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X-plane programs

X-26 Frigate
An X-26A sailplane on display at the 1984 NAS Patuxent River Air Show
General information
Type	Research and training aircraft
National origin	United States
Manufacturer	Schweizer
Designer	Ernie and William Schweizer
Primary user	United States Navy
Number built	7?
History
First flight	July 1967
Developed from	Schweizer SGS 2-32

The X-26 Frigate is the longest-lived of the X-plane programs. The program included the X-26A Frigate sailplane and the motorized X-26B Quiet Thruster versions: QT-2, QT-2PC, and QT-2PCII. All were based on the Schweizer SGS 2-32 sailplane.

Development

The X-26A was used by the United States Navy to train test pilots in the condition of yaw/roll coupling. Since jet trainers were known to be dangerous in this condition, the X-26 was based on the Schweizer SGS 2-32 sailplane. Sailplanes react much slower and are easier to control than jet aircraft, making the X-26 a much safer training platform. Four aircraft were originally ordered. Three of the original planes crashed. The Navy purchased a replacement for each of the crashed units.

Operational history

Two Schweizer 2-32s, 67-15345 and 67-15346, from the U.S. Naval Test Pilot School X-26 Program, were modified to QT-2 configuration (QT for Quiet Thruster) by the Lockheed Missiles & Space Company and civil registered as N2471W and N2472W. In 1967 the aircraft were modified by adding a Continental O-200 engine, V-Belt RPM reduction system, four-bladed Fahlin fixed pitch wooden propeller, and associated airframe upgrades.

After demonstrating quiet flight, the aircraft were again modified to military QT-2PC configuration, known only as Tail Numbers "1" and "2", with avionics and camouflage for night operation. They were successfully evaluated in Southeast Asia under the Prize Crew OpEval program for covert ("stealthy") tactical airborne observation in the spring of 1968 (during Têt). The two QT-2PCs were returned to the Test Pilot School in 1969 and re-designated X-26Bs.

The #1 QT-2PC was re-designated "67-15345" and the #2 aircraft was used for spare parts. The original X-26 glider version was then designated X-26A.

Lockheed continued the covert airborne surveillance program with one Q-Star (House Test Aircraft) and eleven pre-production YO-3As.

Surviving aircraft

QT-2PC, QT-2PCII, and X-26B
QT-2PC #1 in the Soc Trang, RVN Army Airfield Hangar in 1968
General information
Type	Experimental Covert Reconnaissance Aircraft
National origin	United States
Manufacturer	SACUSA and LMSC
Designer	2-32: Bill and Ernie Schweizer QT-2 and its variants: Stanley Hall
Status	1: Unknown. #2 Operational as a glider at Mile High Gliding
Primary user	Tri-Service (USA, USAF, USN, and USMC)
Number built	2 (QT-2 & QT-2PC/X-26B)
History
Introduction date	1967
First flight	QT-2: July, 1967, QT-2PC: Dec, 1967
Retired	1969 as X-26B
Developed from	SGS 2-32

Both of the aircraft from the original QT-2 / X-26B program survive today. The X-26B aircraft known as QT-2 N2471W and QT-2PC #1 is located (as of 2019) in the collection of the US Army Aviation Museum at Ft. Rucker AL. The original N number N2471W was reassigned in 2019 to another Schweizer SGS 2-32 glider, (serial #7, formerly N2758Z) owned by Mile High Gliding of Boulder Colorado.

The second X-26B aircraft known as QT-2 N2472W and QT-2PC #2 was restored to SGS 2-32 configuration and has been operated for many years (and known as "72 Whiskey") for paid scenic rides at Mile High Gliding in Boulder, Colorado.

The Q-Star was the first aircraft to use a rotary combustion chamber (Wankel) engine. It is currently being returned to flight status.

The YO-3As were tactically evaluated in Southeast Asia from mid-1969 to late 1971. They were later used by the Louisiana Dept of Wildlife & Fisheries (LDWF) and the Federal Bureau of Investigation (FBI) in law enforcement, and by NASA for scientific applications.

YO-3A 69-18005 is on display at the Museum of Flight in Seattle, Washington. YO-3A 69-18006 is on display at the Pima Air and Space, Tucson AZ. YO-3A 69-18007 is in storage at the Western Museum of Flight in Torrance, California. As of 2014, YO-3A 69-18010 (NASA 818) is in flyable storage at Armstrong Flight Research Center.

