Question: The Walter HWK 109-509 powered the first piloted aircraft of any type to exceed how many MPH in level flight?
Sentence (from "Messerschmitt Me 163 Komet"): Over 300 aircraft were built, but the Komet proved ineffective in its dedicated role as an interceptor aircraft and was responsible for the destruction of only about nine to eighteen Allied aircraft against ten losses.
Relevant evidence: No