Schweizer SGS 1-29

SGS 1-29
Paul Schweizer's 1-29 at the 1963 US Soaring Championships at Harris Hill, Elmira, NY
Role Experimental Standard-class sailplane
National origin United States
Manufacturer Schweizer Aircraft Corporation
Designer Ernest Schweizer[1]
First flight 1958[2]
Number built 1


The Schweizer SGS 1-29 is an American single-seat, mid-wing, experimental laminar flow airfoil glider built by Schweizer Aircraft of Elmira, New York.[3]

The 1-29 is a development of the Schweizer SGS 1-23 that utilizes a 1-23 fuselage and a newly constructed set of 49.2 foot (15.0 m) span wings.[1][3]

The aircraft was constructed to study the feasibility of producing improved boundary layer laminar flow on a metal-winged sailplane. Only one SGS 1-29 was produced and the project was not pursued further.[1][2][3]

Background

In the mid-1950s the SGS 1-23 was in full production and through successive models was performing very well in competition. By 1957 the development of fiberglass-reinforced plastic had an impact on the production of many sporting goods, such as boats and fishing rods. Schweizer Aircraft thought it was only a matter of time before a fiberglass sailplane was produced. This concern was borne out in 1965, when two German fiberglass sailplanes were entered in the world championships.[2]

Schweizer Aircraft evaluated the use of fiberglass for sailplane construction and rejected it for several reasons:[2]

The company decided to concentrate on getting the best performance from the material that it knew best, aluminum.[2]

Schweizer created several design studies of new sailplanes in the mid-1950s. These included:[2][4]

Of these, only the SGS 1-29 proceeded to prototype stage.[2][3]

Design and development

The 1-29 was constructed using a modified SGS 1-23G fuselage. New wings were built for the aircraft to determine if better laminar flow could be achieved on a metal wing.[1][3]

The wings were all-metal and of constant chord. The wing ribs were identical and created from a single master die to ensure uniformity. The wing features a thick, deep spar to reduce wing flexing and "oil-canning" that might interrupt laminar flow. The wing was assembled using flush rivets and has balanced top and bottom dive brakes.[1][3]

The aircraft first flew in 1958 and flight testing was reported by Schweizer Aircraft as on-going though 1959.[2]

The 1-29 program did yield positive results. The standard production model SGS 1-23H-15 with the same fuselage and wingspan as the 1-29 and a NACA 43012A airfoil, produced a best glide ratio of 29:1. With its laminar flow wing and NACA 63-618 airfoil the 1-29 recorded a 34:1 glide ratio, an improvement of 15%.[3]

The 1-29 design was never certified and the sole aircraft that was built is an experimental aircraft in the "racing, exhibition" class and registered as N3898A.[3][5]

Operational history

The 1-29 was flown in at least three US national competitions by Paul A Schweizer, Bill Ivans and Tom Smith.[3]

Aircraft on display

Once the 1-29 test program was complete, the aircraft was donated to the National Soaring Museum where it is currently listed as being in storage.[6]

Specifications

General characteristics

Performance

See also


Related lists

References

  1. 1 2 3 4 5 Activate Media (2006). "SGS 1-29 Schweizer". Retrieved 2008-05-27.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Schweizer, Paul A: Wings Like Eagles, The Story of Soaring in the United States, pages 159-209. Smithsonian Institution Press, 1988. ISBN 0-87474-828-3
  3. 1 2 3 4 5 6 7 8 9 Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 32. Soaring Society of America, November 1983. USPS 499-920
  4. 1 2 3 4 Smithsonian Institution (2004). "Directory of Airplanes". Retrieved 2008-05-13.
  5. ↑ Federal Aviation Administration (May 2008). "FAA Registry". Retrieved 2008-05-27.
  6. ↑ Munson, J. (n.d.). "Sailplanes in Our Collection". Retrieved 2008-04-15.

External links

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