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Old 05-12-2022, 07:22 AM
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airdave airdave is offline
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I don't think there can be a specific calculation, since:

the number of concentric parts is determined by the designers.

More connections allow for a transition that better matches the original shape,
but less parts allows for easier construction and less seams.
So its a designer's choice.
Only limited by overall scale.

Also, aircraft fuselages are often not circular (tube cross-section).
And the central axis often changes position as it moves down the length of the fuselage 'tube'.

I don't see how there can be a consistent calculation or geometry to designing a fuselage.

Most fuselage designs just mimic the overall shape and dimensions, based on a three-angle process.
Most designers base the 3D design on a three-view set of plans.
Most designers rely on 3D software to do all the calculations
and extrapolate the individual parts based on the designers input (3 view plan) and designer's preferences (scale and number of parts).
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