Micro Quadcopter 105mm 110mm FPV Scisky by Printbus

Last crawled date: 3 years ago

This is another variation of a 105mm or 110mm FPV quad for a Scisky v1.2 flight controller. The Micro 105 FPV Quadcopter - 8.5mm Motors, Micro Scisky by Punkkills and Micro 105-remix for HYPERION MINI FPV CAMERA by lpoc78 are declared as remix sources to provide credit to design influences. No digital source was actually used from either design. A heavily commented openSCAD source script is provided to enable user tailoring.
The baseline design leverages the following key components -
8.5mm x 20mm brushed motors (Racerstar, Sidewinder, etc.)
55 or 56mm props like those for Walkera QR Ladybird
FX797T or Hyperion MiniCam Camera and VTX All-In-One
Scisky v1.2 flight controller with DSMX receiver, updated to Cleanflight v1.14.2
Pololu U3V12F5 5v regulator for AIO power
Turnigy NanoTech 500mAh 1S battery
I used the DSM2/DSMX version of the Scisky v1.2 board that is commonly available. The Scisky v2.1 boards with STM32 F3 processors also fit. The v1.2 and v2.1 boards have two rows of pads and a single connector that are meant for use in a overskyrc VTX solution. Compatibility with the older style Scisky with UART and II2C connectors is unknown - the possible issue is whether there are components on the bottom side of the earlier boards that interfere with the board supports in the tray. The F3 version of the board, as well as variations with Devo, Futaba, Frysky, Flysky and Hubsan compatible receivers are available from http://www.overskyrc.com/.
There have been problems with the 5V regulator on the original Scisky boards handling the VTX load, so I used a standalone Pololu 5V regulator like many have. I've noticed the F3 version of the new Scisky is described at OverskyRC has having a 1-amp 5V output instead of 500mAh. Maybe the F3 boards have a new regulator design that reduces the need for the Pololu.
The frame design leverages three-dimensional sweeping arcs intended to provide a compromise between strength and weight. The Scisky flight controller mounts to a small tray that is vibration isolated from the frame using foam tape. The battery is strapped to a smaller plate that mounts above the frame.
The design is parameter driven. Component parameters allow the components to be previewed in their installed locations. A small test plate can be created for fit-checking hardware and the motors before printing a complete frame.
Various options are built into the openSCAD script. The provided STL includes options for the protective arc in front of the AIO, rubber band mounts for use with the AIO, and provision for a rollbar fabricated from 1/8-inch polycarbonate rod. Precut rods are available at http://picnicquads.com/product/roll-bars/, or rods can be cut from item 2XPT9 rod at http://www.grainger.com. The provided STL has the AIO mounted at 7-degree angle, front-to-rear motor spacing of 80mm, side-to-side motor spacing of 76mm (110mm diagonal size).
The gallery photo shows the frame printed in Voltivo Excelfil Signal Orange PLA, which is a near-perfect color match to the orange QR Ladybird propellers. The three frame components for the provided STL weighed in at 11.3g, for a full AUW of 57.7g.
Those not wanting to bother with FPV can just not install the all-in-one and Pololu.
See the openSCAD script for more information. Introductory comments offer suggestions on how to proceed with tailoring.
For information on the frame evolution or information on a quad build using this frame, see the forum thread at http://intofpv.com/t-first-fpv-quad-build.