Uxbridge bunker

After Bentley Priory and an excellent lunch at “The Alpine” we drove 16 km soutwest to reach the bunker and museum in Uxbridge, the home of Fighter Command No.11 Group from 1939 to 1958.

Uxbridge_01

We gathered near two gate-guards for an introduction, before…Uxbridge_02

…starting the descent…Uxbridge_03

…making it through the ghostly guard…Uxbridge_04

…and then further down, down…Uxbridge_05

…to the centre of the bunker. It was constructed between February and August 1939 and became operational on the 25th August, just nine days before the outbreak of the Second World War. Uxbridge_06

The picture above is from “the days” and you will see how almost everything is today standing exactly as it was then.Uxbridge_07

Being here is amazing and quite emotional. In April 1940 Air Vice-Marshal Keith Park was posted to No.11 Group as its Air Officer Commanding. Uxbridge_08

The plotting room with desks for staff just above it and then the control rooms above with curved glass to allow view of the plotting table and all the other information.Uxbridge_09

We gathered around the table, still with its original map…Uxbridge_10

…and had a brilliant guide explaining all and everything.Uxbridge_11

This room is set up and equipped to enable decisions and orders based on all available facts. Here is weather information for all the airfields.Uxbridge_12

This is the bunker for the 11th group responsible for the defence of the area south-east of London. Similar rooms were used by the other groups. Keith Park had his own ideas on the use of tactics. He sent up his squadrons more or less “one by one” after each other. The effect was of course that the British were outnumbered by the Germans but the effect Park sought was that his tactics made it possible to quickly respond to attacks and also created a continuous flow of new attacks on the Germans.

North of London was the 12th group, led by Air Chief Marshal Sir Trafford Leigh-Mallory. His tactics were very different to Parks. Leigh-Mallory wanted to create huge formations of fighters before attacking. In many occasions this took such a long time, the 12th group came too late for battle and Park complained bitterly about how 12th group let him down.Uxbridge_13

The table is set up like it would have been at 11:30 on 15 September 1940 – today known as the “Battle of Britain Day”. “H” stands for hostile so H04, H06 and H10 are enemies picked up and followed by radar. The red labels tells us that there are 30+, 30+ and 20+ aircraft, in total more than 80. The arrows behind them shows plotting of earlier locations…Uxbridge_14

…according to this system. It is now 11:30 so the five last plots (blue arrows) were based on observations during the last five minutes, the yellow arrows four minutes before that. It seems radar picked them up nine minutes ago. The next information will move the “H” blocks forward and there will be a red arrow. The arrows also allows for calculation of the speed.
Uxbridge_13b

Based on the information orders have been sent out to the fighter squadrons. The yellow labels shows the squadron number. The red label is the number of aircraft and the blue tells the altitude. “Angels 15” is 15,000 ft (4,500 m). The block is placed at the position where the fighters are ordered to position to meet the enemy.
Uxbridge_15

Everything is managed from here where the commanding officers were giving the orders. On this day (15 September 1940) Churchill was visiting and stood here watching the battle develop. In his memoirs Churchill wrote about his visit that day and about the moment at which “all of the bulbs glowed red”, referring to the squadron state boards in the Operations Room and indicating that every No.11 Group squadron was engaged in combat at the same time.Uxbridge_16

This museum also has a few rooms packed with all kinds of interesting things…Uxbridge_17

…so arranging a visit to the “Battle of Britain Bunker” will not be a disappointment!

Share
Posted in All, The Dowding System | 1 Comment

The Dowding system and the Filter Room

The so called “Dowding System” consisted of several parts:

  • The British radars could pick up enemies as far away as 200 km. This gave enough time to assess size and tracks of the attacking units and to prepare and scramble the defending fighters.
  • Visual observers would refine this with information on aircraft numbers, types and altitude, using triangulation based on radar distance and the observed angle.
  • The radar and visual observations passed through a filter room before reaching control rooms.
  • The information was received, filtered and relayed quick enough to make scrambling of fighters possible for them to meet the enemy before they reached their targets.
  • Once airborne, the fighters were directed towards the enemy and kept on receiving updated information during the engagement.
  • After each mission fighter’s were quickly refueled and armed for the next sortie.

Filter_02

The system was created using standardisation. Every person in the system had a specific task and worked according to standardised procedures. Anyone in the system (a plotter, pilot, controller or observer) could this way be transferred to another unit and continue working exactly the same way.

