HENLEY-ON-THAMES, ENGLAND, JULY 4 -- Crews representing the Ridley Boat Club of Canada set a course record today in one event and earned a spot in the final of another today at the 148th Henley Royal Regatta on the Thames River.

The Ridley four, world champion in 1985, came back from a quarter-length deficit to beat the Igor-Offenbach Rowing Club and Mannheim Rowing Club of West Germany. Ridley set a course record of 6 minutes 35 seconds over the 1-mile 550-yard course.

The Ridley eight, selected to represent Canada at the world championships, withstood a challenge from Harvard to advance to Sunday's final of the Grand Challenge Cup. Ridley will face a Soviet Army crew in that race.

In the Diamond Challenge Sculls, West Germany's five-time world champion Peer-Michael Kolbe easily defeated the Soviet Union's Yuri Janson. Kolbe, who has never raced in a Henley final, will face world championship bronze medalist Vasili Yakushka of the Soviet Union.

In the semifinals of the Silver Goblets and Nickalls' Cup for pairs, British world coxed pairs champions Steven Redgrave and Andy Holmes rowed to victory to earn a final matchup against world coxless pairs champions, Nikolai and Yuri Pimenov of the Soviet Union.

Yale was eliminated from the Ladies' Plate competition, narrowly losing to Tideway Scullers' School in a semifinal. Tideway led from the start, but Yale pulled to within a canvas. Tideway then increased its striking rate to move ahead and win by half a length.

Independence Day Regatta:

In Philadelphia, the Potomac Boat Club finished third in the final of the men's lightweight eight. Potomac completed the 2,000-meter course on the Schuylkill in 7:02.02, finishing behind Adanac of Canada, which won in 6:11.1 and Riverside of Cambridge, Mass., which was second on 6:31.1. Occoquan of Virginia was fourth in 7:10.5.

In addition, Potomac qualified for Sunday finals in the intermediate four, senior eight, and intermediate eight. Paul McKeon advanced in the intermediate lightweight singles.