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UAV design.

by buzz, published

UAV design. by buzz Feb 18, 2013

Description

experimental UAV design
( made using OpenVSP and OpenSCAD ) .

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Today I updated the parts.scad file with the latest one. If you downloaded it earlier ( all 6 of you , please re-download ) . this file now renders in openSCAD without throwing any errors. ( outer wing section/s were failing due to my use of a function called "tapered_cube" that was flawed ( non-manifold? ) . I replaed it with alternate scad code.
I have also provided a *photo* of the actual parts as-printed ( printed over the past month or so ) . the wings are in blue and the fuselage is in orange.

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License

UAV design. by buzz is licensed under the Creative Commons - Attribution license.

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Instructions

Open the buzz_moved_tail_roots_out_6.vsp file with OpenVSP ( free aircraft tool from NASA) if you want to make changes to basic overall architecture, and then re-export each of the aircraft "parts" as separate STL/s. This *will* screw with all the dimensions and relationships I have in openscad, so don't do it lightly. :-)
I exported the wings,fuse,horiz tail, and vert tail as 4 bits ( from .vsp -> .stl ) , the stls for these are provided here too ( as the parts.scad file needs them) . To make the fuselage mostly hollow, but have significant wall thickness, I also made a second .vsp file that represents just the "inside" of the fuselage, and use openscad to subtract that from the original. - "fuse_only_hollow.scad"
These STL file/s are all the raw components that I then imported into openscad, and apply a bunch of function/s on to create the final designed plane parts - see parts.scad for all the openscad goodness that is the "main design file". - this includes hole/s for carbon fibre spars in both wings and fuse, and structural bracing in wings, and separating the ailerons, etc.

Once this is done, the parts.scad file has a p=x; parameter which represents the "part number". Set it to a number betwen 1 and 30, and then re-render openscad, and it will render just a single individual part, which can then be exported as a .stl file. I have individual files 1.stl, 2,stl... etc, but they aren't really needed, you can make them yourself like I did.

Finally, to assist in making the parts all 3D printer friendly, I import all the 1.stl -> 32.stl into netfabb basic( as separate parts ) , and rotate them all to position them so they are in a reprap printable orientation ( ie a flat face down ) , and then export them again ( I called them 1r.stl ... 32r.stl ).... and these files can then move on to Slic3r as usual! To save you a little work, I have included the netfabb project file here too ( the .fabbproject file ) , and a screen capture of all the parts laid-out ready for printing.

Good luck!

Main wIng parts are designed to be printed hollow ( ie turn of infill in slic3r ) .
Fuselage and tail parts are designed to be printed at approx 10% infill .
AIlerons and moving tail surfaces are not printable - I can't be bothered, I will just use a bit of balsa for this.

More details:

The wings have outer-half has taper and washout and rounded ends.
the dihedral is a reasonable 4 degrees,
the airfoil profile is a NACA4412, which with it's nearly flat bottom, and good lift characteristics is easy to work with.
I'm deliberately trying to keep the overall design simple, so it's 3D printable ( in sections of course. )

Yes, most of hthis has now been 3D printed, and no it's not yet been flown.... gimme a chance! :-)

Comments

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buzz on Apr 5, 2013 said:

Today I updated the parts.scad file with the latest one. If you downloaded it earlier ( all 6 of you , please re-download ) . this file now renders in openSCAD without throwing any errors. ( outer wing section/s were failing due to my use of a function called "tapered_cube" that was flawed ( non-manifold? ) . I replaed it with alternate scad code.
I have also provided a *photo* of the actual parts as-printed ( printed over the past month or so ) . the wings are in blue and the fuselage is in orange.

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