Filter_01

Let’s have a look at the “filter room”.  This picture above is a war-time photo of the filter room at Bentley Priory.

The idea of a “filter room” came from Squadron leader Raymond Hart. He created the first “filter room” at an experimental radar station at Bawdsey in July 1937. It was quickly realised how well it worked and already in October the same year it was moved to the Bentley Priory.

Filter_04

A full-size museum model of the original “filter room” has been created in the room where it was originally located. In the middle of 1940 the equipment was however moved to an underground bunker in the Bentley Priory grounds.

The role of the filter room was to collect, and as accurately as possible analyse, information coming from radar stations along the British coast. The “filtered” information was then forwarded to the “Command and Group Operations Room” at Bentley Priory but also to the different “Sector Control Rooms” where the information was used to give orders to the fighter squadrons.

Filter_06

The information from all radar stations was plotted on a gridded map table. Each plotter placed coloured counters on the map to describe the received information.

Filter_03The activity around the table often became frenetic with lots of highly skilled staff engaged in the plotting.

Filter_05

The filterer’s job was the most difficult. It was about gathering all information quickly, try to see a pattern and determine which scenario was the most likely.  The filtering of this information included to assess the information (was it enemy or friendly aircraft or even birds?) and for enemy aircraft to determine the track and then to pass this information to the Operations Rooms and Control Rooms.

What is most interesting is that Germany had even more advanced equipment but did not use it to support the Luftwaffe units. The German radar-system was more advanced but not used and the Luftwaffe pilots had no comparable ground control system. The pilots only communicated with pilots in their own squadron. German fighters were not even communicating with the bombers they defended!

The German intelligence was also insufficient. Instead of attacking the fighter airfields they often attacked bomber airfields. During the Battle of Britain only one fighter airfield was knocked out for more than 24 hours. The German tactics for their fighters were not efficient. The Me109 was superior to the British fighters; it had better fire-power and diving capabilities. Still it was ordered to fly as close escort to slow bombers in a way that took away the advantage of high speed.

You might say that the Battle of Britain was a battle between an attacking Germany with more advanced technology and greater numbers versus a defending Britain with a coherent system and excellent tactics.

Share
Posted in All, The Dowding System | 2 Comments

Bentley Priory

Monday our bus brought us to “Bentley Priory Museum” –
from where the battle was won“!

BentleyPriory_01

This beautiful country house, near Watford 25 km northwest of London, was the Headquarters of…BentleyPriory_02

…Fighter Command during the Battle of Britain. These gate-guards outside… BentleyPriory_03

…and beautiful stained glass windows inside shows the importance of this building.

Before the war Hugh Dowding was the Air Member for Supply and Research at the Air Ministry. In that capacity he oversaw two vital developments. The first was the development of fast fighter aircraft and the second was to provide funding for the first experimental RADAR (then known as RDF) stations on the coast.

Bentley Priory was the base for Air Chief Marshal Sir Hugh Dowding, Commander-in-Chief of RAF Fighter Command, during the Battle of Britain. At the beginning of the war, 16 May 1940, Dowding said:

I believe that, if an adequate fighter force is kept in this country, if the fleet remains in being, and if Home Forces are suitably organized to resist invasion, we should be able to carry on the war single-handed for some time, if not indefinitely. But, if the Home Defence Force is drained away in desperate attempts to remedy the situation in France, defeat in France will involve the final, complete and irremediable defeat of this country.

BentleyPriory_04

Dowding oversaw the world’s first integrated system of air defence, which became known as the ‘Dowding System’. After the war he said:

Mine was the purely defensive role of trying to stop the possibility of an invasion, and thus giving the country a breathing spell … it was Germany’s objective to win the war by invasion, and it was my job to prevent such an invasion from taking place.”BentleyPriory_05

Among other things to explore the Bentley Priory has this beautiful circular room. Here the museum tells the story of “the few” using photographs, medals and artefacts relating to the aircrew, including log-books. A few examples:BentleyPriory_06

Group Captain Dennis “Hurricane” David fought in the Battle of France, the Battle of Britain and against the Japanese in South East Asia. Flying Hurricanes he had 20 confirmed and 5 unconfirmed destroyed enemy aircraft. After the war, as an air attache in Budapest, he helped 400 Hungarians to flee the Soviets and became known as “The Light Blue Pimpernel”.BentleyPriory_07

