De Havilland DH98 Mosquito (1941) and Aston Martin Ulster Roadster (1936)

De Havilland DH98 Mosquito (1941) and Aston Martin Ulster Roadster (1936)

The de Havilland DH.98 Mosquito was a British multi-job beat plane with a two-gentleman crew that served for the duration of and soon after the Next Entire world War. It was a person of few operational front-line plane of the period constructed just about totally of wood and was nicknamed “The Wood Question”. The Mosquito was also acknowledged affectionately as the “Mossie” to its crews. Originally conceived as an unarmed quick bomber, the Mosquito was adapted to roles including small to medium-altitude daytime tactical bomber, high-altitude evening bomber, pathfinder, day or evening fighter, fighter-bomber, intruder, maritime strike plane, and quick photo-reconnaissance plane. It was also applied by the British Overseas Airways Corporation (BOAC) as a quick transport to have little high-benefit cargoes to, and from, neutral nations, by way of enemy-managed airspace.

When the Mosquito started creation in 1941, it was a person of the swiftest operational plane in the earth. Moving into popular provider in 1942, the Mosquito was a high-speed, high-altitude photo-reconnaissance plane, continuing in this job throughout the war. From mid-1942 to mid-1943 Mosquito bombers flew high-speed, medium or small-altitude missions versus factories, railways and other pinpoint targets in Germany and German-occupied Europe. From late 1943, Mosquito bombers ended up formed into the Light-weight Night time Strike Power and applied as pathfinders for RAF Bomber Command’s heavy-bomber raids. They ended up also applied as “nuisance” bombers, often dropping Blockbuster bombs – 4,000 lb (1,812 kg) “cookies” – in high-altitude, high-speed raids that German evening fighters ended up just about 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. Setting up in July 1942, Mosquito evening-fighter units raided Luftwaffe airfields. As part of a hundred Group, it was a evening fighter and intruder supporting RAF Bomber Command’s heavy bombers and decreased bomber losses for the duration of 1944 and 1945. As a fighter-bomber in the Next Tactical Air Power, the Mosquito took part in “exclusive raids”, these types of as the attack on Amiens Prison in early 1944, and in precision attacks versus Gestapo or German intelligence and security forces. Next Tactical Air Power Mosquitos supported the British Military for the duration of the 1944 Normandy Campaign. From 1943 Mosquitos with RAF Coastal Command strike squadrons attacked Kriegsmarine U-boats (particularly in the 1943 Bay of Biscay, where considerable quantities ended up sunk or destroyed) and intercepting transport ship concentrations.

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

By the early-mid-1930s, de Havilland had a track record for ground breaking high-speed plane with the DH.88 Comet racer. The later on DH.ninety one Albatross airliner pioneered the composite wood development that the Mosquito applied. The 22-passenger Albatross could cruise at 210 miles for every hour (340 km/h) at eleven,000 toes (three,400 m), greater than the a hundred miles for every hour (one hundred sixty km/h) Handley Web page H.P.42 and other biplanes it was replacing. The wood monocoque development not only saved bodyweight and compensated for the small energy of the de Havilland Gipsy Twelve engines applied by this plane, but simplified creation and decreased development time.

Air Ministry bomber prerequisites and concepts:

On eight September 1936, the British Air Ministry issued Specification P.thirteen/36 which referred to as for a twin-engined medium bomber capable of carrying a bomb load of three,000 kilos (1,400 kg) for three,000 miles (4,800 km) with a utmost speed of 275 miles for every hour (443 km/h) at fifteen,000 toes (4,600 m) a utmost bomb load of eight,000 kilos (three,600 kg) which could be carried about shorter ranges was also specified. Aviation companies entered heavy styles with new high-driven engines and a number of defensive turrets, primary to the creation of the Avro Manchester and Handley Web page Halifax.

In May possibly 1937, as a comparison to P.thirteen/36, George Volkert, the main designer of Handley Web page, set ahead the strategy of a quick unarmed bomber. In twenty pages, Volkert planned an aerodynamically clean up medium bomber to have three,000 kilos (1,400 kg) of bombs at a cruising speed of 300 miles for every hour (480 km/h). There was help in the RAF and Air Ministry Captain R N Liptrot, Investigation Director Plane three (RDA3), appraised Volkert’s layout, calculating that its prime speed would exceed the new Supermarine Spitfire. There ended up, nevertheless, counter-arguments that, even though these types of a layout had merit, it would not automatically be speedier than enemy fighters for extensive. The ministry was also thinking about utilizing non-strategic supplies for plane creation, which, in 1938, had led to specification B.nine/38 and the Armstrong Whitworth Albemarle medium bomber, mostly constructed from spruce and plywood attached to a metal-tube frame. The concept of a little, quick bomber attained help at a substantially before phase than occasionally acknowledged while it was not likely that the Air Ministry envisaged it not utilizing light alloy elements.

Project Mosquito:

When layout of the DH.98 had started, de Havilland created mock-ups, the most thorough at Salisbury Hall, in the hangar where E0234 was getting created. Initially, this was developed with the crew enclosed in the fuselage guiding a transparent nose (equivalent to the Bristol Blenheim or Heinkel He 111H), but this was speedily altered to a extra stable nose with a extra standard cover.

