Fairmile D motor torpedo boat

The Fairmile D motor torpedo boat was a type of British motor torpedo boat (MTB) and motor gunboat (MGB), conceived by entrepreneur Noel Macklin of Fairmile Marine and designed by naval architect Bill Holt for the Royal Navy. Nicknamed "Dog Boats", they were designed to be assembled in kit form mass-produced by the Fairmile organisation and assembled at dozens of small boatbuilding yards around Britain, to combat the known advantages of the German E-boats over previous British coastal craft designs. At 115 feet in length, they were bigger than earlier MTB or motor gunboat (MGB) designs (which were typically around 70 feet) but slower, at 30 knots compared to 40 knots.

1941 Original Programme
The first twelve boats were ordered on 15 March 1941, becoming MGB 601 to MGB 612. Six weeks later, another 28 boats were ordered on 27 April 1941, as MGB 613 to MGB 616, and ML 617 to ML 640, although these MLs were quickly reclassed as MGBs. The prefix for all boats (except early losses 622, 631 and 639) was reclassed from "MGB" to "MTB" in September 1943.

Eight of these boats (nos. 618, 619, 620, 623, 625, 626, 627 and 631) were handed over to the Royal Norwegian Navy in 1942, manned by free Norwegian personnel and formed into the 30th MTB Flotilla under Lt. Ragnvald Tamber. After being worked up at HMS Bee shore base at Weymouth, they were based at Lerwick in the Shetland Islands, and deployed for numerous operations along the Norwegian coast. MTB 631 was captured by the Germans in March 1943 and replaced by MTB 653.

The last eight of the programme (boats nos. 633 to 640) were chosen for Mediterranean operations; they were worked up at HMS Bee at Weymouth before proceeding to Milford Haven, where they were formed into a new 32nd MTB Flotilla under the command of Lt. P. E. Stewart Gould; they were fitted with extra temporary fuel tanks bolted to the upper deck (raising their fuel capacity by 3,000 gallons to 8,000 gallons of 100 octane petrol for the long passage to the Mediterranean), and proceeded in groups to Gibraltar in March/April 1943.

1941 Supplemental Programme
A further 60 boats were ordered in November 1941, numbered from 641 up to 700, of which 16 ordered on 18 November had the prefix of "MGB" (numbers 641 to 648, 657 to 663, and 674), and 44 ordered on 28 November originally had the prefix of "ML" (numbers 649 to 656, 664 to 673, and 675 to 700), although the MLs were quickly reclassed as MGBs. All of these (except early losses) were reclassed as "MTB" in September 1943. However, from No. 697 onwards, the boats were classified as combined "MTB"/"MGB"s.

As with the final eight boats of the preceding programme, 24 boats were chosen for Mediterranean operations; they were worked up at HMS Bee at Weymouth before proceeding to Milford Haven, where they were formed into three new flotillas as follows (with initial flotilla commanders in parentheses): As before, they were fitted with extra temporary fuel tanks bolted to the upper deck (raising their fuel capacity by 3,000 gallons to 8,000 gallons of 100 octane petrol for the long passage to the Mediterranean), and proceeded in groups to Gibraltar in March/April 1943. Note: (a) 674 was the final boat ordered as a MGB, and is thus shown out of numerical sequence.
 * 19th MGB Flotilla (under Lt E.M. ("Mickey") Thorpe): boats nos. 641 to 648 inclusive.
 * 33rd MTB Flotilla (under Lt-Cmdr Ronald R. W. Ashby): boats nos. 649, 651, 654, 655, 656, 665, 667 and 670.
 * 20th MGB Flotilla (under Lt-Cmdr Norman H. Hughes): boats nos. 657 to 663 inclusive, plus 674 (although 674 only joined later).

1942 Original Programme
Another 23 boats were ordered on 7 April 1942 as MTB 701 to MTB 723.

1942 Supplemental Programme
Another 48 boats were ordered on 30 August 1942 as MTB 724 to MTB 771.

1943 Programme
Finally, 58 more were ordered on 26 March 1943 as MTB 772 to MTB 800, and MTB 5001 to MTB 5029 (although MTB 5027 was cancelled, the only Fairmile order not to be built).

History
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Unlike the Fairmile B designs (many of which were built overseas), the "Dog Boats" were only produced in component form in Britain. Some were built for the RAF Marine Branch for use in the long range air-sea rescue role for downed airmen. Altogether, 229 boats were ordered (and 228 built) between 1942 and 1945.

Many versions were produced or converted from existing boats; MGB, MTB, MA/SB, LRRC and post-war FPB.

Since the Fairmile D could be fitted out with a mix of armament that gave it the capabilities of both a motor gunboat and a motor torpedo boat, later-war examples were all completed with a heavy combined armament and universally classified as MTBs. By 1944, the MGB designation was largely dropped by the RN and most of the mid-war (earlier model) Type Ds which had survived were reclassified as MTBs even if they lacked torpedo armament. Mediterranean-based MGBs, however, seem to have retained their MGB pennant numbers to the end of the war.

Two captured boats were put into Kriegsmarine service.

Today the D-type is a popular choice among boat modelers.

There are no known survivors, other than two abandoned wrecks, one in Chatham, England and the other in Ellingsøy, Norway.