De Havilland DH98 Mosquito (1941)

De Havilland DH98 Mosquito (1941)

The de Havilland DH.98 Mosquito was a British multi-role combat aircraft with a two-gentleman crew that served for the duration of and soon after the Second Earth War. It was one particular of couple operational front-line aircraft of the period constructed pretty much solely of wooden and was nicknamed “The Picket Wonder”. The Mosquito was also recognized affectionately as the “Mossie” to its crews. Initially conceived as an unarmed rapid bomber, the Mosquito was adapted to roles including reduced to medium-altitude daytime tactical bomber, substantial-altitude evening bomber, pathfinder, day or evening fighter, fighter-bomber, intruder, maritime strike aircraft, and rapid photograph-reconnaissance aircraft. It was also used by the British Abroad Airways Corporation (BOAC) as a rapid transportation to have small substantial-value cargoes to, and from, neutral international locations, as a result of enemy-managed airspace.

When the Mosquito started generation in 1941, it was one particular of the swiftest operational aircraft in the entire world. Entering popular assistance in 1942, the Mosquito was a substantial-speed, substantial-altitude photograph-reconnaissance aircraft, continuing in this role through the war. From mid-1942 to mid-1943 Mosquito bombers flew substantial-speed, medium or reduced-altitude missions towards factories, railways and other pinpoint targets in Germany and German-occupied Europe. From late 1943, Mosquito bombers were shaped into the Light-weight Evening Strike Force and used as pathfinders for RAF Bomber Command’s major-bomber raids. They were also used as “nuisance” bombers, often dropping Blockbuster bombs – 4,000 lb (one,812 kg) “cookies” – in substantial-altitude, substantial-speed raids that German evening fighters were pretty much powerless to intercept.

As a evening fighter, from mid-1942, the Mosquito intercepted Luftwaffe raids on the United Kingdom, notably defeating Procedure Steinbock in 1944. Starting off in July 1942, Mosquito evening-fighter units raided Luftwaffe airfields. As element of one hundred Group, it was a evening fighter and intruder supporting RAF Bomber Command’s major bombers and reduced bomber losses for the duration of 1944 and 1945. As a fighter-bomber in the Second Tactical Air Force, the Mosquito took element in “distinctive raids”, this kind of as the attack on Amiens Jail in early 1944, and in precision attacks towards Gestapo or German intelligence and security forces. Second Tactical Air Force Mosquitos supported the British Military for the duration of the 1944 Normandy Marketing campaign. From 1943 Mosquitos with RAF Coastal Command strike squadrons attacked Kriegsmarine U-boats (significantly in the 1943 Bay of Biscay, the place major figures were sunk or ruined) and intercepting transportation ship concentrations.

The Mosquito flew with the Royal Air Force (RAF) and other air forces in the European theatre, and the Mediterranean and Italian theatres. The Mosquito was also used by the RAF in the South East Asian theatre, and by the Royal Australian Air Force (RAAF) based mostly in the Halmaheras and Borneo for the duration of the Pacific War.

By the early-mid-nineteen thirties, de Havilland experienced a reputation for revolutionary substantial-speed aircraft with the DH.88 Comet racer. The later on DH.91 Albatross airliner pioneered the composite wooden construction that the Mosquito used. The 22-passenger Albatross could cruise at 210 miles for every hour (340 km/h) at eleven,000 feet (3,four hundred m), improved than the one hundred miles for every hour (one hundred sixty km/h) Handley Web site H.P.42 and other biplanes it was replacing. The wooden monocoque construction not only saved fat and compensated for the reduced electric power of the de Havilland Gipsy Twelve engines used by this aircraft, but simplified generation and reduced construction time.

