Dual-motor tailsitters

[quote=“palm369, post:851, topic:15302”]
I think your motors are too close to each other.
[/quote] looks ok to me, TVTS right?

I will try Otto’s settings. I have just bought the servos you linked.

Can anybody tell me what Q_FRAME_TYPE = 2:V looks like - wing design and/or motor layout? I have searched all over the internet, but I can’t find the answer.

Q_FRAME_TYPE is the motor Layout you use for the VTOL motors. Like theses here: http://ardupilot.org/copter/docs/connect-escs-and-motors.html#motor-order-diagrams
AFAIK this parameter is irrelevant for Tailsitters.

It seems like this software has been built in a way that you need some “inside knowledge” to know all the details. I would think that every parameter that is showing would be relevant for the aircraft. Where can I read what parameters that matter for a dualrotor tailsitter with vectored yaw?

If you read all the links, posted by Tridge in post 1, you are also an insider.
Yes you are right, the infos are spread all over the thread.
And parameter which are not or no longer used, parameters which are not explained, and parameters for developers only. It is a Research project not a kit for ready to fly. But you will learn a lot by doing as I did. :wink:
See here: https://www.youtube.com/channel/UCeY_PBnw4JTeXcyFIekcLtw/videos?view_as=subscriber

For the tilt servos you need 180 (+90/-90)
I use these here:
https://www.hoelleinshop.com/Sender-Servos-etc-/Servos/Servo-HS-5070-MH-Hochvolt-Miniservo-Metallgetriebe-Multiplex-HiTEC-113070.htm?shop=hoellein&SessionId=&a=article&ProdNr=M113070&t=182&c=187&p=187
And you will need the progarmming tool to modify to 180 degrees.

For the elevons they are good.

The servos I linked can do 150° from 700us to 2300us. Maybe even more. They have no mechanical limit. 150° is enough for TVBS you only need small angles while flying anyway. With these you can still tilt motors down to -60° when your same time able to tilt them up to +90° :wink:

Hi, I found Hyperion HP- DS16-FMD servos work great for me and the emitter servo program tool as well if you can find one …https://hyperion-world.com/en/radio-servo/airplane-copters/heavy-duty-hv-servos

https://hyperion-world.com/en/radio-servo/airplane-copters/heavy-duty-hv-servos

Hi,
currently i’m building a tailsitter. (with Apm 2.8, 2 Motors and 2 Flaps) My problem is that i can’t find any parameters with a Q_ at the beginning. Not even the Q_ENABLE paramter. Is there something i overlocked? I would be very thankful if anyone knows why i cant find those parameters. I have added a picture in which you can see that there are no parameters beginning with a Q. Btw. i’m new here and hope that i asked in the right category. I’m sorry if that’s not the case.

Greetings
Mathis

APM 2.8 is not supported since long time ago, so ur ending up old software. You need to get a newer FCU like PixHawk, Pixracer, PixFalcon etc

OK thank you. I have just figured it out an hour ago or so. But nevertheless thank you a lot.

UPDATE: Tridge fixed the transition in AUTO mode: Plane 3.8.4 released

Thanks Tridge!

3 Likes

Hello, I have built a non-vectored tailsitter wing. running pixhawk/gps V3.8.4 with a DX8 all Q_parameters are Enable.

My problem is it works fine in manual/FBWA mode but when I switch to QSTABILIZE I have no throttle input from the TX or FC

I am not sure if it needs GPS to work in QSTABILZE mode? I did have 6+ GPS
Param’s.param (16.1 KB)

Hi Andrew,

change ARMING_REQUIRE to 1

Rolf

Thanks Rolf, I gave that a go.

Now I am stuck on - PreArm:Check mag Field
I have run back through compass calibration and also accel calibration but Check mag field appears. I have obtain declination box check and I have also tried to use onboard and external compass

Offsets X 160 Y -219 Z -8
MOT X0 Y0 Z0

Hi Andrew02
sometimes I just run one compass at least to get it to arm while setting up ,I am interested in better solutions from pix experts as well

Also…FYI… STM flight controller… http://www.st.com/content/st_com/en/products/evaluation-tools/solution-evaluation-tools/sensor-solution-eval-boards/steval-fcu001v1.html#sw-tools

Anybody tried SITL with RF8 any the model of my tailsitter that Otto created?
I cant get it to hover at mid throttle in auto alt modes. Even in auto and RTL it will ascend when it wants to sink.

hello Andrew,
I had this message until I used the onboard calibration
http://ardupilot.org/plane/docs/common-compass-calibration-in-mission-planner.html

You may use only the external compass but I think this is not the problem as the message you will get with 2 compass and a bad calibration is ‘inconsistent compasses’

Also, check you compass orientation. With a pixhawk, the correct compass orientation is 'rotation_none’
Have a look at the following link to check your compass setup and calibration. This is very important.
http://ardupilot.org/copter/docs/common-compass-setup-advanced.html

As a general rule, it is better to install the compass and GPS as far as possible from electro magnetic sources including power module, battery, ESC, motor, RX with telemetry, 3DR radio…
Regards,
Pierre