Beneš-Mráz Be-50 Beta Minor – A Favourable First

Beneš-Mráz: Short Lived, but Successful 

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Be-50 Beta Minor seen at Pardubice, Czech Republic in 2016.

The name Beneš-Mráz may not be well known outside the Czech lands, the company only existed from 1935 to 1939. However, in that short window of time, the company produced no fewer than 14 aircraft designs for the civil market.

The company was founded by accomplished aviation engineer Pavel Beneš and businessman Jaroslav Mráz. Previous to partnering with Mráz, Beneš had founded the famous Avia company in 1919 with fellow engineer Miroslav Hajn.  Beneš also spent time working in the aircraft division of the Praga company before partnering with Mráz in the mid 1930s and setting up a factory in Cocheň in the northern part of today’s Czech Republic. By 1939, Beneš had divested himself of his part of the company and it was renamed Mráz to reflect the change in ownership.

Through the German occupation of World War II, the rise and fall of Socialism and a number of name changes of the years; the legacy of Beneš-Mráz has carried on to today in the form of Orličan a.s., a sailplane manufacturer that continues to operate in their ancestral home of Cocheň.

The Be-50 Beta Minor: A Solid Start 

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Beta Minor at Pardubice in 2016.

Summer of 1935 saw the first flight of the first aircraft type designed by the newly established Beneš-Mráz company, the Be-50 Beta Minor.

The Beta Minor was designed for touring, training and sport flying and proved an excellent start for the company. The aircraft was a very clean design with viceless handling qualities that made it popular with flying clubs of Czechoslovakia at the time.

With a large part of the airframe comprised of wood, the Beta Minor was, at 460 kilograms, a light yet sturdy aircraft. It was powered by a domestically designed and built Walter Minor four cylinder engine that could propel the aircraft to a very respectable top speed of 195 kilometers per hour. A combination of light weight and efficient design gave the Beta Minor a range of 750 kilometers without refueling. The aircraft gave a quite good account of itself at a number of distance based races in the late 1930s.

Outside of being very much a pilot’s plane, the Be-50 was also appreciated for mechanical reliability, ease of maintenance and very good short take off and landing performance. A total of 43 Be-50 aircraft were made in the original run by Beneš-Mráz and developed further via the Be-51 series in 1936.

The Be-51 was based on the Be-50, but featured a fully enclosed cockpit and a somewhat shortened wingspan; these modifications gave the Be-51 improved speed and aerobatic ability over the Be-50. The Be-50 shared the Beta Minor name with the Be-51.

In the Reich and the Resistance 

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The clean lines of the Be-50 seen to good effect over Pardubice in 2016.

As with so many other domestically developed aircraft in Czechoslovakia, the existing Be-50 and Be-51 aircraft in the country were commandeered for Luftwaffe service with the 1939 arrival of German occupational forces.

The Luftwaffe made use of both Be-50 and Be-51 types for liason and training work.

Beta Minors also found their way into the service of the Independent State of Croatia and the Slovak State, two German friendly puppet states that existed during the Second World War. The aircraft were primarily used as trainers and couriers by both bodies.

A strong anti-Axis partisan resistance movement rose up in Yugoslavia through the Second World War and at least one Beta Minor aircraft was captured from Croatian hands by partisan forces late in the conflict.

Very few Beta Minors survived the war and those which did were destroyed soon after the end of hostilities.

The Be-50 Today and Further Reading 

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The world’s sole Be-50 Beta Minor at Pardubice in 2016.

For many years, the world had no extant examples of the Beta Minor in any form.

Happily, the original plans of the Be-50 have survived to the present and through several years of careful work in the early 2000s, the Military Historic Institute of the Czech Republic (VHU) built a fully fresh Be-50 faithfully following the original plans. The aircraft was put on static display to the public in 2013 and flew for the first time in 2015. It’s currently active on the Czech civil register and makes appearances at shows around the country.

The aircraft has a few concessions made for modern aviation regualtions and was given construction number 44 to fit in with the original 43 made by Beneš-Mráz themselves so many years before. It is considered a true Be-50 rather than a replica in many quarters.

When it is not flying, it is usually kept on display at the Methodius Vlach Aviation Museum in Mladá Boleslav, north east of Prague in the Czech Republic.

The following links have all been through a translator function and their English is somewhat rough as a result. However, they do contain a good amount of information about the original Be-50 development as well as the new built example:

http://www.letecke-muzeum-metodeje-vlacha.cz/exponaty/letadla-letuschopna/benes-mraz-be-50-beta-minor/

https://translate.google.cz/translate?hl=en&sl=cs&u=http://www.vhu.cz/letoun-beta-minor-be-50-ze-sbirek-vhu-se-poprve-vznesl/&prev=search

https://translate.google.cz/translate?hl=en&sl=cs&u=http://www.pilotinfo.cz/z-historie/historicka-letadla/opomenuty-prvni-vzlet-repliky-letounu-benes-mraz-beta-minor&prev=search

Beech Model 18 Revisited

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Putting a New Shine to an Old Article

Those of you that have followed this blog for a while are likely aware that I’ve had an entry about the Beechcraft Model 18 for sometime. In fact, it may be one of my earliest entries.

