Experimental Craft - DM-1 Glider

DM-1 Glider - Langley test of Aug. 1, 1946... Oddly, there are some reports of an object, disc or delta shape, with a fin projecting up from center or toward rear almost as tall as the object was long. So, there may have been wider range testing of this or another version that was recorded as a "UFO" in Project Blue Book pages.  It is accepted that some objects were mis-identifications, some were weather balloons (with or without any secret tst projects associated), some were mis-identifications of meteors, planets, and stars, and some were simple aircraft ( or not so simple early test projects such as U2 and others). These explanations do not, however, fulfill all the accounts of witnesses in numerous cases of craft performing as of yet unattainable speeds, maneuvers, and utilizing non regulation lighting for movement in air space. This craft was roughly 20 feet by 20 feet.  This craft led to other designs: Convair delta fighters such as XP-92, XF-92A, XFY, F2Y, F-102 and F-106 (Wikipedia).

Mitglieder der Akaflieg München - Akaflieg München e.V.

See the Project Blue Book file from 1 April 1952 on the subject of experimental craft (https://archive.org/details/1952-04-12428012-BLANK/mode/2up)