Willibert Mehlkopf described his 12-year-old bay gelding Cyrano as a "speed horse" after a victory Saturday night at the Washington International Horse Show. The description was justified again yesterday afternoon as Cyrano sped through the Capital Centre course in 35 seconds flat to win another speed class.

It was the second consecutive class that went to the West German team, which earlier in this week-long meeting of international-open jumpers seemed to be totally outclassed.

The United States Equestrian Team's Grande, under Mike Matz, placed second in the afternoon class in 36.1 while another West German entry, Lutz Merkel on Golden Gate, was third in 36.3.

"We didn't look good at the start," said West German coach Allin Schockemochle, who was Olympic gold medalist at Montreal and leading rider of the Washington show in 1973. "It is the first trip to the United States for all the riders and they were nervous. Now they are settling down."

Junior hunter and pony events also were contested yesterday afternoon, Even Gambel, an 8-year-old bay mare shown by her owner, Karen Leabo of Thomasville, Ga., won the Stombock Saddlery Challenge Trophy as the small pony hunter chanpion.

Reserve champion was Sandy Lytle's Farnley Colorado, four points behind the winner's 13.

Escadrille, Tracy Weinberg's 5-year-old bay mare, scored 10 points in winning the small junior hunter tricolor, single point in front of Green Hill Farm's Comic Story. The large junior working hunter title went to Halikalani after a hack-off with RiFarms's Bridgegroom. Both had five points, as did McCloud, at the finish of the competition. The latter withdrew before the hack-off.

Gigi Caston of Santa Monica, Calif., and her Stacked Deck tied for the amateur-owner jumper championship Thursday the 18-year-old rider had won the coveted Martin Perpetual Trophy on Hereford Farm's Cousin Albert in an international-open bay finished the grueling jumping contest, which began Thursday morning, with 10 points, the same as Mr. and Mrs. Robert Brumder's Fair Warning, ridden by their daughter, Amy.

Hillary Kuhne's Hunky Dory won the junior jumper championship with 11 points, with Virginia Schiffman's The Roofer reserve with 10.

Rob Walters' 7-year-old gray, Shaughnessy, won the Tidbit Challenge Trophy as the medium pony titlist while Gwyned Silver Seal, another gray owned by Mr. and Mrs. Brownlee Currey, won the Pegasus Stable. Perpetual Trophy as large pony champion. Reserve among the large ponies was Southern Gray, the aged gray gelding which had won this tricolor in 1973 and 1974.