OMRE OE-01

Key takeaways

OMRE OE-01 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect OMRE OE-01 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OMRE OE-01 from memory before moving on to harder problems.

Reference excerpt

The OMRE OE-1 (a.k.a. Rubik R-20) was an experimental high performance sailplane designed and built in Hungary during 1950–1951.

Design and development During design work for the Rubik R-22 Június-18 and the need for a high performance glider for competition and record breaking was realised. Requirements included a minimum sinking speed of only slightly over 0,5 m/s, a best glide ratio of 32 to 35 with a low curvature polar curve to give good performance at higher speeds. The wing design evolved into a high aspect ratio of 23:1, a modest wing loading of 20 kg/m2 and light alloy stressed skin structure, giving a smooth surface and the prospect of laminar flow. Initial design work was carried out at OMRE – Országos Magyar Repülö Egyesület (National Hungarian Flying Association) but this organisation was taken over by MRSz (Hungarian Aeronautical Association) during 1951, resulting in the loss of experienced designers and constructors. The Dunakeszi workshops of the MRSz were not capable of producing the light alloy structure of the OE-1, as designed, so an all wooden wing was built using traditional methods. The OE-1 was a cantilever mid-wing monoplane built entirely of wood with plywood skinning on structural parts and aircraft fabric covering on control surfaces. Features included a fixed main-wheel, V-tail and tail parachute for approach control. Flight tests of the OE-1 began on 14 May 1951, demonstrating good performance at moderate speeds and good handling characteristics. The design goal of good performance at high speeds was not realised due to the poor surface finish and deformation of the wings under load at high speed. Laminar flow was not achieved which resulted in much higher drag, particularly at high speeds. During the take over the more design staff were dispersed and not available to continue development of the OE-1. Despite good handling qualities the OE-1 was not liked by pilots due to the unusually high flexibility of the wing and its mid set position which resulted in the wing tips being close to the ground. The OE-1 was also not certified for aerobatics, spin and cloud flying which limited its usefulness and appeal. The sole OE-1 was scrapped in the late 1950s. The cantilever, mid set, wooden wing of the OE-1 consisted of three parts: the 9 m (30 ft) span 90 cm (3.0 ft) chord rectangular planform centre section and two tapered outer panels 4.5 m (14.8 ft) span and rounded wing-tips. Three position plain flaps were fitted to the trailing edges of the centre section with a chord of 24 cm (9 in) and set positions of −0.5, +8 and +80 degrees. Ailerons occupied the entire trailing edges of the outer panels. A shallow gull form was due to reduced dihedral on the outer panels. The airfoil section chosen was derived from the NACA 23012 by Márton Pap, with the thickness of the section modified to achieve the desired pressure distribution. Maximum thickness was moved back to 45% chord to achieve laminar flow, checked in the wind tunnel of the Technical University of Budapest. The fuselage of the OE-1 was designed with minimal cross sectional area, transitioning from circular at the nose to ovoid at the cockpit back to circular for the tapered tail-boom. The pilots seat was located at the bottom skin and control rods routed through channels either side of the cockpit. The landing gear comprised a main-wheel aft of the centre of gravity with nose and tail-skids sprung with rubber. A spring-loaded 1.1 m (3.6 ft) diameter parachute was fitted in the tail cone which could be deployed and retracted by the pilot as required. V-tail surfaces were carried at the end of the tail-boom at an angle of 114° to each other with push rods operating the large horn balanced ruddervators for yaw control as well as pitch.

Specifications (OMRE OE-1) Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du MondeGeneral characteristics Crew: 1 Length: 7.25 m (23 ft 9 in) Wingspan: 18 m (59 ft 1 in) Wing area: 13.95 m2 (150.2 sq ft) Aspect ratio: 23.3 Empty weight: 215 kg (474 lb) equipped Max takeoff weight: 315 kg (694 lb) Performance

Stall speed: 62 km/h (39 mph, 33 kn) Never exceed speed: 220 km/h (140 mph, 120 kn) Aerotow speed: 125 km/h (67.5 kn; 77.7 mph) Winch launch speed: 100 km/h (54.0 kn; 62.1 mph) g limits: +4 Maximum glide ratio: 32.3 at 80 km/h (43.2 kn; 49.7 mph) Rate of sink: 0.65 m/s (128 ft/min) at 75 km/h (40.5 kn; 46.6 mph) Wing loading: 22.5 kg/m2 (4.6 lb/sq ft)

Notes

References

External links Hungarian Gliders 1933–2000 Gliders in Hungary

Worked examples

Example 1 — a first encounter with OMRE OE-01

Start with the simplest possible case. Write down what OMRE OE-01 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 OMRE OE-01 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 OMRE OE-01 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 OMRE OE-01

In research: OMRE OE-01 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 OMRE OE-01 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: OMRE OE-01 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950s Hungarian sailplanes, Aircraft first flown in 1951, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for OMRE OE-01 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 OMRE OE-01 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OMRE OE-01 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 OMRE OE-01 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OMRE OE-01 in simple terms?

The OMRE OE-1 (a.k.a. Rubik R-20) was an experimental high performance sailplane designed and built in Hungary during 1950–1951.

Why does OMRE OE-01 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 OMRE OE-01?

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 OMRE OE-01.