Air Ministry bomber specifications and principles:

On eight September 1936, the British Air Ministry issued Specification P.thirteen/36 which named for a twin-engined medium bomber capable of carrying a bomb load of 3,000 pounds (one,four hundred kg) for 3,000 miles (4,800 km) with a maximum speed of 275 miles for every hour (443 km/h) at fifteen,000 feet (4,600 m) a maximum bomb load of eight,000 pounds (3,600 kg) which could be carried more than shorter ranges was also specified. Aviation corporations entered major types with new substantial-run engines and a number of defensive turrets, top to the generation of the Avro Manchester and Handley Web site Halifax.

In May perhaps 1937, as a comparison to P.thirteen/36, George Volkert, the chief designer of Handley Web site, put ahead the idea of a rapid unarmed bomber. In twenty webpages, Volkert prepared an aerodynamically clean up medium bomber to have 3,000 pounds (one,four hundred kg) of bombs at a cruising speed of three hundred miles for every hour (480 km/h). There was guidance in the RAF and Air Ministry Captain R N Liptrot, Study Director Aircraft 3 (RDA3), appraised Volkert’s design, calculating that its prime speed would exceed the new Supermarine Spitfire. There were, nevertheless, counter-arguments that, although this kind of a design experienced advantage, it would not automatically be speedier than enemy fighters for very long. The ministry was also thinking about making use of non-strategic resources for aircraft generation, which, in 1938, experienced led to specification B.nine/38 and the Armstrong Whitworth Albemarle medium bomber, largely constructed from spruce and plywood attached to a metal-tube body. The idea of a small, rapid bomber gained guidance at a a lot before phase than at times acknowledged while it was unlikely that the Air Ministry envisaged it not making use of light alloy components.

Task Mosquito:

After design of the DH.98 experienced begun, de Havilland built mock-ups, the most in depth at Salisbury Corridor, in the hangar the place E0234 was getting built. Initially, this was designed with the crew enclosed in the fuselage guiding a clear nose (related to the Bristol Blenheim or Heinkel He 111H), but this was promptly altered to a additional good nose with a additional standard cover.

The construction of the prototype started in March 1940, but perform was cancelled yet again soon after the Fight of Dunkirk, when Lord Beaverbrook, as Minister of Aircraft Manufacturing, determined there was no generation ability for aircraft like the DH.98, which was not expected to be in assistance right up until early 1941. Despite the fact that Lord Beaverbrook instructed Air Vice-Marshal Freeman that perform on the task experienced improved stop, he did not situation a certain instruction, and Freeman disregarded the request. In June 1940, nevertheless, Lord Beaverbrook and the Air Staff ordered that generation was to aim on five existing types, specifically the Supermarine Spitfire, Hawker Hurricane, Vickers Wellington, Armstrong-Whitworth Whitley and the Bristol Blenheim. Work on the DH.98 prototype stopped, and it appeared that the task would be shut down when the design crew were denied the resources with which to develop their prototype.

The Mosquito was only reinstated as a priority in July 1940, soon after de Havilland’s General Manager L.C.L Murray, promised Lord Beaverbrook 50 Mosquitoes by December 1941, and this, only soon after Beaverbrook was happy that Mosquito generation would not hinder de Havilland’s principal perform of developing Tiger Moth and Oxford trainers and restoring Hurricanes as very well as the licence manufacture of Merlin engines. In promising Beaverbrook 50 Mosquitoes by the finish of 1941, de Havilland was taking a gamble, mainly because it was unlikely that 50 Mosquitos could be built in this kind of a restricted time as it transpired only twenty Mosquitos were built in 1941, but the other thirty were sent by mid-March 1942.

Throughout the Fight of Britain, approximately a third of de Havilland’s factory time was lost mainly because the workers took deal with in the factory’s bomb shelters. Yet, perform on the prototype went promptly, this kind of that E0234 was rolled out on 19 November 1940.

In the aftermath of the Fight of Britain, the first order was adjusted to twenty bomber variants and thirty fighters. It was nonetheless uncertain whether the fighter version should really have twin or solitary controls, or should really have a turret, so three prototypes were at some point built: W4052, W4053 and W4073. The latter, equally turret armed, were later on disarmed, to turn out to be the prototypes for the T.III coach. This induced some delays as 50 %-built wing components experienced to be strengthened for the expected increased combat load specifications. The nose sections also experienced to be altered, omitting the apparent perspex bomb-aimer’s place, to good noses designed to property four .303 machine guns and their ammunition.


