# Create custom model for SITL

**URL:** <https://discuss.px4.io/t/create-custom-model-for-sitl/6700>\
**Category:** Uncategorized\
**Created:** [May 23, 2018, 12:18pm UTC](https://discuss.px4.io/t/create-custom-model-for-sitl/6700 "2018-05-23T12:18:55Z")\
**Posts on this page:** 1\
**Showing post:** 11

<div class="post-metadata">

**Author:** ![Fatih\_Ozkan](https://discuss.px4.io/user_avatar/discuss.px4.io/fatih_ozkan/32/10828_2.png) [@Fatih\_Ozkan](https://discuss.px4.io/u/Fatih_Ozkan)\
**Post date:** [March 17, 2021, 9:47am UTC](https://discuss.px4.io/t/create-custom-model-for-sitl/6700/11 "2021-03-17T09:47:49Z")

</div>

I followed the instructions. Here is my issue:

```
INFO [px4] Calling startup script: /bin/sh etc/init.d-posix/rcS 0
Error: Unknown model my_vehicle (not found by name on /home/user/Desktop/File/PX4-Autopilot/build/px4_sitl_default/tmp/rootfs/etc/init.d-posix/airframes)
ERROR [px4] Startup script returned with return value: 256

```

I am new to these things but i checked the

> /home/user/Desktop/File/PX4-Autopilot/ROMFS/px4fmu\_common/init.d-posix/airframes

I can find the file which is instructions saying “4229\_my\_vehicle”

Can you help me about it ? Or are there any instructions for adding custom model(Couldn’t find properly) ?

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_[View the full topic](https://discuss.px4.io/t/create-custom-model-for-sitl/6700)._