Gears and transmission
F-4 Phantom Scale Centre Fuselage Skeleton
- Bounding box
- 143.0 × 160.0 × 75.5 mm
- Engine
- Precision B-rep
- Parameters
- 26
- Published
- September 12, 2026
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Free to download and use. See the terms.
The prompt
Create a 3D-printable exposed centre fuselage section for a 1:38 scale F-4 Phantom II. Dimensions: * Length 135 mm * Width about 90 mm * Height about 75 mm Build it as an open aircraft skeleton, not a solid shell. Include: * 5 transverse fuselage formers * Formers 2 mm thick with 3 mm structural rims * 8 longitudinal stringers, 2.5 mm square * 1 upper central spine, 4 mm × 3 mm * Main wing spar through the fuselage, 4 mm × 8 mm, extending 35 mm each side * Rear wing spar, 3 mm × 6 mm, extending 25 mm each side * Two internal longitudinal openings about 24 mm diameter for future J79 engine models * Three 4 mm locating pins on the rear face for joining another fuselage section Keep the whole structure hollow and open. Do not add outer skin, wings, cockpit, engines, landing gear or weapons. Make all geometry suitable for FDM printing with a 0.4 mm nozzle, with minimum thickness about 1.8 mm. Export-ready for STL or STEP.
Parameters
| Name | Value | Range |
|---|---|---|
| Length | 135 mm | 80 – 200 |
| Width | 90 mm | 60 – 150 |
| Height | 75 mm | 50 – 130 |
| Former Count | 5 | 3 – 8 |
| Former Thickness | 2 mm | 1.8 – 4 |
| Structural Rim Width | 3 mm | 2 – 5 |
| Stringer Size | 2.5 mm | 2 – 5 |
| Stringer Count | 8 | 4 – 12 |
| Spine Width | 4 mm | 2 – 8 |
| Spine Height | 3 mm | 2 – 6 |
| Main Spar Width | 4 mm | 2 – 10 |
| Main Spar Height | 8 mm | 4 – 15 |
| Main Spar Extension | 35 mm | 10 – 60 |
| Main Spar X Position | 65 mm | 30 – 100 |
| Main Spar Z Position | 2 mm | -10 – 15 |
| Rear Spar Width | 3 mm | 2 – 8 |
| Rear Spar Height | 6 mm | 4 – 12 |
| Rear Spar Extension | 25 mm | 5 – 50 |
| Rear Spar X Position | 110 mm | 70 – 130 |
| Rear Spar Z Position | 2 mm | -10 – 15 |
| Engine Opening Diameter | 24 mm | 10 – 40 |
| Engine Opening Y Offset | 22 mm | 5 – 35 |
| Engine Opening Z Offset | -15 mm | -25 – 5 |
| Locating Pin Diameter | 4 mm | 2 – 6 |
| Locating Pin Length | 8 mm | 4 – 15 |
| Locating Pin Count | 3 | 3 – 3 |
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.
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