Between last weekend and this one, I decided it was time to bring that article up to the standard of my more recent ones.

Revisions included editing and extension of text, refreshment of photographs and an extended section of links for further reading.

I’m much happier with the revised article and I hope you will be too.

https://pickledwings.wordpress.com/beech-model-18-vintage-and-versatile/

Fiat G.91 – Gina go Lightly

Legendary Bloodlines 

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Former Luftwaffe G.91 R/3 seen preserved at Berlin-Gatow in 2016.

Fiat Aviazione, the aircraft division of the legendary Fiat automobile company, was established in 1908 in Turin and was responsible for some of the Italian aircraft industry’s most famous aircraft from the early interwar period to the late 1960s when it left the airframe manufacturing busines to concentrate on aero engines.  Since 2013, though a series of mergers, acquisitions and rebrandings dating to the late 1960s, the legacy of Fiat Aviazione has lived on through in Avio S.p.A., a Turin based subsidiary of General Electric’s aviation arm.

The G.91 was part of a series of aircraft designed by the masterful Giuseppe Gabrielli (1903-1987) during his tenure with the company which lasted from 1931 to the end of their airframe design activities in the late 1960s. In the catalogue of Fiat aircraft, Gabrielli designed machines are easily recognised by the “G” prefix; this was in keeping with Fiat’s practice of using the designer’s initials as the prefix for the aircraft model number.

While the G.91 was designed to be a strightforward and simple aircraft, the story of it’s development and introduction to service is anything but. At that, Let’s spend some time with the Fiat G.91, or “Gina” as it was nicknamed by many who worked with it:

Defining the Light Fighter 

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Former Luftwaffe G.91 T/3 trainer preserved at Berlin-Gatow in 2016.

Very early in the jet age, with the reality of nuclear conflict looming large in the background of rapidly increasing Cold War tensions, the nations of NATO were forced to reevaluate the shape and nature of how their air combat assets were deployed and maintained in continental Europe.

The Korean War had highlighted the need for greater air support of ground forces in modern combat and revealed some of the drawbacks of the increasingly complex nature of jet combat aircraft. One of the main drawbacks was that with increasing complexity came rising costs that sharply curtailed the number of aircraft that could be ordered to the point that they could not be purchased in high enough numbers to be deployed in battle effectively. Air bases were getting bigger to accomodate more complex aircraft support facilities, runways longer to support heavier aircraft and the distance between the air base and the front lines was increasing to the point where the aircraft would have very little time over their targets before having to return to base for fuel. Additionally, the larger size of fixed air bases made them very easy targets and impossible to conceal.

Consideration of those factors led NATO to issue a requirement in 1953 for a new light weight strike aircraft that could be deployed away from large bases and with minimal support facilities. The aircraft would also be able to be produced in large numbers cheaply and be seen as an expendable asset that could be used widely in NATO.

The specification for the new aircraft stipulated that it had to be operable from grass and straight stretches of road, take off in 1,100 metres, have a combat range of 280 kilometres that included 10 minutes time over a target, carry a fixed armament of four 12.7mm machine guns or two 20mm cannons in addition to 454 kg of unguided munitions under the wings, have a maximum speed of Mach 0.95 and a maximum empty weight of no more than 2,268 kg.

It was a high order for the time period and the state of jet combat aircraft technology of the time. However, thanks to work already done in Great Britain in the very early 1950s, it was not an impossible goal to attain. By 1952, work on what would become the Folland Gnat trainer was well underway and work on the Bristol Orpheus engine that would power it had begun in 1953. By late 1954, the Orpheus engine had been run for the first time.

The Orpheus would solve one of the biggest obstacles to the light fighter concept at the time, finding an engine which could deliver the required thrust and yet be light enough to keep the aircraft within the stipulated weight parameters. The Orpheus, like the aircraft it was designed to power, was of simple design and easy to service without specialised equipment.

Selection and Development

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Another angle on the G.91 T/3 preserved at Berlin-Gatow in 2016.

By July of 1955, after nearly two years of selection, NATO announced their shortlist of the winning designs which would be approved for prototype development and final competition for the new light fighter. Fiat’s competition came in the form of the Dassault Étendard VI and Breguet Br.1001 Taon, both from France. Aside of the original specifications, NATO had also dictated that all three competing aircraft were to use the Orpheus engine as a power source.

The selection of the Orpheus was due in large part to America heavily funding the engine’s development through the US Mutual Weapons Development Programme. In fact, though British by design, relatively little British money funded the development of the engine.

