The Yaw assembly is the most complex part in any tricopter. Our kit’s Yaw assembly uses precision ball-bearings and a custom manufactured, stainless steel axle. In combination, this assembly provides ZeroYawSlop and spins freely and easily. The video below shows that just blowing on the motor mount makes the motor mount spin for a long while. The assembly is sturdy and extremely precise. The kit comes with 2 ball-links and a 1″ 2-56 threaded rod to create a slop free push-rod from your servo arm to the control horn of the Yaw assembly.
The kit provides you complete flexibility on how you assemble your Tricopter. All the hard parts are done. Build examples below.
|Only 2 examples.||Slow Flyer for FPV||Acrobatic Flyer|
|Arm length (measuring just the wood)||15" to 17"||7" to 13"|
|Prop Size||10x4.5 or 10x4.7||10x4.5 or 10x4.7|
|Motor Mounting||Facing UP||Facing DOWN|
|FPV Gear||Video TX, Flight Cam, OSD, etc.||None|
|RC RX||EzUHF or other LRS||2.4GHz|
|Motors||NX-4008 620kv||AX-2213N 800kv
|ESC||Plush 18A||Plush 18A|
|Lipo||3300mah to 5000mah 4s||2200mah 3s|
|Total Thrust||1129g x 3 = 3387g||690g x 3 = 2070g (AX-2213N)
~850g x 3 = 2550g (DT-750)
We offer a number of different accessories. Find the accessories in the GetFPV store’s tricopter category.
I always get suspicious when I read marketing language for new plane or mutlicopter kits that tout “crash proof” or “indestructible”. Nothing in this world is indestructible. I want to give you some background for why I chose Delrin as the material for this kit. Good context for why Delrin is a great fit for this tricopter frame is to look at something else that is made from Delrin: Guitar Picks. Guitar Picks are thin pieces of Delrin that are hit against metal strings for hours on end, with force and without breaking.
Delrin is an extremely strong plastic of high quality. It is softer than fiberglass board, which is the main reason it holds up so well in crashes. Rather than breaking, it will give in a hard crash — just like a guitar pick that gives rather than break when slammed into metal strings. Only when I crashed our prototype into a granite park bench at full speed, which caused a sound as if that was my last flight with this Tri, a small piece of the servo mount cracked which was easily fixed. Delrin is not indestructible, but super super strong. It always amazes me how much abuse it can take. I crashed our prototype over 20 times, but the servo mount crack I described is the only damage (so far). After my encounter with the park bench which was a real crash that would have totaled any heli or plane, I pushed the arms back out, put a piece of tape on the cracked servo mount and was flying again.
For FPV, Delrin is a better choice over carbon-fiber as it does not interfere with your video signal, which carbon-fiber can. The FPV Zephyr wing or FPV EasyStar use fiberglass spars and not carbon-fiber spars for that same reason. Delrin is also a lot less expensive to source compared to carbon-fiber, which is the reason for the low price point of our kit.
First time tricopter builders will try to find the most technically advanced material that “looks the best” to make their booms. Carbon, aluminum, fiberglass are all options. Many commercial tricopter kits that do come with arms (ours does not!) come with either carbon fiber or aluminum booms. However, builders that have gone through a few tricopters in their time often realize that wood is one of the best boom choices. One of the key design principles of a tricopter (or any multi copter) is to prevent the flight controller board, and specifically the gyros located on that board to be exposed to the motor and prop vibrations that are traveling from the motors, through the booms, to the flight controller. No material does a better job at slowing down vibrations than wood. While not as strong as carbon or other man made materials, it is surprisingly resilient. It is also easily replaced after a hard crash that does break a boom. Cutting and drilling wood booms only takes a minute.
Lastly, wood is the most affordable boom choice. Even in the US where 10mm wood is hard to come by, you can order 36″ 10mm x 10mm poplar or basswood for $1.30 a piece plus shipping (that’ll make a couple of arms unless you go longer than 18″ per arm). While most RC plane builders will look for basswood as it’s lighter than poplar, I don’t think it matters which you choose for a tricopter boom. Basswood feels a tiny bit more like balsa and poplar feels just a tiny bit harder and smoother. In a 10mm x 10mm boom, I think the flex is about the same, but poplar is stiffer and basswood said to be softer. The weight difference of a 36″ 10mm x 10mm piece is only about 4 grams (basswood being the lighter one), so only about 2 grams per boom or 6 grams total — insignificant for most builds. In terms of sourcing wood locally in the US, you can also go to your local lumber shop/yard and ask them to trimm a 1/2″ pine wood square down to 10mm. Just make sure they don’t give you a 3/8″ piece, which they tell you is the same as 10mm (but it is 9.5mm).
|3||Motors — many choices supported|
|2213N 800Kv Brushless Motor||HobbyKing||$9.34|
|DT-750 750kv Brushless||HobbyKing||$11.60|
|Outrunner with 16x19mm M3 threads like the Tiger Motors MT-2212-16 750KV||ClubHelis||$35.99|
|3||Propellors — for best performance, get 2 CCW (regular) and 1 CW (pusher) props|
|3||10mm arms (we recommend wood). If you can't find 10mm, many users have used 3/8" (9.5mm) instead and made it work.||Hardware Store for wood. In the USA, try Magnum Wood||$1.30 for a 36" piece|
|3||18A Plush ESC||HobbyKing||$11.90|
|1||Flight Controller Board — There are many choices. Below are some examples.|
|HobyKing Quadcopter Board
(get the USB Loader to update the firmware as well)
|Multi Wii Copter (with auto level)||MultiWiiCopter.com||$159|
|3||Prop Mounts or Prop Savers|
Don't get the HobbyKing 10 pack. They don't fit well.
|HobbyKing (not confirmed the fit)
-- OR --
TowerHobbies. These are confirmed to fit GWS, Maxx, and APC.
|$1.49 - $2.59|
|HobbyKing Prop Adapter 3mm||HobbyKing||$1.99|
|E-Flite Prop Adapter 3mm||No longer recommended!||n/a|
|1||Micro Servo: The kit is now better sized to support standard Hitec Micro servos like the HS-85MG||Hitec||$31.00|
|1+||Lipo Batteries — 3s or 4s depending on motor choice|
|2200-2500mah 3s Lipo||A good, high C rating battery would be the 2200mah Nano-Tech||$23.87|
|3300mah 4s Lipo (for supported motors)||Turnigy 3300mah 30C||$29.90|
|1||RC RX of your choice|
|4||Servo extensions (length depends on your arm length). 3 for ESCs, one for Yaw Servo.|
|Lots!||4" Zip Ties||Hardware Store|
|9||Motor to ESC connectors: 3.5mm gold connectors||HobbyKing||$1.59|
|1-2 meter||16 or 18 gauge Silicon Power Cable||HobbyKing Black
|Strong velcro and velcro strip for battery, double sided tape for flight controller.|