The Mosquito was a rapid, twin-engined aircraft with shoulder-mounted wings. The most-created variant, designated the FB Mk VI (Fighter-bomber Mark six), was run by two Merlin Mk 23 or Mk twenty five engines driving three-bladed de Havilland hydromatic propellers. The normal set armament for an FB Mk VI was four Browning .303 machine guns and four twenty mm Hispano cannon when the offensive load consisted of up to two,000 pounds (910 kg) of bombs, or 8 RP-3 unguided rockets.


The oval-portion fuselage was a frameless monocoque shell built in two halves getting shaped to form by band clamps more than a mahogany or concrete mould, every single holding one particular 50 % of the fuselage, split vertically. The shell halves were manufactured of sheets of Ecuadorean balsawood sandwiched amongst sheets of Canadian birch, but in places needing added strength— this kind of as alongside minimize-outs— stronger woods replaced the balsa filler the over-all thickness of the birch and balsa sandwich pores and skin was only 7⁄16 inch (eleven mm). This sandwich pores and skin was so stiff that no inner reinforcement was important from the wing’s rear spar to the tail bearing bulkhead. The sign up for was alongside the vertical centre line. This split construction drastically aided the assembly of the inner devices as it authorized the technicians simple entry to the fuselage interior. Whilst the glue in the plywood pores and skin dried, carpenters minimize a sawtooth joint into the edges of the fuselage shells, when other workers put in the controls and cabling on the inside wall. When the glue fully dried, the two halves were glued and screwed alongside one another. The fuselage was strengthened internally by 7 bulkheads manufactured up of two plywood skins parted by spruce blocks, which shaped the foundation on every single 50 % for the outer shell. Each and every bulkhead was a repeat of the spruce design for the fuselage halves a balsa sheet sandwich amongst two plywood sheets/skins. Bulkhead range 7 carried the fittings and hundreds for the tailplane and rudder, The kind of glue initially used was Casein, which was later on replaced by “Aerolite”, a artificial urea-formaldehyde, which was additional strong. Lots of other types of screws and flanges (manufactured of numerous woods) also held the structure alongside one another.

The fuselage construction joints were manufactured from balsa wooden and plywood strips with the spruce multi-ply getting related by a balsa V joint, alongside with the interior body. The spruce would be bolstered by plywood strips at the issue the place the two halves joined to form the V-joint. Situated on prime of the joint the plywood shaped the outer pores and skin. Throughout the joining of the two halves (“boxing up”), two laminated wooden clamps would be used in the soon after part of the fuselage to act as guidance. A masking of doped Madapolam (a high-quality simple woven cotton) cloth was stretched tightly more than the shell and a coat of silver dope was applied, soon after which the exterior camouflage was applied. The fuselage experienced a huge ventral portion minimize-out, which was braced for the duration of construction, to permit it to be reduced onto the wing centre-portion. After the wing was secured the reduce panels were replaced, and the bomb bay or armament doors equipped.

The all-wooden wing was built as a one particular-piece structure and was not divided into individual construction sections. It was manufactured up of two most important spars, spruce and plywood compression ribs, stringers, and a plywood masking. The outer plywood pores and skin was coated and doped like the fuselage. The wing was put in into the roots by suggests of four huge attachment points. The motor radiators were equipped in the inner wing, just outboard of the fuselage on both side. These gave much less drag. The radiators them selves were split into three sections: an oil cooler portion outboard, the middle portion forming the coolant radiator and the inboard portion serving the cabin heater. The wing contained steel framed and skinned ailerons, but the flaps were manufactured of wooden and were hydraulically managed. The nacelles were largely wooden, although, for energy, the motor mounts were all steel as were the undercarriage pieces. Motor mounts of welded metal tube were added, alongside with simple landing equipment oleos filled with rubber blocks. Wooden was used to have only in-airplane hundreds, with steel fittings used for all triaxially loaded components this kind of as landing equipment, motor mounts, control surface mounting brackets, and the wing-to-fuselage junction. The outer top wing edge experienced to be introduced 22 inches (fifty six cm) even further ahead to accommodate this design. The most important tail device was all wooden built. The control surfaces, the rudder and elevator, were aluminium framed and cloth coated. The whole fat of steel castings and forgings used in the aircraft was only 280 lb (a hundred thirty kg).

