Post-war Horten designs

[Erdosain]

 

[Erdosain]

 

[Erdosain]

Last Saturday, a room in tribute to Reimar Horten was inaugurated at the National Aeronautics Museum in Moron, Buenos Aires, Argentina.

For now, the HoXb Piernifero is exhibited there along with some models, including the I-37 and IA-38 Naranjero by Juan Manuel Mascarello

In the future it is planned to incorporate the I.Ae.41 Urubú, which should be restored

 

[Erdosain]

Horten tailless fighter, alternative to the Pulqui II.

Caza sin cola de Horten, alternativa al Pulqui II.

Entre sus diseños realizados en Argentina, Reimar Horten dejó uno muy singular. Un caza ala volante como alternativa al I.Ae. 33 Pulqui II,.

nobarrelrolls.blogspot.com

 

[Erdosain]

Presentation of the book "Reimar Horten, the genius of flying wings" by Guillermo F. Regnier, this Wednesday, December 6 at 6:00 p.m. at the College of Specialist Engineers of the city of Córdoba, Argentine.

 

[Erdosain]

A new one for me.....A twin-engine fighter project, presented by Dr Reimar Horten in 1971

 

[Erdosain]

Finally, I got the book and the sensations are mixed.

As a biography or historical book, I don't really recommend it. The author is not part of the circle of Argentine aeronautical historians and writers and it is noted that he wrote the entire book based on anecdotes or stories that Reimar Horten's son told him. He doesn't seem to have done much research on the subject in official documentation or previous publications.

For example, he says that the design of the IA-58 Pucara was commissioned to Horten by the dictator Juan Carlos Ongania in the 60s. And that one day he entered his office and all the drawings and design reports had disappeared and then when they appeared, they were signed by Commodore Ing. Hector Ruiz. Something totally false, and there is a lot of documentation available about it.

He also says that Boeing used the Horten IV and VI to design the swept wings of the B-707. Or that Horten designed the Vulcan while he was in England and then Avro presented the design as its own.

And as always, the comparison with Northrop, which supposedly based on Horten's designs, the story of Northrop engineers working secretly for two weeks in Horten's house who advised them on the design of the B-2 , etc. As if the XB-35 and YB-49 had never flown while the Ho-XVIII Amerika Bomber did not go beyond a drawing presented in February/March 45

Many legends and myths to exalt the figure of Horten and little historical rigor.

The only interesting thing that makes it worth having is the number of drawings and photos for unpublished projects made by Horten at the FMA. I suppose that over time they will begin to be uploaded to the web.

 

[Erdosain]

In March 1974, an IIAE team led by Dr Reimar Horten presented a project based on the Pucara, equipped with Astafan jets to fulfill the role of advanced training and tactical support aircraft. The drawing is dated 11/22/1973

Los IA-58 Pucará a reaccion

Por Gonzalo Sebastian Rengel Graficos: Alejandro Klichowski El imaginario popular argentino siempre resalta el gran logro tecnológico que fueron los

www.zona-militar.com

 

[Erdosain]

Five proposals for commercial transport aircraft dated July 26, 1960. Horten presents these proposals within a project to build a medium transport for civil use

 

[Erdosain]

Preliminary project of a civil transport aircraft for 40 passengers and four crew members, dated August 1960

 

[Erdosain]

DINFIA IA-35 Bastan

Redesign of the IA-35 Huanquero that would eventually lead to the IA-50 GII. It was intended to change the I.Ae R-19 "El Indio" radial engines for the French Turbomeca Bastan III turboprops.

Horten, supposedly, was in charge of the lengthening of the fuselage, design and calculation of the engine mount and the introduction of new avionics in the cockpit

 

[richard B]

Reimar Horten designed "normal" seaplanes too ; among them , the INAV-1 (1953) and the "Condor andodino" (1958)

 

[Erdosain]

Fast transport and training aircraft, for two pilots and eight passengers. It is based on the tailless delta fighter presented by Horten to the FMA in 1949, as an alternative to the Pulqui II.

