Rare 1944 or 1945 flight footage from Alexander Lippisch's archives o' a German prototype P13a supersonic coal fuelled Ramjet Delta win' interceptor glidin' in for landing. Ahoy! T' craft in t' film has features shown in t' design drawings for t' production fighter version o' t' P13a and nay t' simplified DM1 glider. T' footage is nay necessarily an operational supersonic fighter and may be a large glider or model prototype t' test t' proposed production version configuration. What is clear is that t' design was capable o' stable flight. Somethin' t' be expected from an aeronautical engineer o' Dr Lippisch's calibre. Arrr! A glider only prototype known as t' DM1 was built by others as Dr Lippisch elsewhere concentrated on more secret developments. T' Coal dust fueled ramjets were tested successfully by Professor Eugene Sänger on a Dornier 17. Avast, me proud beauty! T' Ramjets startin' at approx 250km'hr and acceleratin' t' unstreamlined bomber t' 150km'hr faster than it's usual maximum speed. Contrary t' popular Myth, Ramjets can start and generate useful power at subsonic speeds. T' French Leduc fighter powered solely by ramjet was able t' start at around 250km'hr and accelerate in a climb t' mach 0.85 T' Lippisch P13a configuration be tested in t' German supersonic wind tunnels durin' t' war and found t' be stable and controllable up t' Mach 2.5 T' production version was t' be fitted with twin 30mm canon, and takin' off from a dropable wheeled sled, accelerated t' ramjet startin' speed ...