Did the duo discus have a handy pop-up engine? they don't always get you out of trouble even if installed in the glider....One of the Jones lads was flying with a lady friend at Deeside, and getting nervous on the downwind leg raised up the standby handy engine.....which of course increased the drag nor did it choose to start..... and so though they might have made it to the runway, they ended up on a car in the car park, surprising an elderly couple sitting in their car watching the gliders.
As the expensive glider also suffered damage (though nobody hurt inside the car or the glider) rumour had it that the Jones lad had some serious explaining to do to his Dad, who owned the glider
When you really need it it doesn't always get you out of trouble!