science

Tachikawa Ki-94

Tachikawa Ki-94 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 Tachikawa Ki-94 rather than just read about it. In short: The Tachikawa Ki-94 was a single-seat fighter-interceptor aircraft project undertaken by the Tachikawa Aircraft Company and to be operated by the Imperial Japanese Army. The project refers to two aircraft designs: the Ki-94-I and the Ki-94-II, both of which did not advance beyond the mock-up and prototype stage respectively.

Key takeaways

Tachikawa Ki-94 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tachikawa Ki-94 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tachikawa Ki-94 from memory before moving on to harder problems.

Reference excerpt

The Tachikawa Ki-94 was a single-seat fighter-interceptor aircraft project undertaken by the Tachikawa Aircraft Company and to be operated by the Imperial Japanese Army. The project refers to two aircraft designs: the Ki-94-I and the Ki-94-II, both of which did not advance beyond the mock-up and prototype stage respectively.

Design and development

Ki-94-I

The first was a twin-boom monoplane with two 1,641 kW (2,201 hp) Mitsubishi Ha211 18-cylinder engines, driving two 4-blade propellers in a push-pull configuration. The very heavy armament planned for the aircraft (two 37 mm (1.46 in) and two 30 mm (1.18 in) cannon should have been enough to make short work of most US heavy bombers of the era. Notwithstanding the outstanding prospective performance, which however, was judged as "unduly optimistic" by the technical department of the Japanese Army Air Force, this design was judged too complex by the technical department, and the design was discarded.

Ki-94-II The second Ki-94 design, made by a team also under Tatsuo Hasegawa as type I, chief designer of the aircraft and responsible for the used airfoil, was a more conventional single-seat, piston-engine monoplane fighter developed for the Imperial Japanese Army Air Force along the same requirements as the Nakajima Ki-87, which had been the Army's fall-back design for the original Ki-94. Intended to counter B-29 raids, it was optimized for high-altitude interception with a pressurized cockpit and heavy armament. This design was approved by the Koku Hombu, and the aircraft was designated Ki-94-II (the scrapped earlier Ki-94 design was named the Ki-94-I). An order was placed for one static test airframe, three prototypes, and eighteen pre-production aircraft. Only two prototypes were built in the event; the first was equipped with a single 1,895 kW (2,541 hp) Nakajima Ha219 [Ha-44] engine, driving a 4-blade propeller because the 6-blade one was not ready. The second prototype was to be fitted with a 6-blade propeller. The War's end however stopped the construction of the second prototype and also found the first prototype still being readied for its maiden flight. So, the Ki-94-II never took to the air.

Specifications (Ki-94-II (estimated performance)) Data from Famous Aircraft of the World, first series, no.76: Japanese Army Experimental Fighters (1), Japanese Aircraft of the Pacific WarGeneral characteristics Crew: 1 Length: 12 m (39 ft 4 in) Wingspan: 14 m (45 ft 11 in) Height: 4.65 m (15 ft 3 in) Wing area: 28 m2 (300 sq ft) Airfoil: root: (Tatsuo Hasegawa) TH346-8454 (17%); tip: (Tatsuo Hasegawa) TH346-7s505 (10%) Empty weight: 4,690 kg (10,340 lb) Gross weight: 6,450 kg (14,220 lb) Powerplant: 1 × Nakajima Ha219 (unified [Ha-44-12]) 18-cylinder air-cooled radial piston engine, 1,830 kW (2,450 hp) for take-off 1,750 kW (2,350 hp) at 1,100 m (3,600 ft) 1,600 kW (2,200 hp) at 4,400 m (14,400 ft) 1,520 kW (2,040 hp) at 11,000 m (36,000 ft) Propellers: 4-bladed constant-speed propeller Performance

Maximum speed: 712 km/h (442 mph, 384 kn) Cruise speed: 440 km/h (270 mph, 240 kn) Range: 2,100 km (1,300 mi, 1,100 nmi) Service ceiling: 14,680 m (48,160 ft) Time to altitude: 5,000 m (16,000 ft) in 5 minutes 9 seconds 10,000 m (33,000 ft) in 17 minutes 38 seconds 13,000 m (43,000 ft) in 21 minutes 3 seconds Wing loading: 230.4 kg/m2 (47.2 lb/sq ft) Power/mass: 0.283 kW/kg (0.172 hp/lb) Armament

Guns: 2 × 30 mm (1.181 in) Ho-155 cannon and 2 × 20 mm (0.787 in) Ho-5 cannon both in the wings, Bombs: 2 × 250 kg (550 lb) bombs or 1 × 500 kg (1,100 lb) bomb

Illustrations

Worked examples

Example 1 — a first encounter with Tachikawa Ki-94

Start with the simplest possible case. Write down what Tachikawa Ki-94 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 Tachikawa Ki-94 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 Tachikawa Ki-94 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 Tachikawa Ki-94

In research: Tachikawa Ki-94 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 Tachikawa Ki-94 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: Tachikawa Ki-94 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1940s Japanese experimental aircraft, 1940s Japanese fighter aircraft, Inverted gull-wing aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Tachikawa Ki-94 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 Tachikawa Ki-94 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tachikawa Ki-94 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 Tachikawa Ki-94 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tachikawa Ki-94 in simple terms?

Why does Tachikawa Ki-94 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 Tachikawa Ki-94?

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 Tachikawa Ki-94.