Check out today's awesome demo by Tridge. An ArduRover launches an ArduPlane! (Also note that the ArduPlane is flying beta ArduPlane software on the PX4 board. We're getting close to a dev release on that. Very exciting...)
[UPDATE] Tridge adds some details in the comments:
The SkyFun was in FBWA mode, with throttle off until after it lifted off the rover (the prop was resting on the APM on the rover, so zero throttle was important!). Both the rover and skyfun were running current APM git master. The SkyFun was using a PX4FMU board running the NuttX port of ArduPlane. Today was our first test flights of ArduPlane on the PX4, and it flew very well. Flight logs from today are here
The camera was being operated by our youngest club member Marias, who just got his MAAA gold wings today.
The reason we were doing this was to test the concept for possible use for launching our X8. We've found that hand launching the X8 with a heavy load on board is quite dubious, so we've mostly been using a bungee, but we thought a rover launch would be fun. Today was a test run with the SkyFun.
We've also built a catapult system for the X8 which we have yet to test.