science

Schweizer X-26 Frigate

Schweizer X-26 Frigate is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Schweizer X-26 Frigate rather than just read about it. In short: 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.

Key takeaways

Schweizer X-26 Frigate belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Schweizer X-26 Frigate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Schweizer X-26 Frigate from memory before moving on to harder problems.

Reference excerpt

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

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 m2) 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/m2) 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 m2) 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

Illustrations

Worked examples

Example 1 — a first encounter with Schweizer X-26 Frigate

Start with the simplest possible case. Write down what Schweizer X-26 Frigate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Schweizer X-26 Frigate before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Schweizer X-26 Frigate ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Schweizer X-26 Frigate

In research: Schweizer X-26 Frigate appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Schweizer X-26 Frigate in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Schweizer X-26 Frigate is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1960s United States experimental aircraft, 1960s United States military reconnaissance aircraft, 1960s United States sailplanes, so understanding it makes those chapters shorter.
In everyday life: Look for Schweizer X-26 Frigate outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Schweizer X-26 Frigate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Schweizer X-26 Frigate means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Schweizer X-26 Frigate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Schweizer X-26 Frigate in simple terms?

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.

Why does Schweizer X-26 Frigate matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Schweizer X-26 Frigate?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Schweizer X-26 Frigate.