Marske XM-1

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XM-1
Marske XM-1 N5823N.jpg
The XM-1 in its original configuration with tip rudders
Role Glider
National origin United States
Designer
First flight 1957
Status Sole example no longer on FAA registry
Number built one

The Marske XM-1 was an American mid-wing, single-seat, experimental tailless glider that was designed and built by in 1957.[1][2][3][4]

Experimentation with the XM-1 lead to the final configuration of the later Marske Pioneer.[1]

Design and development[]

The first of Marske's flying wings was the XM-1, a design inspired by the flying wing designs of Charles Fauvel and Al Backstrom. He built the XM-1 when he was 19 years old. The aircraft went through several versions, each a modification of the same basic airframe as Marske experimented with configurations. The aircraft started off with fins on the wing tips and was later converted to a single fin at the rear of the short fuselage in its "XM-1D" configuration.[1][4]

The XM-1 was built with a welded steel tube fuselage covered in fiberglass. The 40 ft (12.2 m) wing was fabricated from wood and covered with doped aircraft fabric. The wing employed a 14% Fauvel airfoil. The landing gear was a fixed monowheel.[1]

Only one XM-1 was built. It was registered with the US Federal Aviation Administration in the Experimental - Amateur-built category.[1][2]

Operational history[]

The XM-1 was described by Soaring Magazine as "easy to fly". The aircraft was stall and spin proof. Marske sold the aircraft and it went through a series of owners. The XM-1 was later removed from the FAA register and likely no longer exists.[1][2]

Variants[]

The XM-1 in its "D" configuration with the single central fin and rudder
XM-1-A
Initial configuration with wing tip fins and rudders.[1]
XM-1-B
with minor improvements over the XM-1-A
XM-1-C
Modified with a central fin only.
XM-1D
Final configuration with a central fin and rudder.[1]

Specifications (XM-1B)[]

Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[5]

General characteristics

  • Crew: one
  • Length: 8 ft 2 in (2.48 m)
  • Wingspan: 38 ft 1 in (11.6 m)
  • Height: 3 ft 10 in (1.16 m) at cockpit
  • Wing area: 160 sq ft (15 m2)
  • Aspect ratio: 9
  • Airfoil: 14% Fauvel
  • Empty weight: 311 lb (141 kg)
  • Gross weight: 551 lb (250 kg)

Performance

  • Never exceed speed: 140 mph (226 km/h, 122 kn)
  • Aerotow speed: 104.5 mph (90.8 kn; 168.2 km/h)
  • Winch launch speed: 105 km/h (65.2 mph; 56.7 kn)
  • g limits: +4 -3 at 65.25 mph (56.7 kn; 105.0 km/h)
  • Maximum glide ratio: 24:1 at 51 mph (44.3 kn; 82.1 km/h)
  • Rate of sink: 175 ft/min (0.89 m/s) at 39.8 mph (34.6 kn; 64.1 km/h)
  • Wing loading: 3.4 lb/sq ft (16.7 kg/m2)

See also[]

Related lists

References[]

  1. ^ Jump up to: a b c d e f g h Rogers, Bennett (August 1974). "1974 Sailplane Directory, Soaring Magazine". Soaring Magazine. Soaring Society of America: 96.
  2. ^ Jump up to: a b c Federal Aviation Administration (August 2011). "Make / Model Inquiry Results". Retrieved 6 August 2011.
  3. ^ Marske, Jim (n.d.). "The Flying Wings of Jim Marske". Archived from the original on 31 December 2005. Retrieved 20 March 2011.
  4. ^ Jump up to: a b Marske, Jim (n.d.). "About Jim Marske". Archived from the original on 27 November 2010. Retrieved 20 March 2011.
  5. ^ Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 226–227.
  • Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 226–227.
  • Rogers, Bennett (August 1974). "1974 Sailplane Directory, Soaring Magazine". Soaring Magazine. Soaring Society of America: 96.
  • Federal Aviation Administration (August 2011). "Make / Model Inquiry Results". Retrieved 6 August 2011.
  • Marske, Jim (n.d.). "The Flying Wings of Jim Marske". Archived from the original on 31 December 2005. Retrieved 20 March 2011.
  • Marske, Jim (n.d.). "About Jim Marske". Archived from the original on 27 November 2010. Retrieved 20 March 2011.

External links[]

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