National Geographic : 1964 Jun
Tandem propeller submarine undergoes tests in the Navy's David Taylor Model Basin at Car derock, Maryland. This 18-foot model wraps twin propellers around the nose and tail of the hull; adjustable blades controlled by the operator re semble spikes on a dog's collar. Comdr. Frederick R. Haselton, Jr., the designer (at right above sub), built the prototype in his cellar and tested it in a bathtub. He says the craft can hover, turn around on a dime, and even stand on its tail. One of several small submarines privately de veloped for civilian use, this Perry Cubmarine cruised down to 600 feet last February. Biologists will use it to study fish. The 22-foot, two-man bat tery-driven craft can be hauled on an automobile trailer. Here it brings a nondiving engineer (seen in porthole) to direct a diver working on a com munications cable. Dark object under hull is a 112-pound guide weight which allows the craft to "moor" just above the sea floor. EKTACHROME BY THOMASJ. ABERCROMBIE ANDJOSEPH J. SCHERSCHEL(TOP); EKTACHROME BY JERRY GREENBERG;KODACHROMEBYJOSEPH J. SCHERSCHEL(RIGHT) © N.G.S.