Lear Jet projects in the 1960s

hesham

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by the way,

the Gates Lear jet Twinjet helicopter project was called Model-112.

http://books.google.com.eg/books?id=rBksUk40jlEC&pg=PA200&dq=wing+forward-swept&hl=ar&ei=-_SATPjeJMiLOPubrKsO&sa=X&oi=book_result&ct=result&resnum=5&ved=0CDwQ6AEwBA#v=onepage&q&f=true
 

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fightingirish

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From Flug-Revue 1964
 

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frank

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Is the Lear 28 what eventually became the Canadair Challenger?
 

Caravellarella

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Dear Boys and Girls, here is a short article in French announcing the Lear Model 40 Lear Liner regional jet which would have been powered by the same Rolls-Royce Spey Junior engines as the Fokker F.28 Fellowship......

The article comes from the 1st November 1965 issue of Aviation Magazine International......

Terry (Caravellarella)
 

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Grey Havoc

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Any idea why the Model-112 didn't make it to the prototype stage? (Google Books link doesn't seem to be working)
 

Caravellarella

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Grey Havoc said:
Any idea why the Model-112 didn't make it to the prototype stage? (Google Books link doesn't seem to be working)

Sorry Grey Havoc, I don't know why the Gates Model 112 Twinjet helicopter remained a "project". Here is an article in French that I've found......

The article comes from the 1st October 1969 issue of Aviation Magazine International......

Terry (Caravellarella)
 

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Jos Heyman

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Has anybody ever heard of a Lear Astronics Q-20. I picked this up many years ago from an obscure source an I have assumed if may be a drone in the USAF Q series, but no ther info found so far.
 

Stargazer2006

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Jos Heyman said:
Has anybody ever heard of a Lear Astronics Q-20. I picked this up many years ago from an obscure source an I have assumed if may be a drone in the USAF Q series, but no ther info found so far.

Highly unlikely if we consider the fact that the original Q- series was post-war and ended with the 1962 tri-service system at XQ-12, the Beech Jayhawk (there was also a Q-14 but it was just the former PQ-14 redesignated in 1948). After that, the drones or RPVs were given QM- designations in the main missile and unmanned list. So there is no way a Lear Q-20 could have found its way there either. As for today's new "Q-" system, introduced in 1994 with the General Atomics Predator, it has only just reached #19 with the AAI XMQ-19A Aerosonde in 2009... So you see, there is no room there either for your "Q-20", sorry... :-\
 

Caravellarella

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Stargazer2006 said:
Terry, you're da man!!! ;)

Well I've not been called that before; so thank you Stéphane ;D......

Here is another image of the Lear Model 40 Lear Liner regional jet project......

The image comes from the 1st August 1966 issue of Aviation Magazine International......

Terry (Caravellarella)
 

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Caravellarella

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Dear Boys and Girls, here is another article in French about the Lear Model 40 Lear Liner regional jet "project"......

The article comes from the 15th June 1966 issue of Aviation Magazine International......

Terry (Caravellarella)
 

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Caravellarella

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Dear Boys and Girls, here is a picture with a caption in French of the mock-up of the Gates Model 112 Twinjet helicopter project as exhibited at the NBAA in 1969......

The picture comes from the 15th November 1969 issue of Aviation Magazine International......

Terry (Caravellarella)
 

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Stargazer2006

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Gates' Twinjet - the Corporate Ship that Never Left the Ground

The Gales Twinjet helicopter, a twin-turbine ship designed for corporate transportation and utility applications, was 10 years and one recession ahead of its time. Unveiled as a mock-up craft on September 11, 1969, at the Gates LearJet plant in Wichita, Kansas, the pioneering helicopter was to cruise at 180 mph and carry eight to twelve passengers.

The project gathered what some called the finest group of experts from throughout the helicopter industry, and drew upon the experience of engineers from Bell, Boeing Vertol, Hughes and Sikorsky. More than $4 million was spent on the project, with more than 100 full-time engineering personnel involved.

Preliminary structural details announced in 1969 were for an aircraft that would sell for between $400,000 and $450,000 that could be used for office-to-airport travel. Range would be 400 miles. It was to have a fuselage that would be both aerodynamic and make maximum use of cabin space. It would have a low empty weight and an optimized rotor configuration that would provide the best lift/drag ratio for high performance at a gross weight of 6,000 lbs.

The four-bladed main rotor's diameter was 40 feet, and the ship's overall length was 42 feet. Two 474-shp Garrett TSE turboshaft engines were to be mounted above the main cabin in stub wing fairings. The baggage compartment was to be 70 cubic feet.

Complete preliminary layouts of all systems had been accomplished, and master tooling and major production facilities were nearly operational when the project was dropped because of the 1970-71 recession. The Gates Twinjet had been scheduled to make its first flight in 1971, with FAA type certification to have been completed in 1972.

The model shown is a part of the Helicopter Foundation International (HFI) collection. It was constructed by Gates Aircraft and donated to HFJ. The scale model is available for viewing at HAl headquarters in Alexandria, Virginia.

Source: ROTOR, Spring 1997
 

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fightingirish

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Even 45 years later, this helicopter design looks modern and very cool! B)


Source: Ein echter Geschäftshubschrauber: Die Gates Twinjet Helicopter - Interavia Germany, November 1969, pages 1784 and 1785
 

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Jemiba

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Found in VertiFlite, December 1969, a color photo of the GTH mockup and a drawing
of the internal arrangement in the executive transport and in the air ambulance version:
 

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Stargazer2006

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Nice! Thanks for these.

Can the "Re:" be removed in the topic's title? Thanks in advance... ;-)
 

Triton

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https://www.facebook.com/photo.php?fbid=10205223323319584&set=o.34366349783&type=1&theater
https://www.facebook.com/photo.php?fbid=10205223323479588&set=o.34366349783&type=1&theater
 

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elmayerle

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When I worked there, 1979-1982, I remember seeing a few drawings of a twin-turboprop pusher design. What particularly boggled my mind at the time was that the intended engines were some rather modified TPE331s. If memory serves me correctly, and this is looking back some 35+ years, it did look somewhat like the later Piaggio Avanti. I wish I'd taken more of an interest in this info then.
 

RAP

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Lear Jet helicopter

AWST article
 

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hesham

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Re: Lear Jet helicopter

My dear RAP,

we have it here;

https://www.secretprojects.co.uk/forum/index.php/topic,18024.msg103086.html#msg103086
 

RAP

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Re: Lear Jet helicopter

My bad. Mods feel free to move or delete.

Topics merged
 

yasotay

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Found this in a 1969 copy of AHS Vertiflight Magazine.
 

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