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Miles M100 - Student

The Miles M.100 Student was built as a lightweight trainer as a private venture by F.G. and George Miles with development started in 1953. Although not specifically a Miles product, it was promoted as a Royal Air Force trainer but failed to enter production.

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M.100 shortly after completion, with the B Condition indentity G-35-4 on its fins.
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M.100 at Farnborough 1957. Indentity is always G-35-4. Wing tips tanks had been removed. Note the fences along the top of the fuselage (Photo Hugh Butler, RAF Flying review)

F.G and and George Miles conceived the idea of a new low cost military jet trainer in 1953, when still working on conversion of the M.77 Sparrowjet.

In designing the M.100 the two brothers and their small team set out to produce an aircraft to do the same job as the Jet Provost for ab initio and flying instruction, but in a generally smaller design, to minimise acquisition and operatings costs. 

With its accent on economy, the M.100 was designed round a single Marboré IIA turbojet of only 880lb thrust for take-off, or little more than half the output of the initial Jet Provost's 1640lb Viper ASV.5.

With about half the take-off weight of the Jet Provost T.3, however, the Student was not too far off in its overall performance. Maximum level speeds were just under 300 mph and 330 mph, respectively.

It was May 14, 1957 that the prototype, wearing the B conditions marking G-35-4, made its first flight in hand of George Miles, its chief designer, at Shoreham.

An uneventful although comprehensive flight development programme over the next few months, motsly by F.G. Miles Ltd test pilot ex-Sqn Ldr Duncan McIntosh, necessited non significant changes, and allowed the Student's inclusion in the Farnborough programme in September 1957.

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Miles M100 Student in 1958, with its civil identity G-APLK. Source : Aeroplane monthly, december 1997
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Entry air view of the NACA flush air intake and fences for containing the spilled boundary-layer vortices (Coloried Photo, Air pictorial 1958)
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Dorsal intake evolution

One of the main design features was the NACA-type flush intake above the wing centre-section for the Marboré centrifugal turbojet (for wich Blackburn had a production licence).

This intake's location and shape minimised the possibilities of foreign object ingestion on the ground and in the air, at the expense of some loss in installed thrust. It certainly appeared to work well enough in most flight conditions.

However, to prevent overspill at high angles of attack,  fences had been added each side after the first flight, 

Characteristics

Dimensions

Span29.2ft.(8.90m)
Length30.9ft(9.38m)
Height6.3ft(1.90m)

Weights and loadings

Empty, equipped2300lb.(1043kg)
Weight loaded3100lb.(1406kg)
Max loaded3600lb.(1630kg)
Max.wing loading26lb/sq.ft.(127kg/m²)

Performances ( at 3100 lb)

Max speed at S/L290mph(467km/h)
Max speed at 20000 ft.302mph(486km/h)
Cruising speed at S/L254mph(409km/h)
Cruising speed at 20000 ft..268mph(431km/h)
Landing speed 69mph(111km/h)
Rate of climb at S/L2050ft./mn(650m/mn)
Time to 10 000 ft5.7mn
Time to 20 000 ft14mn
Take-off distance (50 ft)1740ft.(530m)
Landing distance (50 ft)1710ft.(520m)
Range476miles(767km)

Mark 2 Version

Early in 1964, the prototype Student was modified to the Mk. 2 version, incorporating a Marbore VI F turbojet giving 20 per cent greater thrust, interchangeable underwing pods for a variety of weapons, improved brakes and cockpit ventilation. In this guise, basic production price was £25,000. 

It was flight tested by George Miles on 22 April, 1964.

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Miles M100 Student Mark 2. Source Flight Archives
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The Miles Student (above) was wearing British Service markings while engaged in manufacturer's armament trials at Boscombe Down, Wiltshire (Source Flight archives 1964)
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The Miles Student, after being delivered to HSA, Hatfield for noise research. Source photo : Philippe Bezard's collection
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Miles M100 Student G-APLK inside the Loganair hangar at Glasgow airport on August 3rd, 1976. With courtesy of Peter de Zeeuw
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Miles M.100 Student G-APLK, Glasgow Airport. Summer 1983. Source : with courtesy of Paul Thallon
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Miles M100 inside the Loganair hangar at Glasgow. With courtesy of the photograph Peter de Zeeuw (NL)

G-MIOO

In 1985, the original 1957 prototype Miles Student two-seat trainer has been renamed the GM100 (G-MIOO) after its designer, George Miles. Miles sold the unique aircraft to Mike Woodley, chairman of Aces High. It has been granted a UK Permit to Fly, and has updated avionics and a new paint scheme.

Woodley, claims that the trainer's low stall speed, around 55kt, is unique in its class, as is its excellent grassrunway capability. Aces High operated 20 aircraft for film work and air shows. 

Few weeks later, on August 24, 1985, the GM100 crashed at Duxford.  The aircraft was being flown by company chief pilot Peter Hoare.

Following an aerobatic sortie accompanied by former Miles Aircraft test pilot Duncan Macintosh, Hoare took off for a solo flight but abandoned take-off and landed heavily, coming to rest on the airfield. The aircraft sustained damage to the nose, and one wing was torn off.


Conservation in Museum of Berkshire aviation

The jet trainer, had been restorored to static display by a team of volunteers.

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G-MIOO, Miles M100 Student, Duxford, 1985. Source : with courtesy of the photographer Chris Young
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G-MIOO, Miles M100 Student, Duxford, June 1985. Source : Photographer William Allan, with courtesy of is son Geof
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