The development of the prototype started in March 1940, but do the job was cancelled once again soon after the Struggle of Dunkirk, when Lord Beaverbrook, as Minister of Plane Output, decided there was no creation ability for plane like the DH.98, which was not anticipated to be in provider until eventually early 1941. Whilst Lord Beaverbrook told Air Vice-Marshal Freeman that do the job on the venture had greater stop, he did not difficulty a precise instruction, and Freeman disregarded the ask for. In June 1940, nevertheless, Lord Beaverbrook and the Air Personnel ordered that creation was to aim on 5 present forms, namely 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 venture would be shut down when the layout staff ended up denied the supplies with which to create their prototype.

The Mosquito was only reinstated as a priority in July 1940, soon after de Havilland’s Standard Manager L.C.L Murray, promised Lord Beaverbrook fifty Mosquitoes by December 1941, and this, only soon after Beaverbrook was satisfied that Mosquito creation would not hinder de Havilland’s major do the job of creating Tiger Moth and Oxford trainers and fixing Hurricanes as properly as the licence manufacture of Merlin engines. In promising Beaverbrook fifty Mosquitoes by the close of 1941, de Havilland was having a gamble, simply because it was not likely that fifty Mosquitos could be created in these types of a limited time as it transpired only twenty Mosquitos ended up created in 1941, but the other thirty ended up sent by mid-March 1942.

In the course of the Struggle of Britain, approximately a 3rd of de Havilland’s manufacturing facility time was missing simply because the workers took cover in the factory’s bomb shelters. Even so, do the job on the prototype went speedily, these types of that E0234 was rolled out on 19 November 1940.

In the aftermath of the Struggle of Britain, the primary purchase was altered to twenty bomber variants and thirty fighters. It was still uncertain no matter if the fighter edition really should have dual or one controls, or really should have a turret, so three prototypes ended up at some point created: W4052, W4053 and W4073. The latter, both turret armed, ended up later on disarmed, to develop into the prototypes for the T.III trainer. This caused some delays as half-created wing elements had to be strengthened for the anticipated increased beat load prerequisites. The nose sections also had to be altered, omitting the crystal clear perspex bomb-aimer’s situation, to stable noses developed to household four .303 machine guns and their ammunition.


The Mosquito was a quick, twin-engined plane with shoulder-mounted wings. The most-produced variant, selected the FB Mk VI (Fighter-bomber Mark 6), was driven by two Merlin Mk 23 or Mk 25 engines driving three-bladed de Havilland hydromatic propellers. The regular 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 2,000 kilos (910 kg) of bombs, or eight RP-three unguided rockets.


The oval-segment fuselage was a frameless monocoque shell created in two halves getting formed to form by band clamps about a mahogany or concrete mould, every holding a person half of the fuselage, split vertically. The shell halves ended up made of sheets of Ecuadorean balsawood sandwiched concerning sheets of Canadian birch, but in regions needing more strength— these types of as along reduce-outs— more powerful woods replaced the balsa filler the general thickness of the birch and balsa sandwich skin was only 7⁄16 inch (eleven mm). This sandwich skin was so stiff that no inner reinforcement was essential from the wing’s rear spar to the tail bearing bulkhead. The join was along the vertical centre line. This split development significantly aided the assembly of the inner gear as it permitted the specialists straightforward entry to the fuselage inside. While the glue in the plywood skin dried, carpenters reduce a sawtooth joint into the edges of the fuselage shells, when other workers mounted the controls and cabling on the inside of wall. When the glue fully dried, the two halves ended up glued and screwed jointly. The fuselage was strengthened internally by 7 bulkheads made up of two plywood skins parted by spruce blocks, which formed the basis on every half for the outer shell. Each bulkhead was a repeat of the spruce layout for the fuselage halves a balsa sheet sandwich concerning two plywood sheets/skins. Bulkhead quantity 7 carried the fittings and loads for the tailplane and rudder, The sort of glue at first applied was Casein, which was later on replaced by “Aerolite”, a artificial urea-formaldehyde, which was extra sturdy. Quite a few other forms of screws and flanges (made of many woods) also held the composition jointly.

The fuselage development joints ended up made from balsa wood and plywood strips with the spruce multi-ply getting linked by a balsa V joint, along with the inside frame. The spruce would be bolstered by plywood strips at the stage where the two halves joined to sort the V-joint. Found on prime of the joint the plywood formed the outer skin. In the course of the becoming a member of of the two halves (“boxing up”), two laminated wood clamps would be applied in the soon after portion of the fuselage to act as help. A covering of doped Madapolam (a great basic woven cotton) cloth was stretched tightly about the shell and a coat of silver dope was utilized, soon after which the exterior camouflage was utilized. The fuselage had a substantial ventral segment reduce-out, which was braced for the duration of development, to let it to be lowered onto the wing centre-segment. When the wing was secured the reduced panels ended up replaced, and the bomb bay or armament doors equipped.