Squadron leader Thomas Clifford “Tony” Iveson fought in the Battle of Britain as a Spitfire pilot but later qualified as a Lancaster pilot as part of the famous “Dambuster” bomber squadron and he took part in the sinking of “Tirpitz” in Norway. BentleyPriory_08

Wing Commander Vernon C. “Woody” Woodward sailed from Canada to England to join the RAF. He started flying the Gladiator in Egypt where he earned the Distinguished Flying Cross (DFC), then Hurricanes in Greece and Crete. After some time as a flying instructor in Rhodesia he returned to Egypt and later moved to the Middle East flying transport aircraft. “Woody” was Canada’s second highest scoring pilot of the war with a combat record of 4 destroyed, 2 unconfirmed destroyed, 3 probables and 11 damaged enemy aircraft.

Share
Posted in All, The Dowding System | Leave a comment

Battle of Britain Hall

I went to England to pay attention to the celebration of 75 years since the Battle of Britain so of course the highlight of the visit to RAF Museum in Hendon was the “Battle of Britain Hall”.

BoB_01

The Gloster Gladiator was the first enclosed cockpit and last biplane fighter introduced into RAF service. At the outbreak of WWII, two RAF fighter squadrons were sent to France. In just ten days of hard fighting, all the aircraft had been lost. The Gladiator was involved in a number of famous actions abroad during the early war years; operations from a frozen lake in Norway, defence of Malta, and early operations in Greece and North Africa.

BoB_02

This is the last surviving Boulton Paul Defiant. Initially it had some success since Germans mistook it for a Hurricane or Spitfire and attacked into a massive firepower from the rear turret. The Germans learned their lesson and after a period with severe losses the type was withdrawn from daytime duties.BoB_03

After the fighting in France was over the Bristol Blenheim was used in day and night attacks against German occupied ports and installations in frantic attempts to disrupt their invasion plans. BoB_04

Keith Park was a New Zealander put in command of the 11 Group Fighter Command. He has been called “Defender of London 1940”. To his left are the RAF defending units and to the right the German units that took part in the Battle of Britain.BoB_05

The British radar system played a vital role in the battle.BoB_06

This is a Spitfire Mk I. The Spitfire was the only British fighter capable of meeting the Messerschmitt Bf109E on equal terms.BoB_07

This is a Hawker Hurricane Mk I. The Hurricane played a vital role in hectic battles during the summer of 1940. Hurricanes destroyed more enemy aircraft during the Battle of Britain than did all the other air and ground defences combined. BoB_08

The Heinkel 111 was designed in 1934 and was ageing and inadequate in the Battle of Britain. It was vulnerable to fighter attack, being too slow to take effective avoiding action and too poorly armed to defend itself.
BoB_09

The Messerschmitt Bf109 remained the backbone of the Luftwaffe fighter forces throughout World War Two. The Bf109E was as fast as the Spitfire, faster than the Hurricane but could out-climb both. Its worst handicap, during the Battle of Britain, was however its limited fuel capacity.
BoB_10

The Junkers Ju88 began life as a bomber, became a night fighter and intruder; undertook anti-shipping operations and flew long-range reconnaissance missions. It is one of the truly great multi-role combat aircraft.
BoB_11

The Bf110 was designed as a long range escort fighter but later converted into a night fighter and proved to be one of the most successful put into service during World War Two.BoB_12

The Junkers Ju87 “Stuka”  was used to attack shipping in the Channel and went on to sink more ships than any other aircraft in history. ‘Stuka’ units then turned their attention to coastal airfields and radar stations, but by August 1940 suffered heavy losses from defending fighters.

BoB_13

There are more than aircraft in the Battle of Britain Hall, like pilot uniforms…BoB_14

…paintings…BoB_15

…and this operations room.BoB_16

The huge Short Sunderland served throughout the war. Its design was so good that it remained in front line service for over twenty years and it became the last flying-boat operated by the Royal Air Force.BoB_17

As a visitor to the museum you can enter the Sunderland to explore it properly.

The RAF Museum in Hendon is fantastic. Visit it next time you are in London!

Share
Posted in All, RAF Museum Hendon | Leave a comment

Grahame White Factory

Claude Grahame-White was one of the first to qualify as a pilot in England. He received licence No 6 in 1910. In 1911 he established a flying school at Hendon aerodrome.  A few years ago an original World War I Grahame-White aircraft factory hangar was relocated to Hendon  and today it houses the museum’s World War I collection – the Grahame White Factory.

