The Marketplace: New Products

Every summer manufacturers make it easier and more seductive for a man to go down to the sea and beach again. Some of their newest lures to a life in the midday sun:

> A chaise longue, powered by a small gasoline engine and equipped with polystyrene foam pontoons, will carry a chap out to sea in semisubmerged comfort. Basic cost: $179.50 at Abercrombie & Fitch.

>If racing is the game, there is the water-bomb Aquakart, a modified fiberglass hydroplane capable of 35 m.p.h. to 50 m.p.h., weighing only 125 Ibs. and available for $745 at Hammacher Schlemmer.

>Fall out of a hydroplane or a chaise longue and what do you do? Inflate an Aqua Aid, worn on the wrist or on the waist in a tiny packet and available to the prudent for only $4.95. It will float a man in prime condition for several lonely hours.

> One of the simplest outdoor grills ever devised is offered by Hammacher Schlemmer for a mere $7.95. Folded it looks like a collapsed knapsack, and unfolded like a square wastebasket with a metal rack perched on top. It cooks a steak in six minutes and uses the most plentiful fuel in the land — old news papers, four sheets to a sirloin.