Navy lost its first men's varsity heavyweight eight crew race of the season today as Harvard won the Adams Cup for the sixth straight time. The Crimson's margin of victory was five seconds over Pennsylvania, which edged Navy by 1/10th of a second.

The Midshipmen led at the 800-meter mark, but Harvard pulled ahead at the 1,000-meter halfway point and was never challenged. This was Harvard's 29th victory in the 46-year history of the Adams Cup.

Navy's second varsity boat remained unbeaten with a five-second victory over Penn.

In the Callow Cup Lightweight Regatta in Annapolis, Navy beat Penn by three seats. The Midshipmen led by one-half length at 1,000 meters, but had to hold off a late Penn rally. Navy's women also swept three races against Trinity and Washington College.

Because of final examinations, Navy will not race again until May 28 when it will host the University of Wisconsin.

Foul weather scuttled all but one of the races in the Kerr Cup Regatta on the Schuylkill in Philadelphia. Georgetown finished first and second in the second freshmen eight race.

The Hoyas will compete in the Cadle Cup Saturday at Thompson's Boat House, the area college championship regatta.

In high school crew, the T.C. Williams Invitational regatta was canceled yesterday because of rough water at the Alexandria Boat House near the Wilson Bridge. The regatta will not be rescheduled.

The Sandy Run Regatta on April 16 has been rescheduled for next Saturday at 2:30 p.m. at Lake Occoquan. It had been postponed because of poor weather two weeks ago