As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF ROLL THE RT ENGINE STARTED TO BACKFIRE AND LOOSE POWER, AT 90 KTS THE TAKEOFF WAS ABORTED MIXTURES TO IDLE CUT OFF,THE LOAD WAS DUMPED. THE A/C WENT OFF THE END OF THE RUNWAY, AT 1000 FEET BEYOND THE RUNWAY THE A/C IMPACTED A DITCH. THE PILOT GOT OUT OF THE A/C AND WAITED FOR ASSISTANCE. THE A/C HAS BEEN DISMANTLED AND TRANSPORTED TO RED DEER,THE ENGINES ARE SCHEDULED FOR INVESTIGATION.