For birth, death and burial see
http://www.volksbund.de/graebersuche...70D124DD6528FF
Gmelin had a lot of claims in 1943-1944:
18.07.43 Ltn. Knud Gmelin: HSS 15./KG 40 Sunderland £ 14 West/0555 13.14 Reference: CG MSS f. 211
26.07.43 Ltn. Knud Gmelin: HSS 13./KG 40 Wellington £ 24 West/1745 200 nm. N.W. Cap Ortegal 11.20 Reference: CG MSS f. 212
01.08.43 Ltn. Knud Gmelin 13./KG 40 shared £ 24 W/2733 360 km. S.W. Brest 15.52 Reference: CG MSS f. 212
02.09.43 Ltn. Knud Gmelin 13./KG 40 Liberator II £ 24 West S/1753: at 1.500 m. 09.39 Film C. 2031/II Anerk: Nr. –
18.09.43 Ltn. Gnud Gmelin 13./KG 40 shared £ 340 km. W.S.W. Cap Finisterre 12.07 Reference: CG MSS f. 217
29.11.43 Ltn. Knud Gmelin 1./ZG 1 shared £ 24 W/2834 N.W. Cap Ortegal 14.10 Reference: CG MSS f. 218
12.12.43 Ltn. Knud Gmelin 1./ZG 1 Beaufighter £ 14 West N/0818: 300 m. 14.09 Film C. 2031/II Anerk: Nr.3
11.04.44 Ltn. Kurd Gmelin 1./ZG 1 Mosquito £ 14 West N/3880: 700 m. [Biscay] 09.36 Film C. 2027/I Anerk: Nr.4
11.04.44 Ltn. Kurd Gmelin 1./ZG 1 Mosquito £ 14 West N/3880: 700 m. [Biscay] 09.40 Film C. 2027/I Anerk: Nr.6
Gmelin was killed on 9 June 1944. His Ju 88 was hit by AA fire over Normandy during an early morning mission against the Allied landing and he was wounded, but managed to reach German lines before crashlanding. His crew brought him out of the wreck but he died the same day in an hospital.