# Change Altitude of Take-off mode

Source: https://forum.modalai.com/topic/68/change-altitude-of-take-off-mode
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2020-12-26 04:57:51 UTC by mr TOKI
Replies: 6 · Views: 1674

## mr TOKI · 2020-12-26 04:57:51 UTC

Hello !! I followed VOXL m500 instruction changed QGC to Position Mode . When I use takeoff mission but I can not change the Altitude  
of takeoff mission (I had changed to 0.5 m but the UAV still head up to 2.5m )
Please show me how to change the alt

## Reply by modaltb (ModalAI staff) · 2020-12-28 16:16:10 UTC

Hi @mr-TOKI ,

There's two modes being mentioned above, `position mode` and `mission`.

In mentioning `takeoff mission` altitude, are you setting up waypoints in QGC?  Normally the `mission` mode is used for outdoor flight scenarios, so when I see you wanting to set an altitude of 0.5m, I'm thinking you are trying to use `offboard` mode and have a program control the flight?

If that's the case, and fairly easy example of that is found here: 
   https://gitlab.com/voxl-public/voxl-docker-images/voxl-docker-mavsdk-cpp

**BUT** be careful disabling the default "figure 8 mode" in the `voxl-vision-px4.conf` file, which is enabled by default.  This will automatically have the m500 fly figure 8's `1.5m` above takeoff point, which is perhaps what you are experiencing?

For reference on the 'figure 8 mode' flag, see this line:
https://gitlab.com/voxl-public/modal-pipe-architecture/voxl-vision-px4/-/blob/master/config/voxl-vision-px4.conf#L6

Thanks!
Travis

## Reply by mr TOKI · 2020-12-29 04:21:52 UTC

oh I see thank you. And do you know how much weight that VOXL m500 drone can lift. Thank you !!!

## Reply by tb_temp · 2020-12-29 17:10:09 UTC

Hi @mr-TOKI ,

We've listed 1kg on the datasheet here: https://docs.modalai.com/voxl-m500-functional-description/

Thanks!
Travis

## Reply by stevedan · 2022-12-21 10:17:30 UTC

@modaltb How do we change this height when doing mavros control. It seems like it always goes to the default 2.5 m.

## Reply by Chad Sweet (ModalAI staff) · 2022-12-21 16:47:03 UTC

Using www.google.com to search "PX4 Takeoff Height", I found these [results](https://www.google.com/search?q=px4+takeoff+height&rlz=1C1CHBF_enUS945US945&oq=px4+takeoff+height)

The first result leads to PX4's takeoff parameters documentation, here: https://docs.px4.io/main/en/flight_modes/takeoff.html

It describes a parameter "MIS_TAKEOFF_ALT Target altitude during takeoff (default: 2.5m)" 

You could try working with the MIS_TAKEOFF_ALT parameter? Since its default is 2.5m it might be related to what you are looking for?

## Reply by stevedan · 2022-12-22 13:46:02 UTC

@Chad-Sweet said in [Change Altitude of Take\-off mode](/post/7607):
> MIS_TAKEOFF_ALT

I am able to set this value with the desired height. The issue is that why is it that the takeoff service height is ignored?