The supersonic windtunnels were used extensively in the German rocket and missile programs such as Wasserfall and the A4.
The Germans had built a number of devices capable of travelling more than 2800km'hr. The Windtunnel data allowing the Wasserfall to be able to maneuver at these extreme speeds.
The supersonic windtunnels were very useful for such developments but these programs themselves obviously had negligible impact on the war.
The Defensive wasserfall itself may have had a highly significant effect on the war if deployed in numbers against bomber formations and may have been far more effective than the Me163. The program was held back in favour of diverting resources to the A4 (V2) which appealed to Hitler's preference for offensive weapons and retaliation.
These devices had a significant impact on aerospace technology following the war.
Sänger who had designed the smaller of the ramjets shown above had windtunnel tested his silverbird hypersonic orbital skipper "Silverbird" which was intended to orbit the earth and drop bombs on any chosen target from space before returning from orbit. This project obviously did not get further development funding due to the enormous resources required but the performance of wings and controls were tested at high supersonic speeds.
Dr Sänger conducted tests of the powdered coal fuel at the DFS facilities
as did Dr Schwabl in Vienna (Vien)
Some details are mentioned in this Nasa publication from 1951 which states that Lippisch himself assisted further work on coal fueled ramjets for the US military.
http://ntrs.nasa.gov/archive/nasa/ca...1993086622.pdf
BTW, the windtunnel model of the P13 was tested at the supersonic windtunnel of the Aerodynamischen Versuchsanstalt in Göttingen in August 1944. It doesn't leave a lot of time to develop a full size working P13 by war's end if the Windkanal modell was being tested then but the Heinkel Salamander was developed in record time.
Lippisch had little to do with the finer details of construction of the DM1, which was largely being constructed by FFG München (Munich) facilities and at Prien on the Chiemsee.
Nice to hear T.A. Gardner you've come around on ramjets. A significant departure from the earlier statement "the rocket alone would have to boost the aircraft to near mach 2 (say 2000 kph minimum, and more like 2500 kph) just to get the ramjet to run."