science

ProFe Banjo

ProFe Banjo 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 ProFe Banjo rather than just read about it. In short: The ProFe Banjo is a family of Czech high-wing, strut-braced, T-tailed gliders and motor gliders designed and produced by ProFe in kit form for amateur construction. Design and development Named for the musical instrument of the same name, the Banjo series of gliders consists of three models, the basic glider model, a powered version and the two seat DuoBanjo.

Key takeaways

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

Reference excerpt

The ProFe Banjo is a family of Czech high-wing, strut-braced, T-tailed gliders and motor gliders designed and produced by ProFe in kit form for amateur construction.

Design and development Named for the musical instrument of the same name, the Banjo series of gliders consists of three models, the basic glider model, a powered version and the two seat DuoBanjo. The Banjo sailplane is of mixed construction. Its 13.3 m (43.6 ft) span wing is strut-braced with one lift strut per side and uses a plywood box spar and spruce wing ribs, with the leading edge of the wing covered in plywood and the rear portion covered in aircraft fabric covering. The nose ribs are expanded polystyrene while the ailerons are made of wood and covered in fabric. The wing airfoil is an SM701 at the wing root transitioning to a Wortmann FX-60-126 at the wing tip, while the tailplane uses a Wortmann FX-71-L-150/30 airfoil. The fuselage is of fibreglass monocoque construction, while its one-piece bubble canopy is made from polycarbonate. The aircraft has fixed monowheel landing gear with a wheel brake and upper wing surface air brakes.

Variants Banjo Unpowered single-seat sailplane with a 13.3 m (43.6 ft) span wing. Four were reported completed and flying in 1998. In production in 2011. Banjo-MH Powered version of the Banjo, with a retractable tractor configuration Hirth F33 two stroke 21 kW (28 hp) motor powering a two-bladed wooden propeller. Fuel capacity is 14 litres (3.1 imp gal; 3.7 US gal), gross weight is 260 kg (573 lb) and load limits +4 and -2g. The aircraft has a best glide ratio of 28:1. In production in 2011. The Banjo-MH is also marketed by Junkers Profly of Kulmbach, Germany as the Junkers Banjo-MH. DuoBanjo Two seats in tandem version, with two side-by-side main wheels mounted in the fuselage and a retractable tractor configuration Rotax 447 two-stroke 30 kW (40 hp) motor powering a ProFe 1.4 m (4.6 ft) two-bladed wooden propeller. Wing span is 16 m (52.5 ft), fuel capacity is 27 litres (5.9 imp gal; 7.1 US gal), gross weight is 460 kg (1,014 lb) and load limits +4.4 and -2.4g. The aircraft has a best glide ratio of 29:1. In production in 2011.

Specifications (Banjo sailplane) Data from Purdy and company websiteGeneral characteristics Crew: one Length: 6.3 m (20.6 ft) Wingspan: 13.29 m (43.60 ft) Wing area: 10.5 m2 (113 sq ft) Airfoil: Wing root: SM701, wing tip: Wortmann FX-60-126 Empty weight: 100 kg (220 lb) Gross weight: 200 kg (440 lb) Performance

Stall speed: 50 km/h (31 mph, 27 kn) Never exceed speed: 140 km/h (87 mph, 76 kn) g limits: +4.4/-2.2 Maximum glide ratio: 28:1 Rate of sink: 0.68 m/s (134 ft/min) Wing loading: 19.0 kg/m2 (3.89 lb/sq ft)

Worked examples

Example 1 — a first encounter with ProFe Banjo

Start with the simplest possible case. Write down what ProFe Banjo 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 ProFe Banjo 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 ProFe Banjo 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 ProFe Banjo

In research: ProFe Banjo 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 ProFe Banjo 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: ProFe Banjo is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1990s Czech and Czechoslovak sailplanes, Glider aircraft, High-wing aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for ProFe Banjo 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “ProFe Banjo” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study ProFe Banjo in 20 minutes

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

Frequently asked questions

What is ProFe Banjo in simple terms?

The ProFe Banjo is a family of Czech high-wing, strut-braced, T-tailed gliders and motor gliders designed and produced by ProFe in kit form for amateur construction. Design and development Named for the musical instrument of the same name, the Banjo series of gliders consists of three models, the b…

Why does ProFe Banjo 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 ProFe Banjo?

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 ProFe Banjo.