West German glider pilot who on April 25, 1972, set the world record for straight-line distance soaring (gliding) by flying 1,460.5 km (907.7 miles) from the Baltic Sea to the Spanish border near Biarritz, Fr., more than 274 km (170 miles) farther than the old record. Grosse, an enthusiastic glider pilot since his teens, was a Luftwaffe pilot during World War II.

Grosse's record-breaking glider, an AS W-12, weighed 324 kg (716 pounds) and had a wingspan of 18.95 m (62.2 feet) and a top speed of 220 km/h (137 miles per hour). On Jan. 4, 1981, he set a world record of 1,306.856 km (811.56 miles) for distance around a triangular course. Earlier, on Dec. 9, 1980, he set a world record for speed (133.242 km/h) over a 1,250-kilometre triangular course and, on Dec. 24, 1980, a record for speed (158.67 km/h) over a 300-kilometre triangular course. With H.H. Kohlmeier he also set multiplace records of 970.95 km (602.96 miles) for distance to a fixed point and return (Jan. 7, 1980), distance around a triangular course of 1,112.62 km (Dec. 12, 1979), speed over a 750-kilometre triangular course of 131.84 km/h (Jan. 14, 1980), and speed over a 1000-kilometre triangular course of 129.54 km/h (Dec. 12, 1979). All of these records were set at Alice Springs, Australia.