How about this:
DEUTCHES FORSCHUNGSINSTITUT FUR SEGELFLUG- DARMSTADT
A little-known chapter in high altitude reconnaissance aircraft began with the 1940 concept from Deutches Forschungsinstitut fur Segelflug (German sailplane company) of the DFS 228.
The 34.7-foot long, 57.6-foot wing spanned craft was intended to be towed like the sailplane it was to 33,000 feet where the 3,630 lb. thrust Walter rocket motor was lit. Using the boost, it would climb to between 75-83,000 feet and use the motor on and off to maintain altitude for about forty-five minutes. It would then commence a long glide during which infrared recon photos were to be taken. By the time 39,400 feet was reached, it would have traveled 465 miles. A further 185 miles would be covered back to the ground. Of course the use of thermals would increase these ranges. A speed of 565 MPH at sea level was envisioned.
The pilot compartment was temperature controlled with an electrical unit and pressurized. The whole compartment could be jettisoned if need be. At a pre-determined altitude the pilot seat would disconnect and the parachute would open.
The DFS 228 would have been flying shortly though its impact on the war would have been miniscule.
Though gliding trials were accomplished in 1944, no powered flight had been undertaken at the time of Germany's collapse. Ten were under construction at that time.
Since the only remaining DFS 228 was shipped the U.S. after the war you can draw your own conclusions on the later U-2.