Pützer Moraa

from Wikipedia, the free encyclopedia
Pützer Moraa
Pützer Motorraab in the Schleissheim aircraft yard
Type: Sport plane
Design country:

GermanyGermany Germany

Manufacturer:

Alfons Pützer KG

First flight:

May 8, 1955

Number of pieces:

4th

The Pützer Moraa (Motorraab) is a sport aircraft from the German designer Alfons Pützer .

history

After it became clear that motorized flight would be released in West Germany in 1954, Alfons Pützer began to consider designing his own motorized touring aircraft. According to his philosophy of "flying for everyone", the future aircraft should make few demands on its pilots and at the same time be inexpensive to manufacture and later maintain in order to be attractive to the largest possible group of buyers. The prototype of the Horten Ho 33 already under construction at Alfons Pützer KG was not suitable for this.

Alfons Pützer therefore examined the existing, simpler glider designs in Germany for their expandability for motorized travel. One of the most successful German post-war designs of the early 1950s was the two-seater practice sailor Raab Doppelraab by Fritz Raab , which largely fulfilled Alfons Pützer's ideas. Alfons Pützer and Fritz Raab agreed on a joint further development of a motorized double rack under the name "Pützer Motorraab" for Alfons Pützer KG . Alfons Pützer then commissioned Fritz Raab to prepare suitable design documents.

Despite the existing construction ban, construction of the Pützer Motorraab began in early 1955 at Alfons Pützer KG in Bonn. The company Martin Neulen KG from Oberhausen took over the production of the tubular steel construction, while Alfons Pützer KG built wings and tail units. To prevent the Allies from confiscating the powered aircraft, Alfons Pützer initially decided not to install the engine. The engine system was only installed on May 5, 1955, on the day the motorized flight was released in West Germany. The Pützer Motorraab V1 (D-EBAC) took off on May 8, 1955 at 7:35 am in Bonn-Hangelar for its maiden flight, which was also one of the first powered flights of a powered aircraft manufactured in Germany after 1945.

The flight characteristics were good, but the aircraft turned out to be underpowered. After a rollover due to a broken nose wheel, not only the cabin was modified as part of the repair, but the engine was also replaced by a 38 kW Porsche 678/3. After that, three more machines (D-EKAD, D-EHOG, D-ECIB) were built, with the V2 taking off for its first flight on March 1, 1956. It was later presented to officials and officers of the newly founded air force in advance of the tender for the initial equipment of the air sports groups. The V3 flew between 1958 and 1975 with the appropriate equipment as a measurement carrier for the German Research Institute for Flight Mechanics in Braunschweig and is now on display in the Flugwerft Schleissheim , a branch of the Deutsches Museum , in Oberschleißheim . The type certification for Motorraab was issued by the Luftfahrt-Bundesamt on May 22, 1959, four years after the first flight of the V1. Instead of the type designation "Motorraab", the designation "Moraa" later became established. The Motorraab was later developed into the Pützer Elster .

After 1958 in Oberhausen, Martin Neulen KG produced 4–6 additional so-called "Motorraab-B" with a smaller 42 HP Stamo 1400D engine. More Motorraabs were created in the years that followed through their own conversions by Doppelraabs.

construction

Like the Doppelraab, the Motorraab was also a two-seater shoulder- wing aircraft with a tubular steel frame that was braced on the hull. The seats were arranged closely one behind the other so that the flight instructor seated at the back could take over the control stick over the shoulder of the student while the school was running. The tail unit and wings of the braced high-wing aircraft were made of wood. As the engine for the prototype, Pützer selected a simple 30 HP Beetle engine, for which Raab completely redesigned the nose of the Motorraab. A fixed main landing gear and a controllable nose landing gear were also provided. From the Moraa V2, the 52 hp Porsche 678/3 aircraft engine was used. At the same time, the wooden components tail unit and wing were reinforced again.

Services

Germany flight 1956

In the period from 22.-24. In June 1956 the Motorraab V1 with the start number P3 and V2 with the start number P4 competed in Group III on the first flight to Germany after the end of the Second World War. The V2 retired shortly after the start in Bonn-Hangelar near Siegburg with an engine failure. The V1 with Johann Müller and Franz Berger reached the end point of the Germany flight in Stuttgart-Echterding and took 6th place out of 25 competitors in their class. In the overall ranking, the V1 reached 15th place with 71 participants.

First registration as a motor glider

The Motorraab V4 has been approved by Martin Neulen as a D-ECIB powered aircraft. After the introduction of the new K-Class for motor gliders in the Federal Republic of Germany, the V4 was approved as D-KCIB in 1959 as one of the first aircraft in this class.

Technical specifications

Parameter Moraa (V1) Moraa Neulen Moraa B
crew 1 1 1
Passengers 1 1 1
length 5.50 m / 6.50 m (*) 7.20 m 7.20 m
span 13.70 m / 13.40 m (*) 13.70 13.70 m
height 2.50 m / 1.70 m (*) 2.50 m 2.50 m
Wing area 18.50 m² / 18.00 m (*) 18.50 m² 18.50 m²
Payload 230 kg / 200 kg 305 kg 220 kg
Empty mass 320 kg / 330 kg (*) 320 kg 405 kg
Max. Takeoff mass 550 kg / 530 kg (*) 625 kg 625 kg
Cruising speed 100 km / h 100 km / h
Top speed 110 km / h 180 km / h
Service ceiling 4800 m
Take-off / landing route 220 m / 130 m
Engines 1 × 50 HP VW Beetle engine Porsche PFM678 / 3 with 38 kW 1 × 42 hp Stamo 1400D

(*) Information from Pützer sales brochure 1956

See also

literature

  • Paul Zöller, Hanns-Jakob Pützer: Pützer aircraft . Norderstedt, 2018, ISBN 978-3-7481-2096-4 .
  • Heinz Dieter Schneider, Alfons Pützer und seine Rabenvögel , Flugzeug Classic 3/2007, pp. 62–66
  • nn, The constructions of Alfons Pützer - Kurzer Höhenflug der Elster , FliegerRevue October 2010, pp. 56–59

Web links

Individual evidence

  1. ^ A b Alfons Pützer, Hanns-Jakob Pützer: Pützer Memories 1918-1972 , unpublished, 1972
  2. ^ A b c d e Paul Zöller, Hanns-Jakob Pützer: Pützer aircraft . Norderstedt, 2018, ISBN 978-3-7481-2096-4 .
  3. ↑ a b c FliegerRevue October 2010, pp. 56–59, The constructions of Alfons Pützer - Kurzer Höhenflug der Elster
  4. ↑ Alfons Pützer homepage , see Pützer picture archive Moraa-B-0005
  5. ^ Heinz Dieter Schneider, Alfons Pützer und seine Rabenvögel , Flugzeug Classic 3/2007, pp. 62–66
  6. ^ Rolf Wurster, 50 Years of German Motor Aircraft, ISBN 978-3-8311-1854-0
  7. ↑ Alfons Pützer homepage , see document archive Moraa-D-0001