# Quadcopter does not takeoff

**URL:** <https://discuss.px4.io/t/quadcopter-does-not-takeoff/13621>\
**Category:** Flight Testing & Log Analysis\
**Created:** [October 30, 2019, 1:06pm UTC](https://discuss.px4.io/t/quadcopter-does-not-takeoff/13621 "2019-10-30T13:06:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![owner01](https://discuss.px4.io/letter_avatar_proxy/v4/letter/o/87869e/32.png) [@owner01](https://discuss.px4.io/u/owner01)\
**Post date:** [October 30, 2019, 1:06pm UTC](https://discuss.px4.io/t/quadcopter-does-not-takeoff/13621/1 "2019-10-30T13:06:04Z")

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Hi guys,

I am trying to make PX4 work with on my custom hardware as a project.  
The problem is that it does not seem to takeoff and that the motor output seems to determined by the MIS\_TAKEOFF\_ALT.  
See this log file with MIS\_TAKEOFF\_ALT 1.4: [https://logs.px4.io/plot\_app?log=8bc2a72b-3989-4a1d-8c7e-64df6e6f2c6c](https://logs.px4.io/plot_app?log=8bc2a72b-3989-4a1d-8c7e-64df6e6f2c6c)  
And this log file with MIS\_TAKEOFF\_ALT 2.0: [https://logs.px4.io/plot\_app?log=4e435525-05d1-4c5a-b0bb-f2227b9c2763](https://logs.px4.io/plot_app?log=4e435525-05d1-4c5a-b0bb-f2227b9c2763)  
When using the takeoff\_alt of 2.0 the quadcopter will not fully lift of yet, but is really close.  
Is my quadcopter to heavy? It weighs 2 kilogram but the motors should be able to produce 1 kg of thrust each.