Sa'ar 4.5-class missile boats are an enlarged version of the .[1] New ships were longer and consequently they take an augmented armament.[1]
INS Keshet was built at the Israel Shipyards in Port of Haifa. She was launched in October 1982.
The length of this unit is 61.7m (202.4feet), the breadth is 7.6m (24.9feet) and the draught is 2.5m (08.2feet). She has a flush deck, short superstructure located in front of the midship and freeboard. The full load displacement is 488 tonnes.
The total power of engines is 16000hp. Keshet is proppeled by four MTU 16V538 TB93 Diesel engines. The flank speed of her is 31kn; the range is 3000nmi at a speed of about and at .[1]
The primary armament is two quadruple launchers of American Harpoon anti-ship missiles, both allocated behind the superstructure. The missile is able to reach 130km (80miles), the speed is 0.9Mach and the weight of the warhead is 227kg (500lb). Behind them, there are six single launchers of Israeli Gabriel Mark II missiles[2] with a 75kg (165lb) warhead and a range of about 36km (22miles). In service, the Israeli Navy set two 8-fold anti-aircraft Barak 1 launchers with the range of a projectile of 10km (10miles), making the armament identical to one in .[3] [4]
The secondary armament consists of single, dual-purpose gun OTO Melara 76 mm, allocated abaft in a gun turret. The weight of the projectile is 6kg (13lb), the range is 16km (10miles) and the rate of fire is 85 rounds per minute (RPM). The angle of elevation is 85°.[5] [3] There are also two single Oerlikon 20 mm cannon with a range of 2km (01miles) and rate of fire of 900 RPM and one double (or quadruple) station for M2 Browning machine guns.[5] [3] The bow is armed with close-in weapon system, Phalanx CIWS,[1] [2] with the rate of fire 3,000 RPM, and the range 1500m (4,900feet).[5] [3]