The all-wood wing was created as a a person-piece composition and was not divided into independent development sections. It was made up of two key spars, spruce and plywood compression ribs, stringers, and a plywood covering. The outer plywood skin was coated and doped like the fuselage. The wing was mounted into the roots by signifies of four substantial attachment details. The engine radiators ended up equipped in the interior wing, just outboard of the fuselage on possibly side. These gave a lot less drag. The radiators themselves ended up split into three sections: an oil cooler segment outboard, the middle segment forming the coolant radiator and the inboard segment serving the cabin heater. The wing contained metallic framed and skinned ailerons, but the flaps ended up made of wood and ended up hydraulically managed. The nacelles ended up mainly wood, even though, for power, the engine mounts ended up all metallic as ended up the undercarriage areas. Engine mounts of welded metal tube ended up additional, along with uncomplicated landing equipment oleos loaded with rubber blocks. Wooden was applied to have only in-airplane loads, with metallic fittings applied for all triaxially loaded elements these types of as landing equipment, engine mounts, management area mounting brackets, and the wing-to-fuselage junction. The outer primary wing edge had to be brought 22 inches (56 cm) even further ahead to accommodate this layout. The key tail device was all wood created. The management surfaces, the rudder and elevator, ended up aluminium framed and cloth coated. The complete bodyweight of metallic castings and forgings applied in the plane was only 280 lb (one hundred thirty kg).

In November 1944, numerous crashes transpired in the Considerably East. At to start with, it was assumed these ended up as a final result of wing composition failures. The casein glue, it was claimed, cracked when exposed to extraordinary heat and/or monsoon circumstances. This caused the upper surfaces to “elevate” from the key spar. An investigating staff led by Significant Hereward de Havilland travelled to India and produced a report in early December 1944 stating that “the mishaps ended up not caused by the deterioration of the glue but by shrinkage of the airframe for the duration of the moist monsoon year”. Nevertheless a later on inquiry by Cabot & Myers absolutely attributed the mishaps to faulty manufacture and this was confirmed by a even further investigation staff by the Ministry of Plane Output at Defford which uncovered faults in 6 various Marks of Mosquito (all created at de Havilland’s Hatfield and Leavesden plants) which showed equivalent flaws, and none of the plane had been exposed to monsoon circumstances or termite attack as a result it was concluded that there ended up development flaws uncovered at the two plants. It was uncovered that the “Normal of glueing…left substantially to be desired”. Data at the time showed that mishaps caused by “loss of management” ended up three occasions extra regular on Mosquitoes than on any other sort of plane. The Air Ministry forestalled any loss of self confidence in the Mosquito by holding to Significant de Havilland’s first investigation in India that the mishaps ended up caused “mostly by climate” To clear up the problem, a sheet of plywood was set along the span of the wing to seal the complete size of the skin joint along the key spar.

Details with regards 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 about by race driver A. C. Bertelli. He developed a 1.five-litre, SOHC engine which would at some point energy the LeMans-racing Ulster. Thoughout the a long time the engine was devloped to incorporate dry sump lubrication.

The Aston Martin Ulster stands as a person of the most respected pre-war racecars. It was mostly dependent on the Mark II which came right before it.

The Ulster had a breif two 12 months race application. In the course of this time they dominated the British Vacationer Trophy at Goodwood. In 1934, Ulsters took to start with, 2nd and 3rd place. The best LeMans final result was reached in 1935. Chassis LM20 raced to 3rd general which set it to start with in the 1101 to 1500cc class.

Following the race efforts, Aston Martin readied a creation edition of the LeMans cars. Twenty-1 of these cars ended up created of which all are accounted for currently.

Aston Martin Ulster information and facts applied from:


In the 1980’s a little quantity (seven) replicas of the Aston Martin Ulster Roadster ended up made as a kit vehicle:

Fergus Mosquito (Aston Martin Ulster duplicate)

Kop Hill Climb – 25th September 2011

Fergus Mosquito – an Aston Martin Ulster duplicate.

Only 7 ended up made in Kingsbridge, Devon, in the eighties, utilizing donor Morris Marina B-collection engines and other areas.

UIJ233 is the best of the seven replicas.

These two designs, the de Havilland DH98 Mosquito plane and the Aston Martin Ulster Roadster of 1936 have been developed in Lego miniland scale for Flickr LUGNuts’ 79th Construct Problem, – ‘LUGNuts goes Wingnuts” – showcasing automotive vehicles named soon after, inspired by or similar to plane.

Posted by lego911 on 2014-06-10 06:39:28

Tagged: , de , Havilland , DH98 , Mosquito , mozzie , plane , plane , airplane , aeroplane , WWII , fighter , bomber , RAF , airforce , Merlin , V12 , aston , martin , ulster , MkII , roadster , fergus , speedster , auto , vehicle , moc , design , miniland , lego , lego911 , lugnuts , problem , 79 , LUGNuts goes Wingnuts , ldd , render , cad , povray , typical , vintage , racer , British isles , britain , england , BRG , kit , duplicate , 1930s , nineteen forties , foitsop