Betaflight 3.1.7 F3 Tricopter setup Tips! - RC Groups
Thread Tools
Jun 28, 2017, 04:00 AM
Registered User
Bking1340's Avatar
Discussion

Betaflight 3.1.7 F3 Tricopter setup Tips!


Good day all

Just want to share my setup, especially on the yaw servo using a F3 flight controller (X-Racer F303)on betaflight 3.1.7. Got some help from waltr on the betaflight group. Maybe this will help someone. waltr added some of these info to the wiki: https://github.com/betaflight/betafl...O_TILT-for-3.1

When I 1st started out on multirotors about 9-10 years ago, multirotors were still in their baby steps - coming from heli`s, it was a great experience, but also difficult to do setups on the old (1st)kk boards, multiwii boards using arduino to change and compile firmware - glad that`s history. FPV what is that?
So multirotor frames were like chicken teeth - not a variety - so sometimes you had to build your own frames using aluminum or wood and used these stupid old airplane motors where you had to use a prop adapter that will pop off mid flight.
After a few quads and hexes, I saw a guy flying a tricopter I build one and it was great - the yaw almost fell like flying a heli.
Okay - back to the present - bought a trifecta when they came out and used a cc3d with openpilot. But used it for maybe 5 flights, because I like my quad fpv scene.
Last week I thought to dust off my tri and use a f3 board that was laying around collecting dust.

Setup: Tri are in front of you with 2 front motors facing forward and rear motor / servo facing you
Motor 1 - rear to motor pin 1
Motor 2 right to motor pin 2
Motor 3 left to motor pin 3

I don`t think it`s a good idea to draw power from the board with a servo (especially on a tricopter), so my red(positive) , black (negative) are going to a pdb 5v output, The yellow or white wire(signal wire) can be connected to motor pin 7 or 8 (I used 8) - other pins will have timer conflicts.

Do your initial setup in betaflight (choose tricopter in configuration tab etc). Go to CLI
If you type resource, you will see that motor 8 and Serial_Rx 2 are on A03.
Type:
Resource motor 8 None
Resource Serial_Rx 2 None
Resource servo 1 A03
Save

Now your servo is supposed to work, do not matter if the tri are armed or not. IF you want to disable the servo when it`s not armed, go to cli and type:
set tri_unarmed_servo = OFF .
save
I did not do this.

Now check if your servo/motor are tilting in the correct direction. If you move your yaw stick to the left, the motor must tilt to the right. If not, there are 2 ways to fix this.
In cli type:
set yaw_control_direction = -1
save
Or you can just reverse the yaw direction on your tx.

Now check if your servo/motor are compensating in the correct direction. If you quickly move your tail to the right (So nose will tilt left), the motor must tilt quickly to the left.

I removed my analog servo and replaced it with a digital one - my directions were reversed with the digital servo.
Go to betaflight servos tab - Something strange for me was that I thought my servo was set to servo 1 in cli and it will be servo 0 in the servos tab, but this was not true, mine are servo 5 in the servos tab.
I just changed "Direction and rate" from +100% to -100%
Here you can also get your rear motor exactly horizontal with "Mid" and set your endpoints of your servo with "Min" and "Max".
I think you can also reduce your endpoints with "Direction and rate", but not 100% sure.
Also check your digital servo specs and change the pwn rate in cli
Stock is 50 (for a analog servo)
I changed mine to:
set servo_pwm_rate = 250
save

My yaw gains are basically stock - only increased I with 10 clicks.

I can`t comment on triflight, because I have not use it, but saw a setup video and it also seems great.
Will try it in the following week or 2

I am going to mount a spotlight in front and some led`s on the arms to use this tri as a casual fpv slow night flyer.

I hope this will help some of you.
Last edited by Bking1340; Jun 28, 2017 at 05:15 AM.
Sign up now
to remove ads between posts
Jun 28, 2017, 01:16 PM
Registered User
LitterBug's Avatar
Have you tried TriFlight0.7 which is being rebased off of BetaFlight?

Cheers!
LitterBug
Jun 30, 2017, 07:48 AM
Registered User
Awesome tip!
Sep 07, 2017, 02:19 PM
Registered User
Hi, thanks for the great post. I'd like to build a tri with the BetaFlight F3 fc and RcExplorer's Baby TriCopter kit, which uses a servo with feedback. Any thoughts on wiring up such a craft?
Sep 09, 2017, 08:05 AM
3Dog Modeling
Switchblade2k's Avatar
Quote:
Originally Posted by dubadub425
Hi, thanks for the great post. I'd like to build a tri with the BetaFlight F3 fc and RcExplorer's Baby TriCopter kit, which uses a servo with feedback. Any thoughts on wiring up such a craft?
David has a step by step video on how to do this on the RC Explorer site(its a YouTube video)...they have a custom made F3 FC made for the Baby Tri but its no different really if you use an off the shelf.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product Betaflight 3.1 F3 6DOF Mini Flight Controller 20x20mm /w OSD + 5V BEC nitbeat Micro Multirotor Drones 154 Oct 07, 2017 04:28 AM
Help! Omibus F4 FC with Betaflight 3.1.7 Blank OSD HavingFun2002 Multirotor Drone Electronics 3 Jun 16, 2017 03:24 AM
Question Can't get rid of oscillations in horizon mode? Betaflight 3.1.7, SP F3 DarkinFlux Multirotor Drone Electronics 5 May 21, 2017 05:49 AM
Question Betaflight 3.1.7 on SP F3 not working with 2khz gyro rate? DarkinFlux Multirotor Drone Electronics 0 May 16, 2017 08:33 AM
Discussion Betaflight 3.1.7 Issue with gyro calibration Rjohndraws Multirotor Drone Talk 1 Apr 20, 2017 11:17 AM