Wonder if it was the port engine.
This was damaged before the aircraft was 'stolen' from Farnborough by BBMF
; the undercarriage indicated 'unsafe' when the aircraft was lined up for takeoff so the crew started to shut down and evacuate but the port prop was still turning when the port main gear leg collapsed, allowing the prop to strike the runway while still turning. Must have shock loaded the engine as the prop broke off at the reduction gear and bounced up, hitting the fuselage smack in the middle of the forward escape hatch!
I didn't witness the incident but as I was rostered as afternoon tower controller, I naturally had to go and 'inspect the runway' to see what damage had been caused to it