05/31/2008. Remarks by Johan Visschedijk: "Two P-80A-1-LO were experimentally fitted with ramjets. S/n 44-85042 was fitted with a 20 in (51 cm) diameter Marquardt C20-85D ramjet on each wing tip while s/n 44-85214 used a pair of 30 in (76 cm) diameter Marquardt C30-10B. The ramjets were first used in flight on March 12, 1947 and on June 17, 1948 44-85214 flew briefly on ramjet power alone."