisle Width: Nose Fineness: Tailcone Fineness: Main Deck Seat Layout: Upper Deck Seat Layout: Height / Width: Extra Forward Space: Extra Aft Space: Floor Height:
 Fuselage Height: Fuselage Width: Fuselage Length: Wetted Area: # of Seat Rows: Wall Thickness: Nose Length: Cabin Length: Tailcone Length: Tailcone Height:

• Number of Seats is the total number of seats to be arranged as described in the airplane. The current program does not differentiate between first class and economy seating, so if you plan to describe an airplane with dual or tri-class seating, you should enter the actual number of seats and an effective seat pitch that is an average of the overall seat layout.

• Seat Pitch: Longitudinal distance from one seat to the corresponding point on the next seat. (i.e. the seat spacing from back of one row to the back of the next row, measured in inches).

• Seat Width: The width of the seat including armrests associated with that seat (inches).

• Aisle Width: The width of the aisle in inches.

• Nose Fineness: Ratio of nose length to fuselage maximum width. The nose length is taken to be the distance from the front of the airplane to the start of the constant section (or tail cone if there is no constant section)

• Tailcone Fineness: Ratio of tail cone length to fuselage maximum width. The tail cone length is taken to be the distance from the back of the airplane to the start of the constant section (or nose section if there is no constant section)

• Main Deck Seat Layout: Distribution of seats and aisles written as an integer. 32 means 3 seats together, then an aisle, then 2 seats. 353 means a twin aisle airplane with 3 seats then an aisle, then 5 seats in the center, then another aisle, then another 3 seats.

• Upper Deck Seat Layout: On airplanes with an upper deck the seat layout as described above. If the airplane has a single deck, enter 0. At the moment the cross-section is not drawn with an upper deck.

• Height / Width: The ratio of fuselage maximum height to width.

• Extra Forward Space: Extra space placed aft of the nose section and forward of the seats. This space may be used for lavatories, galleys, or closet space. Entering a negative value places seats in the tapering nose section, as one would do for a large airplane or SST.

• Extra Aft Space: Extra space placed aft of the seats and forward of the tail cone. This space may be used for lavatories, galleys, or closet space. Entering a negative value places seats in the tapering tail cone section, as one would do for a large airplane or SST.

• Floor Height: The vertical offset of the floor from the center of the cabin in units of cabin height. A value of 0 places the floor at the fuselage centerline, while a value of 0.5 would place the floor at the lowest point on the fuselage. Typical value: 0.15.