The Javelin 38 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It has a masthead sloop rig with 577 sq ft (53.6 m2) of sail. The hull has a spooned, raked stem; a raised counter, plumb transom and a fixed fin keel. A few boats were built with a yawl rig with 633 sq ft (58.8 m2) of sail. It displaces 16,000 lb (7,257 kg) and carries 4,760 lb (2,159 kg) of ballast.[1][3]
The boat has a draft of 5.25 ft (1.60 m) with the standard keel.[1][3]
The boat is fitted with a Universal Atomic 4 20 hp (15 kW) gasoline engine for docking and maneuvering. The fuel tank holds 35 U.S. gallons (130 L; 29 imp gal) and the fresh water tank has a capacity of 100 U.S. gallons (380 L; 83 imp gal).[1][3]
The design has a hull speed of 6.7 kn (12.4 km/h).[3]