Open-Access of the MiniHawk-VTOL Nacelle Arms for modding and remixing

[StephenCarlson]

I've uploaded STEP artwork for both variants of the MiniHawk-VTOL Nacelle arm design, each variant in its most essential form for community modding. At the time of this writing, these STEP/STP files are located on the development branch in the stl-SourceFiles folder, see commit e0564c0 . Here is what the "essential" form looks like:

The long tail here omits the typical MiniHawk-VTOL wing that the nacelle is designed to attached to. This is to aid the VTOL community for using the MiniHawk's arm design on other R/C planes for turning them into VTOLs. Marc Appel has been instrumental in pioneering this on the Nano Drak and Heewing T1 and other aircraft, as documented on these Thingiverse links:
Mini Drak VTOL Conversion
Nano Drak VTOL
Heewing T1 Ranger VTOL remix

I hope that by offering the STEP version of the design, with the full loft/blend, the arm design can be adapted to any arbitrary wing or design. A few points to keep in mind if you want to use this:

• The Tilting Motor Mount and Nacelle are sized to hold a 2207- or 2306-size motor, or anything with a motor bell sized roughly 30mm in diameter.
• The motor mounting holes support 16mm to 19mm spacing.
• Two variants of the nacelle set are offered: One version which uses 3x6x2.5mm ball bearings supporting a 3mm shaft, and the other version just using a plain 1.8mm hinge pin.
• For the above measurements, if you want to scale the design up to support a larger motor, be aware that all the other features scale accordingly.
• This design has the motor tilted down 3.00 degrees when in the forward-flight position. Keep this in mind when adding this to your design, in case the motors need to be pitched up or down from this. The coordinate convention for the nacelles should have X-Forward, Y-Right, Z-Down. X/Y/Z offsets are inherited from my own CAD system and I couldn't remove or zero them. Also note that this is the LEFT nacelle and tilting motor mount. Mirror for the right version as needed.
• In whatever CAD system you use, simply position and rotate the arm to intersect with the model of the wing or structure that this will extend off of, and do a boolean removal, join and fillet as necessary to incorporate into your design.
• Be aware that you should keep the rotor disc as clean and free as possible: Don't have the nacelle so close to the wing leading edge that most of the thrust is blocked by the wing. Have the nacelle extend out as far as practicable.
• The motor wire duct will need to be expanded/extended for whatever your design does with the motors wires. The model offered here terminates at a 10mm diameter circular face.
• Please credit me (Steve Carlson) as the original designer when sharing or promoting this, but otherwise, have fun and remix away!