I will never forget watching the first test flight of a Puchaz (glass fibre two seat glider) after a rebuild following a crash when the fuselage had broken in two aft of the cockpit. The guy flying it was on the radio and was struggling to stay behind the tug using all his energy to push the stick forward. It transpired that the elevator trim cable crossed over on its way to the back and had been rebuilt straight. The chap flying it got away with it - I do remember the tug flying alongside him and over the radio to a load of instructors on the ground saying "Your trim tab is fully down" and not one of us instructors realising that it should have been UP (with the trimmer fully forward). We worked it out after he'd landed!
