Titan IIIB

Key takeaways

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

Reference excerpt

Titan IIIB was the collective name for a number of derivatives of the Titan II ICBM and Titan III launch vehicle, modified by the addition of an Agena upper stage. It consisted of five separate rockets. The Titan-3B Agena-D was a basic Titan IIIA with an Agena D upper stage. The Titan 23B was a basic Titan III with an Agena upper stage, and the Titan 24B was the same concept, but using the slightly enlarged Titan IIIM rocket as the base. The Titan 33B was a Titan 23B with the Agena (which had a smaller diameter than the Titan) enclosed in an enlarged fairing, in order to allow larger payloads to be launched. The final member of the Titan IIIB family was the Titan 34B which was a Titan 24B with the larger fairing used on the Titan 33B.

Features Part of the Titan rocket family, the Titan 23B space launch vehicle was a three-stage liquid fueled booster, designed to provide a small-to-medium weight class capability. It was able to lift approximately 3,000 kg (6,600 lb) into a polar low-Earth circular orbit. The first stage consisted of a ground ignited Aerojet LR-87 liquid propellant rocket, while the second stage consisted of an LR91 liquid propellant rocket. The third stage was an Agena D XLR81-BA-9 liquid propellant rocket. Various models of this Titan/Agena D rocket were called, "Titan-3B Agena-D", "Titan 23B", "Titan 24B", "Titan 33B" and "Titan 34B".

Background The Titan rocket family was established in October 1955, when the Air Force awarded The Martin Company a contract to build an intercontinental ballistic missile (ICBM). It became known as the Titan I, the nation's first two-stage ICBM and first underground silo-based ICBM. More than 140 Titan II ICBMs, once the vanguard of America's strategic deterrent force, were built. Titan IIs also were flown in NASA's Gemini crewed space program in the mid-1960s. The Titan 23B is a derivative of the Titan II vehicle with an Agena D upper stage added. The Titan IIIB family emerged when the new KH-8 (Gambit Mark 3) photo reconnaissance satellite was being developed as the successor to the KH-7 Gambit Mark 1/2 which began flying in 1963. It was decided to switch to the Titan family over the Atlas used for KH-7 because it had substantially more lift capability and also its conventional two-stage design and hypergolic propellants made for a simpler and more reliable launch vehicle than the quirky Atlas. The KH-8 was double the size of its predecessor but still well below the Titan's lift capability. While the KH-8 was the original raison d'être for the Titan IIIB's existence, as well as its primary payload, the booster was also used for Jumpseat SIGINT satellites and military comsats. It also lived up to its promise of greater reliability than the Thor and Atlas, with only a few failures over its run. Primary function: Launch vehicle used to lift medium class satellites into space:

Builder: The Martin Company Launch site: Vandenberg AFB, Calif. First stage: Length: 70 ft (21 m) Diameter: 10 feet (3.05 m) Engine thrust: 474,000 lbf (2,110 kN) vacuum Weight: 258,000 pounds (117,000 kg) Fueled Empty weight: 10,500 pounds (4,800 kg) Second stage: Length: 24 ft (7.3 m) Diameter: 10 ft (3.0 m) Engine Thrust: 100,000 lbf (440 kN) vacuum Weight: 64,000 pounds (29,000 kg) Fueled Empty weight: 6,100 pounds (2,800 kg) Third stage: Length: 24.8 ft (7.6 m) Diameter: 5 ft (1.5 m) Engine thrust: 16,000 lbf (71 kN) vacuum Weight: 7,160 kg (15,790 lb) – fueled Empty Weight: 2,300 pounds (1,000 kg) Guidance: Radio Subcontractor: GE Payload fairing: Diameter: 5 ft (1.5 m) Length: 20 to 25 ft (6.1 to 7.6 m) Skin and Stringer Construction – Tri-Sector Design Subcontractor: Boeing Date deployed: July 1966

Titan-3B Agena-D Titan-3B Agena-D used the same core and second stage as the Titan-IIIA, but added an Agena D upper stage. Twenty-two flights took place from SLC-4W at Vandenberg AFB between 1966 and 1969, all launching KH-8 satellites. Configuration:

First stage: 2 × LR-87-AJ9 Second stage: LR-91-AJ9 Third stage: Agena-D

Titan 23B

Titan 23B used the basic Titan-IIIA core (with an updated first and second stage engines) with an Agena D upper stage, though without the all-inertial guidance system, malfunction detection equipment, and redundant systems required for man-rating the 3A. The Titan 23B was launched from SLC-4W at Vandenberg AFB. Its main payload was the GAMBIT (KH-8 reconnaissance) satellites, in nine flights from 1969 through 1971. Configuration:

First stage: 2 × LR-87-AJ11 Second stage: LR-91-AJ11 Third stage: Agena-D

Titan 24B

The Titan 24B differed from the Titan 23B in that the Titan IIIM core with extended propellant tanks was used in place of the original Titan II core. The payload remained attached to the Agena stage. Twenty-three flights took place from SLC-4W at Vandenberg AFB between 1971 and 1984, with two failures. Configuration:

First stage: 2 × LR-87-AJ11, extended tank Second stage: LR-91-AJ11 Third stage: Agena-D

Titan 33B

The Titan 33B was a Titan 23B with the entire Agena and payload completely enclosed in a shroud. It flew only three times from SLC-4W at Vandenberg AFB between 1971 and 1973 with one failure, being used to launch Jumpseat satellites. Configuration:

First stage: 2 × LR-87-AJ11 Second stage: LR-91-AJ11 Third stage: Agena-D, larger fairing

Titan 34B

The Titan 34B was a Titan 24B, modified by the addition of the larger fairing used on the Titan 33B. Eleven flights took place from SLC-4W at Vandenberg AFB between 1975 and 1987. Configuration:

First stage: 2 × LR-87-AJ11, extended tank Second stage: LR-91-AJ11 Third stage: Agena-D, larger fairing

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Titan IIIB

Start with the simplest possible case. Write down what Titan IIIB 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 Titan IIIB 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 Titan IIIB 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 Titan IIIB

In research: Titan IIIB 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 Titan IIIB 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: Titan IIIB is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1973 in spaceflight, Military equipment introduced in the 1960s, Titan (rocket family), so understanding it makes those chapters shorter.
In everyday life: Look for Titan IIIB 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.

How to study Titan IIIB in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Titan IIIB 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 Titan IIIB out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Titan IIIB in simple terms?

Titan IIIB was the collective name for a number of derivatives of the Titan II ICBM and Titan III launch vehicle, modified by the addition of an Agena upper stage. It consisted of five separate rockets.

Why does Titan IIIB 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 Titan IIIB?

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 Titan IIIB.