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Windward Performance Perlan II

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First flight
  
23 September 2015

Status
  
Under development

Unit cost
  
$1.4 to $2 Million U.S

National origin
  
United States

Designer
  
Greg Cole

Windward Performance Perlan II httpsuploadwikimediaorgwikipediacommons44

The Windward Performance Perlan II (English: Pearl) is an American mid-wing, two-seats-in-tandem, pressurized, experimental research glider that was designed by Greg Cole and built by Windward Performance for the Perlan Project.

Contents

Windward Performance Perlan II Perlan 2 Glider Aims For Record Altitude Airbus Technology

The aircraft first flew on 23 September 2015 at Redmond Municipal Airport, Oregon.

Design and development

Windward Performance Perlan II Perlan Project Gets Good Press in the New York Times Sustainable Skies

The Perlan II is a follow-up design to the successful Perlan I and has as its design goal a flight exceeding 90,000 ft (27 km) in altitude. The project's goals include science, engineering and education. The aircraft will be used to study the polar vortex and its influence on global weather patterns. The program also hopes to beat the 85,069 ft altitude record set in 1975 by a SR-71.

Windward Performance Perlan II UAV to Climb to 90000 ft Without an Engine UAS VISION

The aircraft is made from composites. Its 83.83 ft (25.55 m) span wing has a high aspect ratio of 27:1 and is equipped with airbrakes. The pressurization system produces an 8.5 psi differential, although the two-person crew will wear pressure suits for safety. The landing gear is a retractable monowheel gear. Because the aircraft will operate at extreme altitudes, in only 3% of sea level atmospheric pressure, it will also be flying at true airspeeds in excess of 0.5 Mach. The aircraft was designed to minimize flutter and manage shock wave formation.

The original funding for the Perlan Project was provided by Steve Fossett and he flew the Perlan I, along with test pilot Einar Enevoldson to a glider altitude record of 50,761 ft (15 km) in the mountain waves of El Calafate, Argentina on 30 August 2006. Fossett was killed in a light aircraft crash a year later and the project floundered without funding. Since then more than US$2.8M has been raised to build the Perlan II, including a donation from Dennis Tito. In November 2013, a crowd-funding effort was undertaken. In August 2014 Airbus became a partner in the project.

The Perlan II was originally expected to fly in early 2013 and will start with some flights in the US Sierra Nevada mountain wave. The record setting and research flights are intended to start in southern Argentina in April 2016, by Einar Envoldson or Perrenod using rebreather oxygen systems. The aircraft was displayed at AirVenture in July 2015. First flown in September 2015, research flights to 100,000 ft (30,480 m) are expected to start in 2019.

Specifications (Perlan II)

Data from FreeFlight

General characteristics

  • Crew: two
  • Length: 33.33 ft (10.16 m)
  • Wingspan: 83.83 ft (25.55 m)
  • Height: 7.25 ft (2.21 m)
  • Wing area: 263 sq ft (24.4 m2)
  • Aspect ratio: 27:1
  • Gross weight: 1,800 lb (816 kg)

    • Performance

  • Never exceed speed: 377 kn (434 mph; 698 km/h) 377 true airspeed, 56kts indicated
  • Service ceiling: 90,000 ft (27,000 m)
  • g limits: +6/-4

    • Windward Performance Perlan II Sailplane to the Stratosphere Flight Today Air Space Magazine

    References

    Windward Performance Perlan II Wikipedia
    (Text) CC BY-SA