Hi SE5a:
I agree with Greg, initially in mid May
Jasta 10 was eqquipped early Fokker built Fok.D.VII machines. However, by August 1918,
Jagdgeschwader Nr.1 Richthofen was being re-equipped with Fok.D.VII with BMWIIIa engines in the Fok.D.VIIF4250/18 to 4299/18 serial number range. I feel quite sure that Oblt.
Erich Loewenhardt was flying one of these machines with yellow fuselage, tailplane, fin, wheel covers and struts when he collided with Ltn.Wentz on 10 August 1918.
Blue skies SE5a,
Dan-San