# Vtol Configuration

**URL:** <https://discuss.px4.io/t/vtol-configuration/229>\
**Category:** PX4 Autopilot\
**Created:** [March 3, 2016, 1:38pm UTC](https://discuss.px4.io/t/vtol-configuration/229 "2016-03-03T13:38:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![WEIWEI\_CHENG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/w/53a042/32.png) [@WEIWEI\_CHENG](https://discuss.px4.io/u/WEIWEI_CHENG)\
**Post date:** [March 3, 2016, 1:38pm UTC](https://discuss.px4.io/t/vtol-configuration/229/1 "2016-03-03T13:38:31Z")

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Hi,

My name is Weiwei, im new developer on Px4. Im trying to create my first Vtol plane. At the first time it seems quite easy following step by step this tutorial [https://pixhawk.org/platforms/vtol/fun\_cub\_quad\_vtol](https://pixhawk.org/platforms/vtol/fun_cub_quad_vtol)

However, I have some issues with Multirrotor stabilization, I cannot takeoff because is very unstable. The behavior is not correct but i connect the pins correctly, as show on the website.

I see that it could be that the motors are working in + mode and not in x mode?

Please, I need help to continue =)

Thanks you

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**Author:** ![tumbili](https://discuss.px4.io/user_avatar/discuss.px4.io/tumbili/32/3779_2.png) [@tumbili](https://discuss.px4.io/u/tumbili)\
**Post date:** [March 5, 2016, 6:11pm UTC](https://discuss.px4.io/t/vtol-configuration/229/2 "2016-03-05T18:11:54Z")

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Which airframe configuration are you using? Also upload a log to [http://dash.oznet.ch/](http://dash.oznet.ch/)  
which will help us to understand your problem.

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**Author:** ![WEIWEI\_CHENG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/w/53a042/32.png) [@WEIWEI\_CHENG](https://discuss.px4.io/u/WEIWEI_CHENG)\
**Post date:** [March 10, 2016, 8:32am UTC](https://discuss.px4.io/t/vtol-configuration/229/3 "2016-03-10T08:32:13Z")

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Hi,  
I discovered what was the issue. The problem was the yaw stabilization.

I’m using PX4 with Funcub Vtol. I realised that the bad take off is due to the yaw orientation. I think that when I move the yaw in the RC transmitter, the copter move using the compass to make a good reference, but i’m note really sure about that.

I started fly my Funcub, but sometimes when I take off, the orientation is not correct, so 2 motors push more than other 2 trying to correct the orientation. I think that this issue is due to the Arm system, because it should use yaw on right position.

I will share with you the log as soon as possible.

I really appreciate your help, thanks!

WEIWEI CHENG

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<div class="post-metadata">

**Author:** ![WEIWEI\_CHENG](https://discuss.px4.io/letter_avatar_proxy/v4/letter/w/53a042/32.png) [@WEIWEI\_CHENG](https://discuss.px4.io/u/WEIWEI_CHENG)\
**Post date:** [March 10, 2016, 8:33pm UTC](https://discuss.px4.io/t/vtol-configuration/229/4 "2016-03-10T20:33:51Z")

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Hi,

He is the logs of the flight. And it seems something wrong with magnetic compass.

[http://logs.uaventure.com/view/yk684djPeR83QRVWDEPTaJ](http://logs.uaventure.com/view/yk684djPeR83QRVWDEPTaJ)