GWF_01

Picture above is from another WWI factory, with the assembly of…GWF_02

…the famous trainer Avro 504K. More than 8,000 were built during the war!GWF_03

Introduced as a two-seat fighter on the Western Front in late 1915 the Royal Aircraft Factory F.E. 2b was soon outperformed by German fighter aircraft and transferred to night-time duties, which explains the paint-scheme on this aircraft. GWF_04

The condition of many of the aircraft here is remarkable. This is however a flyable replica built in New Zealand using a few original parts of…

GWF_05

…the Royal Aircraft Factory R.E.8. It was the RFC/RAF’s most widely used type of Corps reconnaissance aircraft from 1917.GWF_06

This Albatros D.Va is also a flyable replica aircraft  built in New Zealand in 2011, using an original contemporary Mercedes D.III engine from RAF Museum stocks.GWF_07

This poster is warning of “the hun in the sun” and shows an Albatros attacking a Bristol Fighter. The museum…GWF_08

…provides its visitors with an opportunity to get a good view of the working conditions for the crew of a Bristol Fighter.
GWF_09

The Bristol F.2b Fighter was used for offensive patrols, photographic reconnaissance, escort fighting and ground attacks.GWF_10

The Sopwith Camel was the highest scoring fighter of World War One, “so famous the Arabs named an animal after it”. Nicknamed “The King of the Air Fighters” this was the WWI equivalent to the the Spitfire in WWII.GWF_11

I find the quote and facts above moving. Albert Ball had shot down 44 aircraft when he died at the age of 20. War is terrible…GWF_12

The Fokker D.VII is considered to be one of the outstanding fighters of World War One. It was so successful that it was the only aircraft to be singled out by the Allied Powers in the Armistice Agreement section which detailed war material to be handed over: “In erster Linie alle Apparate D.VII (especially all first line D.VII aircraft)”. GWF_13

The Sopwith Dolphin’s unusual wing layout with its ‘backwards stagger’ was designed to provide the pilot with excellent all round visibility. It was also the world’s first single seat multi-gun fighter as it entered service in February 1918.

Share
Posted in All, RAF Museum Hendon | Leave a comment

Bomber Hall

I continue my visit to the RAF Museum in Hendon, London. Bordering to the Historic Hangars is another set of hangars, housing the “Bomber Hall”.

BH_01

The Fairey Battle was introduced in 1937 but lack of speed and defensive armament made it obsolescent when the war began. Due to the lack of more modern types it however remained in front line service and was the first aircraft sent to France at the outbreak of war.BH_02

This Handley Page Halifax bomber was one of the aircraft attacking Tirpitz in April 1942. At an altitude of 60 m above water ready to drop four 450 kg mines it was hit by German anti-aircraft gunners.BH_03

This Halifax was found in water 1971 and brought to the surface the year after. It has been decided to keep it this way with the exception of one engine that has been restored.BH_04

Well, this is the “Bomber Hall”…

BH_05

Bomber Command suffered the highest casualty rate of any branch of the British services in World War Two and the average age of the seven-man crew in an Avro Lancaster was only 22 years.  This is an impressive aircraft made in great numbers.  Six major companies built 7377 aircraft at ten factories on two continents.BH_06

The B24 Liberator was built in greater numbers than any other US military aircraft. In India it remained in service until 1968. To the right is a Percival Prentice trainer.
BH_07

This is an office with a view…BH_08

…but also a very demanding place to work; the Boeing B17G Fortress. A total of 12,731 Fortresses were manufactured of which just over two-hundred were supplied to the RAF.BH_09

This is a Messerschmitt BF109G-2. More than 33000 190’s were built and it is a legend among the WWII fighters.BH_10

The Focke Wulf Fw 190 was one of the most successful combat aircraft of World War Two. This example was originally a one-seat fighter but modified as a two-seat aircraft.
BH_11

The Heinkel He162 was designed as a cheap jet fighter capable of being flown by almost anyone but it came too late to have any effect on the outcome of the war. BH_12

The Vulcan was the second of the Royal Air Force’s ‘V bombers’ and provided part of Great Britain’s nuclear deterrent force. The last Vulcans retired from operational service in 1984 and the last Vulcan flying will make its last flight this year.

