For my drone project, three flexible parts can improve greatly the resistance of the components to crashs. These parts need to be flexible, durable and light.
I have created them specifically for the drone carbon frame I have also designed

The first one is the vidéo antenna holder: in fact the video antenna is exposed to hard hit on it and a flexible support will prevent it to bend too much.

The second part is a protector for 4S LiPo batteries (1300mAh - 1500mAh)
Lithium batteries are very exposed to damages during crashes and they really don't like that.
If damaged, a lithium battery can start a fire, that's why a good protector is recommended.
The one I designed will be soft mat between the battery and the carbon frame

The third part are a holder for the radio receptor antennas (left and right)