 

[Erdosain]

Reimar Horten designed "normal" seaplanes too ; among them , the INAV-1 (1953) and the "Condor andodino" (1958)

View attachment 718370


View attachment 718371

That's right, Horten designed many conventional gliders.
For example, there was the IA-49 high-performance single-seat glider.
The wings was equipped with laminar airfoil.
Horten began development of the IA-49 in 1959 and it was canceled in 1961.
He also developed cargo and assault gliders, which did not make it out of the blue. I'll upload them now.

 

[Stargazer]

Reimar Horten designed "normal" seaplanes too

You meant SAILplanes, of course, not seaplanes...

 

[robunos]

That's right, Horten designed many conventional gliders.
For example, there was the IA-49 high-performance single-seat glider.
The wings was equipped with laminar airfoil.
Horten began development of the IA-49 in 1959 and it was canceled in 1961.
He also developed cargo and assault gliders, which did not make it out of the blue. I'll upload them now.

View attachment 718730

Darmstadt D-30, is that you . . . ?
(apart from the shape of the fin and rudder, and the use of a laminar flow aerofoil, it's very very similar.)


cheers,
Robin.

 

[Erdosain]

Two proposals for a two-seat training jet from Reimar Horten. The first is from 1961 and the second from 1974 (with folding wings), the same year where he proposed the advanced training Pucará with Marbore turbomeca jet engines.

 

[Erdosain]

The Horten Ho-XII of 1947 - 50, a civil transport aircraft capable of carrying 4 passengers.

The Ho-XII was equipped with a Boeing 502 turboprop engine.

 

[robunos]

Two proposals for a two-seat training jet from Reimar Horten. The first is from 1961 and the second from 1974 (with folding wings), the same year where he proposed the advanced training Pucará with Marbore turbomeca jet engines.

The design in the upper image (1961 design) appears to use the flying surfaces, undercarriage, and canopy of the Beech T-34 Mentor . . .

cheers,
Robin.

 

[richard B]

The design in the upper image (1961 design) appears to use the flying surfaces, undercarriage, and canopy of the Beech T-34 Mentor . . .

cheers,
Robin.

More : the Beech 73 Jet-Mentor (from Observer's book 1957)

 

[Erdosain]

The design in the upper image (1961 design) appears to use the flying surfaces, undercarriage, and canopy of the Beech T-34 Mentor . . .

cheers,
Robin.

Yes, it looks very "inspired" by the Jet Mentor. The FMA manufactured/assembled 75 B-45 Mentor under license , the first flew in 1959.

 

[Erdosain]

Some images of the IA-34 Clen Antu and IA-41 Urubu gliders

 

[Erdosain]

Commercial transport aircraft designed by Dr Reimar Horten in 1948. It carried 5 crew and 30 passengers. It was to be powered by 5 Rolls Royce Nene II or Derwent V

 

[Erdosain]

Commercial transport version of the IA-38. It carried 24 passengers, 3 crew members and 1 ton of cargo (luggage and mail). The power plant was to be two RR Nene II or Derwent V turbojets.

 

[Erdosain]

Agricultural Airplane Project presented by Horten in 1958

 

[robunos]

That aspect ratio seems a bit high, and I don't like that thin wing root, even with the bracing strut.
IMHO, for an Ag aircraft, I'd be happy to sacrifice some aerodynamic efficiency, for structural strength and manouvreability . . .

cheers,
Robin.

 

[Erdosain]

Reimar Horten's project for a fast light transport aircraft (1963)

 

[Stargazer]

Thank you so much Erdosain for all these great projects!
Did Horten create them all for the F.M.A., or were some of these conceived as private ventures?

 

[Erdosain]

Thank you so much Erdosain for all these great projects!
Did Horten create them all for the F.M.A., or were some of these conceived as private ventures?

Reimar Horten worked until 1974 in the "Area Material de Cordoba Material" (AMC), within which the FMA and the IIAE were located.

