I had a RadJet ( there a pusher prop, so not really a EDF), they fly great, I had mine doing around 90mph. but most of the time I end up crashing landing it,,,
they don't glide or dead stick , you have to fly then into the ground...
I gave up on mine after a month..
Use Gorilla glue on your repairs it's lighter then epoxy..
As long as you've got foam,you can repair,, you'll know your self when a fuse has had it's day..
And when you do kill it just buy another fuse or a different ARF that takes all the part out of the old one
Sean