The Marketplace: New Products for Summer

^ For those who would rather sink than swim, Frankfurt Engineer Hanns Trippel has produced a one-man submarine which was the hit of the recent West Berlin In ternational Boat Show. Made of a glass-silk polyester, the U24 weighs only 485 Ibs., and its four six-volt batteries drive it at about five knots on the surface, slightly faster under water. The U24 can dive as deep as 98 ft., is equipped with an oxygen supply and an air-washing system that allows submersion for eight hours at a time. Dealer Erich Mylius of Hamburg reports more than 500 orders from the boat show alone, most of them from the U.S., and hopes to be turning out 1,500 a month by September. Price: $1,425.> For those who would rather hover than sink: a flying machine that never gets more than 9 in. off the ground. The Dobson Air Dart is a 95-lb. wheelless bug, 8 ft. long and 5 ft. wide, with a kayak-style cockpit and a zo-h.p. engine that drives a fan in the bug’s nose. The fan supports the vehicle on a column of air by the same principle as the larger air-supported vehicles under development for military and commercial transportation. Designed strictly for fun, the Dart can whoosh 300 Ibs. of people about 30 m.p.h. over flat land or smooth water. Price: $595 assembled; about $400 as a kit.

> For smokers who want to avoid flameout: a hurricane-proof cigarette lighter that needs no flint or fuel. Powered by a nickel-cadmium battery that never needs replacement, the Gulton lighter uses a glowing filament like a dashboard lighter. It can be recharged (about three packs’ worth) by plugging it into any AC wall outlet. Price: $14.95.

> For picnickers who forget beer openers: a self-opening beer can, developed by Alcoa, and now marketed in limited areas. Raise one end of a metal tab in the top of the can and POP ! suds all over.

> For fishermen, and fishermen’s wives: dehydrated bait that can be kept indefinitely without refrigeration or stench.

First one on the market is Miracle Shrimp, which has been tested successfully in both fresh and salt water since 1960. About 70¢ buys 12 to 16 pieces of dry bait-sized shrimp, which needs only water to make it tasty again. > For scuba-ho underwater photographers: a new all-weather camera, Nikon’s Nikonos. Drop it overboard, drag it through sand and mud, leave it out in rain and spray, or shoot the wonders of the deep as far as 164 ft. down without an extra housing. Taking 35-mm. film and with an /2.5 Nikkor lens, the Nikonos will sell for approximately $160.