3D preview of Open-Frame Fuselage with Wing Spars
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Interactive 3D model of Open-Frame Fuselage with Wing Spars

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Open-Frame Fuselage with Wing Spars

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Bounding box
252.3 × 270.0 × 139.5 mm
Engine
Precision B-rep
Parameters
35
Published
September 12, 2026

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The prompt

Modify the existing model. Keep the current open-frame structure. Make the fuselage widest through the middle wing-root area and slightly narrower at the front and rear. Flatten the underside further. Make the upper fuselage narrower than the lower fuselage. Replace the irregular internal braces with one straight main wing spar passing horizontally through the fuselage and one smaller rear spar behind it. Keep all formers aligned perpendicular to the fuselage centreline. Do not add outer skin.

Parameters

NameValueRange
Fuselage Length240 mm80 – 600
Max Width (wing root)180 mm40 – 400
Fuselage Height130 mm30 – 300
Flat Belly Width168 mm10 – 400
Upper Deck Width108 mm10 – 400
Belly Corner Chamfer6 mm0.5 – 30
Upper Corner Chamfer14 mm0.5 – 40
Max-Width Line Height-26 mm-140 – 60
Wing-Root Station0.42 ratio0.1 – 0.9
Nose Width Scale0.55 ratio0.15 – 1
Tail Width Scale0.48 ratio0.15 – 1
Former Count7 count2 – 20
Former Thickness5 mm1 – 20
Former Rim Width4 mm1 – 15
Stringer Size3.5 mm1 – 12
Stringers Around Section10 count1 – 24
Segments Along Length8 count1 – 20
Top Keel Width26 mm5 – 80
Top Keel Height10 mm2 – 40
Main Spar Thickness (X)8 mm2 – 40
Main Spar Height (Z)14 mm2 – 60
Main Spar Wing Stub45 mm0 – 200
Main Spar X Station100 mm0 – 600
Main Spar Z Height-10 mm-140 – 130
Rear Spar Thickness (X)6 mm2 – 40
Rear Spar Height (Z)9 mm2 – 60
Rear Spar Stub15 mm0 – 200
Rear Spar X Station172 mm0 – 600
Rear Spar Z Height8 mm-140 – 130
Engine Bay Diameter34 mm4 – 120
Engine Bay Offset (Y)42 mm0 – 200
Engine Bay Height (Z)-18 mm-140 – 130
Tail Pin Diameter5 mm1 – 20
Tail Pin Length12 mm1 – 60
Tail Pin Count3 count1 – 6

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

Open-Frame Fuselage with Wing Spars - Free CAD Model (STEP, STL) | TextoCAD