my mom bought me a used H7 PBS version for my Bday 2 years ago, it was the BEST birthday present EVER... at that time...
went down to the LHS and bought everything needed to run it, fuel, plugs, igniter, tools, etc. never once did they mention anything about a failsafe
needless to say, I found an open field with power lines runing accros it, my first tank of fuel and I had a big @$$ smile on my face, then horror struck when I tryed to stop

I had my mom in tears when I came in with 2 seporate buggys
the only thing I have left of the buggy is the front inner hingpin. that is my "good" luck charm
its a 5mm pin