Schweizer SGU 2-22

The Schweizer SGU 2-22 is a United States two-seat, high-wing, strut-braced, training glider built by Schweizer Aircraft of Elmira, New York.Said, Bob: "1983 Sailplane Directory, Soaring Magazine", pages 26. Soaring Society of America, November 1983. USPS 499-920]

The 2-22 was designed to replace the two-place training gliders surplussed at the end of World War Two. Production was started in 1946 and it was produced until 1967, when it was superseded by an improved version, the SGS 2-33. From the 1940s until the 1960s it was the most numerous two-pace training glider in the USA. cite web|url = http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=320|title = SGU 2-22 Schweizer |accessdate = 2008-05-21|last = Activate Media|authorlink = |year = 2006]

Background

The end of World War Two resulted in a large number of military training gliders being sold as surplus. These included Frankfort TG-1s, Schweizer TG-2s and Schweizer TG-3s.

Most of the surplus gliders sold were not ideal trainers for ab initio civilian student flying, as they had high wing loadings and faster stall speeds. This made them suitable for aero-tow, but not for winch or auto-tow launches.

Furthermore many of these surplus two-place gliders had poor visibility from the rear seat where the instructor sat. Due to restrictions on the use of aluminum in training aircraft, many surplus gliders had wooden wings, making them unsuitable to be kept outdoors on tie-downs.

Schweizer Aircraft decided to design a two-place trainer that would address these deficiencies and provide a trainer that was easy to fly and would be easy for students to progress quickly on.

The new two-place was intended to be a complement to the single-place training glider then in production, the SGU 1-19.

Development

The SGU 2-22, indicating "Schweizer Glider, Utility, 2 Seats, Model 22", was designed by Ernest Schweizer. The aircraft was based on the SGU 1-7 single place glider of 1937. It used the 1-7's metal wing, single spar and single strut arrangement.

The prototype 2-22 was flown in March, 1946. To gain publicity for the new design company test pilot Frank Hurtt and company engineer Dick Powell used the prototype to set a new two-place duration record of 10 hours 9 minutes on April 10, 1946.

The 2-22 was produced in seven variants and remained in production for 21 years. Production was only curtailed when the Schweizer SGS 2-33 was put into production as a replacement. The 2-33 was essentially a refined 2-22, incorporating a longer semi-tapered wing.

The 2-22 received type certificate G-18 on 4 October 1946. cite web|url = http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/979408739f29dc26862573b4006eda10/$FILE/g-18.pdf|title = TYPE CERTIFICATE DATA SHEET NO. G-18|accessdate = 2008-05-21|last = Federal Aviation Administration|authorlink = |year = 2007|month = September]

The type certificate is currently held by K & L Soaring of Cayuta, New York who now provide all parts and support for the Schweizer line of sailplanes. cite web|url = http://klsoaring.com/|title = K & L Soaring, LLC|accessdate = 2008-04-05|last = K & L Soaring|authorlink = |year = undated]

A number of 2-22s were delivered as kits to the purchaser. These were accepted by the Federal Aviation Administration as certified aircraft and not amateur-builts, subject to conditions:

cquote|Each Model SGU 2-22C or SGU 2-22E glider assembled from a kit is designated Model SGU 2-22CK or SGU 2-22EK, respectively. These K models will be eligible for an airworthiness certificate when accompanied by an affidavit certifying that the glider is constructed in exact accordance with the approved drawings and manual, and that the parts and materials furnished by the manufacturer in the kit have been used; and further when the following inspections have been satisfactorily passed: (a) An inspection for workmanship, materials, and conformity before any covering is applied. (All woodwork may be sealed.)
(b) A final inspection of the completed glider.
(c) Check of flight characteristics.

Construction

The 2-22 has a welded steel tube fuselage covered in aircraft fabric. The single-spar, constant-chord aluminum structure wings feature spoilers on the top surface only and are covered in aircraft fabric. The tail surfaces are made from welded steel tube covered in aircraft fabric.

Variants

;SGU 2-22

:The original 2-22 is referred to as a "standard". It featured a 450 lb (204 kg) empty weight and an 830 lb (376 kg) gross weight. The aircraft had a windshield, but no canopy, rear windows or door. Fifty-one "standards" were built. The type was certified on 4 October 1946. ;SGU 2-22A

:The "A" model was a re-design to meet the requirements of the United States Air Force Academy. It incorporated a lengthened nose and a full canopy, along with a gross weight increase to 900 lbs (408 kg). It was certified on 24 May 1957. A total of three were completed.

;SGU 2-22B

:The "B" model was a "standard" with the gross weight increased to 900 lbs (408 kg). It was certified on 24 May 1957.

;SGU 2-22C

:The "C" model incorporated the changes from the "A" and "B" models and also introduced smaller ailerons. It was certified on 24 May 1957 and 103 were built.

;SGU 2-22CK

:The "CK" model was a "C" model completed by the buyer from a kit. Twenty-eight "CK" kits were completed.

;SGU 2-22E

:The "E" model was the last production model and incorporated larger spoilers, a bigger cockpit, a new-design canopy and changes to the wing root to allow a skylight to be fitted. The "E" was certified on 10 April 1963.

;SGU 2-22EK

:The "EK" was the kit version of the "E" model. The "EK" was certified on 7 February 1964.

Military Service

Aside from the 2-22As that were delivered to USAFA, later model 2-22s were also supplied to the USAF and a number were supplied as foreign aid to Indonesia.

Badge flights

Distance flying in the 2-22 is challenging, given its 17:1 glide ratio. One 2-22 was flown by Al Parker 200 miles (324 km) to complete a Gold distance and Diamond goal leg.

In service

In May 2008 there were still 123 SGU 2-22s registered in the USA. These included: [ cite web|url = http://registry.faa.gov/aircraftinquiry/acftinqSQL.asp?striptxt=SGU222&mfrtxt=Schweizer&cmndfind.x=17&cmndfind.y=16&cmndfind=submit&modeltxt=SGU+2-22|title = FAA Registry|accessdate = 2008-05-21|last = Federal Aviation Administration|authorlink = |year = 2008|month = May]

*2-22 - 19
*2-22A - 1
*2-22B - 0
*2-22C - 28
*2-22CK - 14
*2-22E - 55
*2-22EK - 6

pecifications

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wing area sqm=19.5
wing area sqft=210
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aspect ratio= 8.81
wing profile= NACA 43012A
empty weight kg=213
empty weight lb=470
gross weight kg=408
gross weight lb=900
lift kg=
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max speed kmh=144
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glide ratio= 17 at 47 mph (75 km/h)
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ee also

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* List of gliders

References

External links

* [http://www.soaraces.com/images/2-22.jpgPhotograph of a SGU 2-22]