The main documentation for the project is contained in the README Markdown file at the GitHub repo, here is a direct link: GitHub README.md .
A version of the README is mirrored in the project files on this project page, direct link: Local Copy
Sections of the README are repeated below otherwise.
- As this is a totally 3D-printed airframe, the fully-finished vehicle is moderately heavy, which is a handicap, especially in the hovering mode of flight. As such, be gentle and cautious in adding any additional weight. For the recommended print settings with a 0.4mm nozzle, the airframe alone weights a bit over 300g, and the all-up-weight of the finished vehicle is between 700g and 800g.
- The parts used in this project are commonly available in the drone racing and R/C plane market(s). The only known limiting component is the DYS BE1806 motor, which is an older (~2015 era) motor with a diameter of 23mm and around 80W power. A standard 22xx- or 23xx-sized motor can be used on the tail, but the nacelle design was modeled specifically for the DYS BE1806-2300KV. A future revision may increase the nacelle size to be able to mount 22xx-sized motors. Another potentially limiting component is the GreatPlanes GPMQ3843 Threaded Ball-Link set.
- The aerodynamics and stability of the vehicle are still under analysis and subject to revision. The CFD poses/cases used for aerodynamics analysis are included for independent study.
- Most project files are prefixed with "MH5", as this is the 5th internal revision of the design of the MiniHawk VTOL. The "MH#" prefix is incidental and not to be confused with the MH airfoil series, of which the MH45 is used for this vehicle. Generally, "MiniHawk VTOL" is the correct name for this design and any revisions to be released.
- This vehicle was designed in Autodesk Inventor Professional 2019. While compiled STLs are provided, the Solid Model and Assembly files for this vehicle are withheld at the time of this writing; contact me for inquires on obtaining a copy or further development.
- The Rear Strakes are recent additions to the design to compensate for poor directional stability. The aircraft does not weathervane into the relative wind well without them, and may yet require even larger vertical stabilization surfaces, not unlike the early days of the F-117 stealth aircraft. Another late addition to the design is the Lid FPV Variant, which supports the Foxeer -Nano camera formfactor (15mm width) and has a 30.5mm grid for a video transmitter, such as the AKK Infinite DVR.
|Airfoil (Root and Tip)||MH45|
|Rotor Spacing||315mm Circle|
|Lipoly Battery||3s to 4s, 1300mAh|
|Motors (front)||DYS BE1806 2300kV or eqv.|
|Motor (rear)||22xx or 23xx ~2000kV|
|Servos||HS-65HB/MG or eqv.|
|Flight Controller (size)||30.50mm to 16.0mm Grid|
|Propellers (front)||5050 to ~5249|
|Propeller (rear)||6030 to ~5249
The vehicle is designed to hover with a nose-high attitude (positive Angle-of-Attack). The reason for this is so that as the nose is dropped to level, the thrust vector brings the vehicle to an initial forward drift. Having established a forward trajectory, the motors are tilted to the 50/50 intermediate point and the vehicle is allowed to accelerate. The motors are then dropped to full forward-flight position.