In November 1944, quite a few crashes occurred in the Far East. At first, it was thought these were as a end result of wing structure failures. The casein glue, it was claimed, cracked when uncovered to serious warmth and/or monsoon disorders. This induced the upper surfaces to “raise” from the most important spar. An investigating crew led by Important Hereward de Havilland travelled to India and created a report in early December 1944 stating that “the accidents were not induced by the deterioration of the glue but by shrinkage of the airframe for the duration of the soaked monsoon season”. Nevertheless a later on inquiry by Cabot & Myers definitely attributed the accidents to faulty manufacture and this was confirmed by a even further investigation crew by the Ministry of Aircraft Manufacturing at Defford which discovered faults in six distinct Marks of Mosquito (all built at de Havilland’s Hatfield and Leavesden plants) which showed related problems, and none of the aircraft experienced been uncovered to monsoon disorders or termite attack so it was concluded that there were construction problems discovered at the two plants. It was discovered that the “Conventional of glueing…still left a lot to be desired”. Information at the time showed that accidents induced by “decline of control” were three instances additional repeated on Mosquitoes than on any other kind of aircraft. The Air Ministry forestalled any decline of self-assurance in the Mosquito by holding to Important de Havilland’s original investigation in India that the accidents were induced “largely by climate” To address the dilemma, a sheet of plywood was set alongside the span of the wing to seal the complete duration of the pores and skin joint alongside the most important spar.

Information and facts relating to the de Havilland DH98 Mosquito has been taken from excerpts contained on Wikipedia

Aston Martin Ulster Roadster (1936)

In 1927 Aston Martin was taken more than by race driver A. C. Bertelli. He designed a one.5-litre, SOHC motor which would at some point electric power the LeMans-racing Ulster. Thoughout the decades the motor was devloped to incorporate dry sump lubrication.

The Aston Martin Ulster stands as one particular of the most revered pre-war racecars. It was largely based mostly on the Mark II which came right before it.

The Ulster experienced a breif two calendar year race application. Throughout this time they dominated the British Vacationer Trophy at Goodwood. In 1934, Ulsters took first, 2nd and third place. The best LeMans end result was attained in 1935. Chassis LM20 raced to third over-all which put it first in the 1101 to 1500cc course.

Soon after the race attempts, Aston Martin readied a generation version of the LeMans cars. 20-Just one of these cars were built of which all are accounted for currently.

Aston Martin Ulster facts used from:


In the 1980’s a small range (7) replicas of the Aston Martin Ulster Roadster were produced as a kit auto:

Fergus Mosquito (Aston Martin Ulster reproduction)

Kop Hill Climb – 25th September 2011

Fergus Mosquito – an Aston Martin Ulster reproduction.

Only 7 were manufactured in Kingsbridge, Devon, in the eighties, making use of donor Morris Marina B-collection engines and other pieces.

UIJ233 is the best of the 7 replicas.

These two versions, the de Havilland DH98 Mosquito aircraft and the Aston Martin Ulster Roadster of 1936 have been designed in Lego miniland scale for Flickr LUGNuts’ 79th Make Obstacle, – ‘LUGNuts goes Wingnuts” – featuring automotive motor vehicles named soon after, inspired by or connected to aircraft.

Posted by lego911 on 2014-06-twelve 03:33:24

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