Accidents

U.S. Navy 157932 crashed March 1971, pilot killed.
U.S. Navy 157933 crashed May 18, 1972, pilot killed.

Specifications (X-26A Frigate)

General characteristics

Crew: two
Length: 26 ft 9 in (7.92 m)
Wingspan: 57 ft 1.5 in (17.37 m)
Height: 9 ft 3 in (2.74 m)
Wing area: 180 sq ft (16.7 m)
Empty weight: 857 lb (389 kg)
Gross weight: 1,430 lb (650 kg)
Wing aspect ratio: 18

Performance

Maximum speed: 158 mph (254 km/h, 137 kn)
Wing loading: 7.9 lb/sq ft (39 kg/m)
Power/mass: 0.07 hp/lb (0.12 kW/kg)
Rate of sink: 0.6 m/s (120 ft/min)

Specifications (X-26B and QT-2PC)

General characteristics

Crew: two
Length: 30 ft 9 in (9.33 m)
Wingspan: 57 ft 1.5 in (17.37 m)
Height: 9 ft 3 in (2.74 m)
Wing area: 185 sq ft (16.7 m)
Gross weight: 2,500 lb (1,134 kg)
Propeller: Ole Fahlin four-blade, 8 inch chord, fixed-pitch 100 inch diameter
Wing aspect ratio: 18
Fuel Capacity: 20 gallons (nominal)
Powerplant: 1 × Continental O-200 horizontally opposed 4-cylinder air-cooled engine, 100 hp (75 kW)

Performance

Service ceiling: 13,000 ft (4,000 m)
Rate of climb: 200 ft/min (1.0 m/s)
Power/mass: hp/lb (kW/kg)
Flight endurance: Planned = 4+ hours; demonstrated = 6.7+ hours
Quiet cruise speed: 70 - 80 mph

Notes

Freeman, Paul. "San Luis Obispo area". www.airfields-freeman.com. Archived from the original on July 1, 2014.
www.milehighgliding.com
^ "US Navy and US Marine Corps BuNos". Retrieved August 6, 2014.

References

American X-Vehicles (.pdf)

This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.

External links

X-26A Frigate (Schweizer SGS 2-32) / X-26B (Lockheed) at GlobalSecurity.org
Lockheed’s Combined Sailplane & Slow-Turning Propeller at HistoryNet.com
QT-2PC PRIZE CREW

v t e Schweizer Aircraft
Sailplanes & Gliders	1-1 1-2 1-3 1-6 1-7 2-8 9-10 15-11 2-12 6-14 1-15 1-16 1-17 2-18 1-19 1-20 1-21 2-22 1-23 1-24 2-25 1-26 2-27 7-28 1-29 1-30 2-31 2-32 2-33 1-34 1-35 1-36 2-37 2-38 X-26 Frigate
Agricultural Aircraft	Ag Cat Ag Cat Super B
Amphibious Aircraft	TSC-1 Teal
Helicopters	300 330 333 S-434
Reconnaissance Aircraft	QT-2 SA 2-37 RU-38 Twin Condor
UAVs	MQ-8 Fire Scout
People	Ernest Schweizer Paul A Schweizer William (Bill) Schweizer

USAF / Joint Service experimental aircraft (X-plane) designations since 1941

Supersonic/special test
"S" (1946–1947)

Experimental
"X" (1948–present)

1–25	X-1 X-2 X-3 X-4 X-5 X-6 X-7 X-8 X-9 X-10 X-11 X-12 X-13 X-14 X-15 X-16 X-17 X-18 X-19 X-20 X-21 X-22 X-23 X-24 X-24C X-25
26–50	X-26 X-27 X-28 X-29 X-30 X-31 X-32 X-33 X-34 X-35 X-36 X-37 X-38 X-39 X-40 X-41 X-42 X-43 X-44 X-44 MANTA X-44 (UAV) X-45 X-46 X-47 X-47B X-48 X-49 X-50
51–	X-51 X-52 X-53 X-54 X-55 X-56 X-57 X-58 X-59 X-60 X-61 X-62 X-63 X-64 X-65 X-66