Shows how far ahead of the "curve" the Granville brothers were. Delmar Benjamin wonderfully demonstrated that if pilots and runways had been equal to the task, the R1/R2 performed exactly as designed.
The original QED seemed fine in handling. Sadly, it's pilot met his fate from a misplaced rag near the engine intake. The airframe was minimally damaged and currently on display in Mexico.
Model Y won more races than the other GB's combined, IIRC. It crashed from fabric failure.
Delmar told me the Z was a "pussycat" to fly, one of his favorites.