British K-type landing Barges in Spanish service
General history
X-Lighters would make a huge difference to amphibious warfare, the craft were designed by naval architect Walter Pollock of James Pollock & Son in 1915. He was summoned to develop a suitable landing craft, taking on Admiralty input – particularly that of the First Sea Lord, ‘Jackie’ Fisher, who was familiar with Pollock’s work and saw the value of the craft in his proposed North Sea and Baltic operations.
The Navy demanded a self-propelled vessel suitable for transporting men, supplies and heavy equipment to shore in an opposed landing. The X-Lighters were designed in just four days, and Pollocks also oversaw their construction. The craft became known as ‘Black Beetles’, due to their black-painted construction, low profile and landing ramp that, when deployed, resembled a stag beetle’s horns.
Orders for 200 were placed and their production given high priority. The 105ft craft displaced some 160 tons and were 21ft across the beam. Each had a distinctive hinged ramp over the bow, which dropped down to disembark infantry. This enabled a platoon to be landed within seconds, while the remainder could filter through in the following minutes.
Although a common design, variances were tolerated to enable smaller yards to maintain swift production. The first X-Lighter launched in April and the Royal Navy received its initial vessels in June, with all delivered by August. With the initial order completed, a further 50 were produced in 1916 to smaller dimensions (98ft long), 25 as stores ships and tenders, with 25 ‘dumb’ (engineless) craft – designated DX-Lighters – for towing. The building of all 250 vessels was spread across 30 shipyards.
The craft were given ‘L’ or ‘K’ numbers depending on their role, though they were officially known by their ‘X’ designation (for example, K77 was X166). Of the original 200, approximately 20 were converted into tenders or similar and one even served as a Q-ship (an armed decoy ship for duping U-boats).
X-Lighters were produced from iron and wood over a metal frame and their spoon-shaped bow and 3½ft draught enabled them to get right up to shore without beaching. Their engine fit varied, but they were unusual in that they were among the earliest small craft to use oil or diesel fuel. Swedish-made Bolinder engines were favoured as Pollocks was their British agent, but two-cylinder engines from six companies were used. Powerplant and screw fit varied between yards (and were often changed postwar) but the most powerful were capable of 7-8kts and used a single screw, while less powerful examples usually incorporated a twin screw and paired engines.
The engine room was encased at the stern with a 450-gal tank on each side. Ahead of those was space for a 16ft dingy, a 12-seat table, a stove and berth for up to a dozen hammocks. Then came the steering and compass platform, protected by an armoured screen. The troop/ cargo well was enclosed and formed 60% of the craft’s length. If necessary, fixtures were provided to secure horses and heavy equipment. At the bow there were two more 450-gal tanks, and a staircase enabled troops clamber up to the hand-lowered ramp, while a portion of the upper deck could drop to provide a stairless exit.
Up to 500 men could be transported in each X-Lighter for short periods, though lack of space was a common gripe. In safe areas, more men were often carried on top. Located amidships was a machine gun platform and shield, which poked out above the deck. Shortages meant the guns were rarely supplied and the platforms were often removed, though a transported party would be keen to lend a Lewis gun to cover their approach.
Specifications:
Displacement: 160 tons
Length: 105ft (32.2 meters)
propulsion: Bolinder semi-diesel, single shaft
Draft: 3.5 ft (1 meter)
Capacity: 500men + 4 crew
Use by Spain
In the mid-1920s Spain bought 26 vessels off the Royal Navy at Gibralter, They were re-numbered K-1 - K-26. These were used as part of the massive amphibious operation at Alhucemas Bay in September 1925 which effectively turned the tide and led to the defeat of Abd el Krim`s rebellion. Most of the craft were used as troop/supply transports but some were modified to carry Ft17 tanks and land them directly on the beaches - in fact due to the nature of the rocky beaches, this never happened and the tanks had to be landed by crane once the defenders had been cleared.