Total power loss during a test flight of my Lidl Twin fuselage RC build - But what caused it?

Bonzodog

Lidl Master
Another rc lesson flying my Twin Fuselage Lidl RC build the other day. In the days when I was flying nitro planes engine outs weren't uncommon, but you still had flight control. For my first time in 15 years, electric powered, I had a total power loss. Had it happened at height the model would have spiralled down a long way off and likely been lost. I was very lucky. But was the cause? A couple of new lessons for me.