I recently received permission to fly at a local recreation field for the weekends. Flight videos and a full write-up coming soon.
Fun fact: The frame alone, when constructed with generic 1/2 in. square wood dowel form the hardware store, weighs only 220 grams!
It’s alive! The tricopter went under a few more revisions and prints before finally taking to the air. My old Rev One Quadcopter has been reduced to it’s (over-engineered) frame and nothing more. Its parts (motors, ESCs, batteries, Crius AIO, etc.) have moved on to become this very tricopter.
Currently (in the picture) it is set up to fly FPV sans-GoPro. There is an optional part available to replace the camera pan/tilt servo mount/hole with an alternative “use-what-you-want” vibration-dampened plate.
Keep reading for a couple closeups and highlights of the tricopter.
The frame is now prototyped and measurements are almost final. Several small changes were made to the source files as result of this prototype (now on internal-revision #24). These changes included primarily wider tolerances and smaller hardware requirements. Other potential ideas are still pending (in particular; optional “taller” landing struts, ESC/wire management, and AIO mounting).
Changes to the last update included primarily, universal motormounts. Now it’s not necessary to use a specific cross plate on a limited range of motors. I’ve adopted the standard 16/19mm hole spacing used on many motors appropriate for this size multicopter. Also, the mount’s face is now flat on both sides, so you can more easily mod them (drill holes) for a specific motor that doesn’t follow these standards. With this, you will need to use 8mm M3 socket cap screws (instead of the shorter, countersunk M3 screws often provided with your motors) to mount said motors to the mounts.
The arms fold back too!
Continue reading Tricopter build log part two
The frame still needs to be prototyped on my printer, though I have modeled the finished project to get an idea of the size.
The distance between motor-centers is roughly 625mm when the two front 1/2″(12.7mm) wood dowels are cut to 350mm and the tail to 310mm (-40mm). This was necessary to accommodate the inline motor hinge that pivots on the axis of the tail arm. These dimensions, along with other things, are subject to change after the prototype gets printed.
I modified Thingiverse user ennui2342’s tricopter body, based off of David Windestål’s RCExplorer tricopter, to support the stronger, more common 1/2″ wood dowels. Other minor modifications to the body were made as well. I also loosely based my landing gear/motor mounts off of jphillips’ designs. The shock absorbing bottom plates (optional setups for FPV shown above) are unique to this tricopter.
After winning the Adafruit/Hack a Day Trinket contest I had to decide what to do with my new Trinket microcontroller. A few weeks went by before I came across this universal foot switch. With plenty of space inside it was just begging to be part of a new Trinket project. One thing led to another and then I realized that I am terrible when it comes to over-thinking the headings and greetings to my emails and other messages .
Thus came the Trinket Auto Greeter, or TAG for short; it types out a random greeting from a list at the push of a button. The code has been made available on the project page for anyone to use or edit.