Lockheed Martin P-791

The P-791 has a tri-hull shape, with disk-shaped cushions on the bottom for landing. As a hybrid airship, part of the weight of the craft and its payload are supported by aerostatic (buoyant) lift and the remainder is supported by aerodynamic lift. The combination of aerodynamic and aerostatic lift is an attempt to benefit from both the high speed of aerodynamic craft and the lifting capacity of aerostatic craft.{{cite web |title=A Comprehensive Look at Lockheed Martin's Hybrid Airships |url=https://www.forbes.com/sites/greatspeculations/2015/07/09/a-comprehensive-look-at-lockheed-martins-hybrid-airships/#79d5d3fd4c9d |work=Forbes |access-date=3 March 2019 |language=English |quote=The airships are considered "hybrid" in nature because they apply both aerostatic (i.e., buoyant) and aerodynamic technologies to achieve lift, thereby exceeding dirigibles in speed and planes in economy.}}

The P-791 was designed as part of the U.S. Army's Long Endurance Multi-intelligence Vehicle (LEMV) program, but lost the program's competition to Northrop Grumman's HAV-3 design. The P-791 was modified to be a civil cargo aircraft under the name SkyTug, with a lift capability of {{convert|20|ST|kg|abbr=on}} and plans to scale larger.{{cite journal|url = http://www.flightglobal.com/news/articles/skunk-works-p-791-airship-revived-as-civil-cargo-lifter-354698| last = Trimble| first = Stephen| date = 2011-05-23| title = Skunk Works P-791 airship revived as civil cargo-lifter| journal = Flight Global}}

In March 2016, Straightline Aviation signed a Letter of intent for 12 LMH1 airships, valued at $480 million.{{cite web|url=https://www.cnbc.com/2016/03/29/lockheed-has-liftoff-sells-new-airships-in-480m-deal.html|title=Lockheed has liftoff: Sells new airships in $480M deal|first=Jane|last=Wells|date=30 March 2016|website=www.cnbc.com|access-date=30 December 2018}}

In 2014, Hybrid Enterprises from Atlanta, Georgia entered into an agreement with Lockheed Martin to market and sell the commercial LMH-1 Hybrid Aircraft built by Lockheed, based on the technology demonstrated by the P-791.{{cite web |title=Hybrid Air Freighters Signs Letter of Intent to Purchase Lockheed Martin Hybrid Airships |url=https://www.prnewswire.com/news-releases/hybrid-air-freighters-signs-letter-of-intent-to-purchase-lockheed-martin-hybrid-airships-300474933.html |agency=PR Newswire|publisher=PR Newswire Association LLC |access-date=15 March 2019 |language=English |date=20 June 2017}}

At the Paris Air Show in June 2015, Lockheed Martin announced that all required FAA certification planning steps were complete, and Hybrid Enterprises was accepting orders.{{cite journal|url = http://breakingdefense.com/2015/06/lockheed-hands-off-hybrid-airship-to-commercial-reseller/| last = Clark| first = Colin| date = 2015-06-16| title = Lockheed Hands Off Hybrid Airship To Commercial Reseller| journal = Breaking Defense}} The LMH1 would initially transport 20 tonnes of cargo or 19 passengers, plus 2 crew members, with deliveries beginning in 2018.{{cite journal|url = http://www.flightglobal.com/news/articles/paris-lockheed-introduces-new-hybrid-airship-design-413685/| last = Stevenson| first = Beth| date = 2015-06-16| title = PARIS: Lockheed introduces new hybrid airship design| journal = Flight Global}} In September 2016, plans were announced to operate the LMH-1 craft in Alaska.{{cite web|url=http://www.dpaonthenet.net/article/123705/Lockheed-Martin-hybrid-airships-are-coming-to-Alaska.aspx|title=Lockheed Martin hybrid airships are coming to Alaska|website=www.dpaonthenet.net|access-date=30 December 2018}}

In September 2017 it was announced that the first flight of the LMH-1 was being delayed to 2019.{{Cite web|url=https://www.skiesmag.com/news/lmh-1-airship-float-pushed-2019/|title=LMH-1 airship "float out" pushed to 2019|website=Skies Mag|date=22 September 2017 |language=en-US|access-date=2019-02-22}}

In May 2023, Lockheed Martin announced the transfer of intellectual property and assets related to their airship business, and the LMH-1, to a new company, called AT² Aerospace, which would continue the development of the LMH-1 as the Z1 hybrid airship.{{Cite web |last=Lobner |first=Peter |date=2023-05-10 |title=Lockheed Martin Passes Its Mantle for Hybrid Airship Development and Commercialization to AT2 {{!}} The Lyncean Group of San Diego |url=https://lynceans.org/all-posts/lockheed-martin-passes-its-mantle-for-hybrid-airship-development-and-commercialization-to-at2-aerospace/ |access-date=2024-04-15 |language=en}}

== LMZ1M ==

The Lockheed Martin LMZ1M is the follow on to the P-791 test vehicle.{{cite web|url=https://www.nbcnews.com/business/travel/improved-designs-technologies-welcome-new-era-airships-flna6C10626754|title=Improved designs and technologies welcome a 'new era of airships'|website=NBC News|date=13 July 2013 |access-date=30 December 2018}}{{cite web|url=http://aviationweek.com/blog/proposed-rules-provide-peek-lockheeds-cargo-airship|title=Proposed Rules Provide Peek at Lockheed's Cargo Airship|first=Graham Warwick in Things With|last=Wings|website=aviationweek.com|access-date=30 December 2018}}

• Hybrid Air Vehicles HAV 304 Airlander 10
• Aeroscraft
• EosXi
• Helistat
• Thermoplan

{{reflist}}

{{Commons category}}

• {{webarchive |url=https://web.archive.org/web/20191231120757/https://www.lockheedmartin.com/en-us/products/hybrid-airship.html |date=31 December 2019 |title=Hybrid Airship}}
• {{webarchive |url=https://web.archive.org/web/20070927013117/http://www.aviationweek.com/aw/generic/story_generic.jsp?channel=awst&id=news/020606p2.xml |date=27 September 2007 |title=P-791 AVIATION WEEK }}
• [http://www.airliners.net/open.file?id=1153517 "Picture of the Lockheed Martin P-791 aircraft"] Airliners.net
• [http://www.snotr.com/video/619 Video of test flight] snort.com
• [https://www.engadget.com/2009/09/23/us-looking-to-deploy-long-endurance-hybrid-airship-over-afghanis/ "US looking to deploy long-endurance hybrid airship over Afghanistan"] September 2009 engadget.com
• {{YouTube|CKAyJ3zKTus|LM promotional video}}
• {{Cite web

|title=Hybrid Air Vehicle (P-791)

|date=2010-09-01

|author=Lockheed Martin

|url=http://aerospaceblog.wordpress.com/2010/09/01/hybrid-air-vehicle-p-791/

|work=aerospaceblog.wordpress.com

|quote=press release by Lockheed Martin Aeronautics

}}

{{Lockheed aircraft}}

P-791

Category:2000s United States experimental aircraft

Category:Airships of the United States