I understand that all these projects were proposed or developed within the FMA, which at that time depended on the Argentine Air Force.

 

[Stargazer]

Reimar Horten worked until 1974 in the "Area Material de Cordoba Material" (AMC), within which the FMA and the IIAE were located.
I understand that all these projects were proposed or developed within the FMA, which at that time depended on the Argentine Air Force.

Thanks!

 

[Erdosain]

A cargo and assault glider with a load of 3 tons, could carry a Jeep in its hold, presented by Reimar Horten to the FMA in 1950.

 

[Erdosain]

Another project by Reimar Horten for the FMA, a combat glider from 1956, with an MTOW of 1400 kg. The glider took off towed from a DC-3.
Attach files

 

[Erdosain]

Horten's Delta Jet Wing trainer, presented to the FMA in 1953.

 

[Tonton-42]

Alalala! There are still some who will say that Payen copied Horten and Lippisch to design his Pa-49 on 1953 ...

https://minijets.org/wp-content/uploads/2021/01/Payen_PA49_Katy_05.jpg

 

[Erdosain]

Alalala! There are still some who will say that Payen copied Horten and Lippisch to design his Pa-49 on 1953 ...

https://minijets.org/wp-content/uploads/2021/01/Payen_PA49_Katy_05.jpg

There is a kind of religion around Horten, especially in Germany and Argentina, placing him as the maximum and only reference on delta wings and flying wings, reviling the works of other references such as Northrop with phrases like "Northrop did not know Horten's lift bell and He didn't know how to make a flying wing fly and make it stable."

 

[riggerrob]

Horten's Delta Jet Wing trainer, presented to the FMA in 1953.

View attachment 722275


View attachment 722276

That huge wing area implies light wing-loading, which further suggests slow landing speeds, which are better for student pilots.
It also means that the airplane can use a small engine.

 

[robunos]

That huge wing area implies light wing-loading, which further suggests slow landing speeds, which are better for student pilots.
It also means that the airplane can use a small engine.

The 3 view shows twin engines . . .
Also, it's a member of the exclusive Tailwheel Jet Club . . .

cheers,
Robin.

 

[riggerrob]

The 3 view shows twin engines . . .
Also, it's a member of the exclusive Tailwheel Jet Club . . .

cheers,
Robin.

If you look at modern, light deltas like Dyke Delta and VerHees Delta, you will notice that there landing-gear is set at precisely the correct attitude for landings and take-offs. VerHees has a similar tail-wheel landing gear, albeit with a single, large main-wheel and multiple tail-wheels. One Dyke Delta pilot explained that he simply advances the throttle and the plane takes off by itself.
If they touch down at too shallow an angle-of-attack, they will be too fast and float the entire length of the runway.
OTOH If they get too slow, they will get too steep an angle-of-attack and that produces massive amounts of drag. That is why deltas (see Concorde) tend to carry plenty of power on final approach. In a worst-case scenario, a low aspect-ratio delta can get so steep that it cannot “power” it’s way out of the high-drag corner. So pilots are forced to trade altitude for airspeed resulting in a rapid rate-of-descent.

 

[Erdosain]

Horten IA-37 wind tunnel model, drawing from December 12, 1956.

 

[Erdosain]

In March 1974, an IIAE team led by Dr Reimar Horten presented a project based on the Pucara, equipped with Astafan jets to fulfill the role of advanced training and tactical support aircraft. The plan is dated November 22, 1973.

Well, this is the three-view drawing that I was missing of the Pucará Jet, since the only one existing in the documentation that I had was the size comparison with the original IA-58A Pucará, where both overlapped.

The drawing was in the index of the project file but it was missing from it... as if someone had "taken it as a souvenir"... But hey, I finally got it:

The IA-58 Pucará jet

Los IA-58 Pucará a reaccion

Por Gonzalo Sebastian Rengel Graficos: Alejandro Klichowski El imaginario popular argentino siempre resalta el gran logro tecnológico que fueron los

www.zona-militar.com