Motorcycle Gas Tank
This tutorial was done quite a long time ago. It is a fairly simple construction.
Maybe today I would model it differently, but it's pretty instructive just like this.
You can downloada the 3D file here:
Motorcycle Gas Tank
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Step 1: Preliminary Sketches...
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Step 2: Planes we need...
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Step 3: Main Sketch...
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Step 4: Auxliliary Surface...
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Step 5: Cross Section Profiles...
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Step 6: First Loft ...
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Step 7: Sk for Splitting...
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Step 8: Split Line...
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Step 9: More Planes we need...
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Step 10: Guide Sketch...
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Step 11: Another Guide Sk...
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Step 12: Lofting the Ends...
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Step 13: Knit & Mirroring the Surface
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Step 14: Guide Sketch for Middle Channel
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Step 15: Plane Perpendicular...
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Step 16: Sk for Cross Section of Channel...
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Step 17: Cutting the Tank...
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Step 18: 10mm (~3/8") Radius...
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Step 19: Base Plane for Cap and Tube...
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Step 20: Extruding Tube & Cap...
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Step 21: Knotching the Cap...
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Step 22: Lettering...
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Step 23: Finishing...
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Step 24: Rendering...
It looks nice!