Tricopter (Snap-in Arms)

Locking/ Snap-in Arm Tricopter Body
"Works like a charm!!" -- "No more loose, friction-only design"
The tabbed feature allows the Tricopter arm to secure itself into place for flight, but upon crash or stowage, the tab is pushed up and allows the arm to swing back towards the tail boom.
Most designs only use friction from the nuts/ bolts...this design eliminates the issue of arms swinging back during flight, thereby preventing crashes.
https://www.youtube.com/watch?v=zq50qVzfYBE&feature=youtu.be
https://www.youtube.com/watch?v=6A_G6-O-3z4&list=UUgKmRsq6bAPxCgDedHjPlAw