Share
Posted in All, RAF Museum Hendon | Leave a comment

Historic Hangars

The RAF Museum houses a few beautiful old hangars that were once part of the old Hendon Aerodrome. Today they are perfect for storing historic aircraft!

HH_01

Curtiss Kittyhawk – more than 3 000 Kittyhawks were delivered to Commonwealth Air Forces and provided the RAF with valuable reinforcements in the Middle East at a time when British resources were overstretched.

HH_02

The Hawker Hart Trainer was developed from the bomber variant as an advanced trainer for the RAF.

HH_03

The Bristol Bulldog was the standard Royal Air Force fighter in the 1930’s, equipping ten of its thirteen home defence Squadrons. This example crashed in an air show in 1964 and what you can see today is the resent result of one of the most complete restoration programmes yet attempted by the RAF Museum.

HH_04

The de Havilland DH9A was produced in 1918. It saw limited service in World War One but became the backbone of the Royal Air Force’s post-war colonial bombing force.

HH_05

You see the tails of a Panavia Tornado and a McDonnell Douglas Phantom. In front of them from left is first a Sopwith Snipe, successor to the immortal Camel. Over 2 000 were built but since the war ended many went into storage, never to enter service. In the middle is what remains of a Gloster Gladiator that was one in a Squadron sent to Norway following the German invasion and fought during April, May and June 1940. Finally the Bulldog mentioned above.
HH_06

This is a section of a Supermarine Southampton flying boat from 1925. This example was converted into a houseboat in the early 1930’s but rescued in 1967 by the RAF Museum. Restoration commenced in 1984 and lasted for eleven years with an amazing result.HH_07

A Bristol Beaufort torpedo bomber. This example is built up using parts found in the jungles of New Guinea. HH_08

The very last version of the Spitfire was this – the F24. It has the powerful Griffon engine and a top speed of 730 km/h.HH_09

The BAC Lightning was the Royal Air Force’s first truly supersonic aircraft. The first operational squadron received its aircraft in 1960.

Share
Posted in All, RAF Museum Hendon | Leave a comment

Milestones of Flight

The “Milestones of Flight” building is huge and along one wall is…

MoF_01

…a tmeline of Milestones of Flight. MoF_02

The hall itself is filled with “Milestone Aircraft”…MoF_03

…like the Bleriot XI, one of the first dependable, reliable and versatile monoplanes at a time when many of its contemporaries were dangerous, difficult to control and unstable.MoF_04

The aircraft shown is similar to the one that crossed the English Channel in 1909 and look closely – there is Louis Blériot!MoF_05

Here is the Percival Mew Gull that won the Folkestone Aero Trophy in 1937.  The Percival Mew Gull is to this day the class holder of the world record time between London – Cape Town – London.MoF_06

Imagine sitting in this cockpit flying London – Cape Town – London!MoF_07

Above is the beautiful Hawker Hart II. Although designed as a bomber it had a performance superior to any fighter aircraft then in existence.MoF_08

The de Havilland Mosquito was made largely of wood and designed as an unarmed bomber, depending on its superior speed to escape enemy fighters.

MoF_09

The Messerschmitt Me262 was the only jet fighter to see air-to-air combat in World War Two.

MoF_10

The latest Milestone Aircraft in this hall is the Eurofighter Typhoon, thought to represent the future with its cutting edge technology.

Share
Posted in All, RAF Museum Hendon | Leave a comment

Royal Air Force Museum in Hendon, London

M01A short distance north of London City you once found Hendon’s London Aerodrome in Colindale. Today this is the site of Royal Air Force North London Museum. It was opened by her Majesty the Queen 15th November 1972.

M02

Admission is free! As we arrived we were met by a display of Second World War, vehicles…

M03

…tents, equipment and staff in contemporary uniforms. M05

There was also this engine…

M04

…producing the most wonderful sound;

There is so much to explore here. One example is an exhibition of art, including…

M06

…this watercolor by Captain William Earl Johns (the author of the Biggles books) painted in 1920 and capturing his unit – 55 Squadron – on a bombing target.

M07

I also found this collection of “souvenirs” from Richthofen’s shot down Fokker.M08

But most of all this is a fantastic museum of aeroplanes and I will be back with more posts from RAF Hendon’s halls and hangars:

  • Milestones of Flight
  • Historic Hangars
  • Bomber Hall
  • Graham White Factory (WWI)
  • Battle of Britain Hall
Share
Posted in All, RAF Museum Hendon | Leave a comment