The G.91 first flew in August of 1956, nearly a full calendar year before the first flight of either French design going against it. Despite this headstart, the initial G.91 prototype experienced some control and vibration problems and was lost in a crash in early 1957. After extensive investigation and reworking, a revised second prototype flew for the first time in July of 1957.

Third and fourth G.91 prototypes were sent to France, where the competition was being held in Autumn of 1957, and performed very well. NATO anounced the G.91 to be the winner of the competition in January of 1958.

While the G.91 had been successful in the competition for NATO’s new light fighter, political and financial factors as well as fading interest in the light fighter concept would conspire against it becoming a widely used aircraft. Initial users of the G.91 were to be France, Italy, Turkey and West Germany. America would provide partial funding for the French, German and Italian G.91 purchases and fully fund the Turkish order.

France, using the loss of the first G.91 prototype as an arguing point, disputed the outcome of the competition and opted to further develop the Dassault Étendard on their own rather than have anything to do with the Italian aircraft.

In 1961, evaluation samples of the G.91 were provided to Greece and Turkey as well as the U.S. Army and U.S. Air Force. In the end, none of them accepted the aircraft into service. After evaluation, Turkey cancelled their G.91 order and the aircraft that had already been built for them by that point were given to West Germany instead.

Interest in the G.91 was shown by Austria, Israel, Norway, South Africa and Switzerland. However orders from the European nations never materialized and the Italian government vetoed sales to Israel and South Africa for political reasons.

Ultimately, all Ginas built served only Italy, Portugal and West Germany.

The G.91 in Production and Service 

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Former Luftwaffe G.91 R/3 preserved at Berlin-Gatow in 2016.

The G.91 enjoyed a 19 year production run and assembly lines existed for it in both Italy and West Germany. While production totals vary somewhat by source, most place the number of Ginas built between 750 and 770.

The G.91 had given NATO nearly 40 years of service when the last ones were retired from Italian service in 1995.

West Germany was the first G.91 user to retire their fleet of the aircraft, doing so in the early 1980s. Over the years, many former German Ginas and spare parts for them were purchased by Portugal. It was in Portuguese service that the G.91 would see combat; several of the aircraft were sent to Africa for close air support of ground troops in the Portuguese Colonial War which lasted from 1961 to 1974. Portugal continued to use the G.91 until 1993.

Five main operational variants of the G.91 were produced:

G.91 R/1
The R/1 was the first production version of the G.91 and differed outwardly from pre-production machines by having a redesigned nose capable of holding cameras for reconnaissance work. Changes to avionics and instruments created the R/1A subvariant while structural strengthening created the R/1B.

G.91 R/3
This was a variation for the Luftwaffe which was equiped with a pair of 30mm cannons as fixed armament.

G.91 R/4
Initially intended for Greece and Turkey, the R/4 fleet was transfered to the Luftwaffe and used for training until retirement in 1966. Several of this variant were sold to Portugal after their Luftwaffe days were over.

G.91 T/1
This was the two seat training variant used by the Italian air force.

G.91 T/3
The T/3 was the Luftwaffe training variant. Several found their way into Portuguese service.

G.91 PAN
While not a major operational version, the PAN is worthy of note being as how it was a long time mount of the Italian air force air demonstartion team, Frecce Tricolori.

I have not included the later two engine G.91Y in the above list as it is only a G.91 in the most nominal of senses. Beyond a passing resemblance and a designation that suggests it being a member of the G.91 family, the G.91Y was a completely different aircraft nose to tail that didn’t have a single component in common with the single seat G.91 line.

The Gina Today and Further Reading

Many examples of the G.91 survive in museums across Europe and further afield, so getting a close look at one today is not an overly difficult task depending on your geographic location.

At the time of writing, March of 2017, I could find no evidence that there ever has been a G.91 restored to airworthy status on any civil register. However, I was able to find some small bits of information regarding a long term project in Germany to restore a T/3 to flying status. While I could find no information on that project more recent than 2015, the information I could find included photos of the disassembled aircraft components in a  hangar and seemingly well cared for.

Time will tell if the world will see the G.91 fly again.

The following two links will give you some insight into the early development of the G.91:

https://www.flightglobal.com/pdfarchive/view/1958/1958%20-%200680.html

https://www.flightglobal.com/pdfarchive/view/1959/1959%20-%200928.html

These two links will give you similar insights into the Bristol Orpheus engine:

https://www.flightglobal.com/pdfarchive/view/1957/1957%20-%200917.html

https://www.flightglobal.com/pdfarchive/view/1959/1959%20-%200446.html

These links will give you some information on the Gina’s French competition:

http://www.dassault-aviation.com/en/passion/aircraft/military-dassault-aircraft/etendard/

http://www.cmchant.com/fighters-which-did-not-make-the-cut-the-breguet-br-100-taon

This link will show you some pictures of a G.91 PAN preserved in America

https://travelforaircraft.wordpress.com/2014/06/16/fiat-g-91-a-frecce-tricolori-write/