Wow! Sounds like one heck of a flight! Don't forget the lock-tite when you put the muffler back on your Magnum .15 engine.
Sounds like you had fun in spite of the "slings and arrows of outrageous fortune" reigning down on you at the field. Hopefully the Dragonfly will take off quickly enough once the muffler is reattached so that ground handling won't be an issue.