We had a incident on a 2.2 mtr 540 Edge where the throtle servo broke loose ( Sure the spinner came loose) she was at WOT, Fortunately the pilot was experienced and did some tight banks to keep the speed down. the run way is very short. the plane was fitted with a Opto kill but she came down hard breaking the firewall. My own gass bird has throtle trim kill and ignition kill. Pays to be safe in this day and age..