If you are using a mouse, you actually can't assign a key for extending the flaps via the in-game control settings. So you have to do this "manually":
1. In the folder <drive>:\Users\<user>\AppData\Roaming\wargaming.net\World of Warplanes\input_mapping you will find the file "mouse_directional.XML".
2. Open it with the standard Windows text editor for example.
3. Between the coding lines </CMD_DEC_TARGET_FORCE> und <CMD_AUTOPILOT> insert the following coding lines:
<CMD_FLAPS_UP>
<FIRE_KEYS>
<FIRE_KEY>
<fireKeyName> KEY_E </fireKeyName>
<fireKeyDevice> 0 </fireKeyDevice>
</FIRE_KEY>
</FIRE_KEYS>
<fireAxisIndex> -1 </fireAxisIndex>
<fireAxisSign> 0 </fireAxisSign>
<fireAxisDevice> 0 </fireAxisDevice>
<isBase> 1 </isBase>
<switchingStyle> -1 </switchingStyle>
</CMD_FLAPS_UP>
4. Save and done.
Now the flaps can be extended again by the "E" key. You may use any other key, of course.
Note: The message "Flaps extended" is shown only once on the sreen when first pressing the key in a battle. Nevertheless it works after that, too. You can see it by watching the wings.
Edited by schokofuchs65, 18 October 2017 - 06:23 AM.