Lockheed Martin P-791
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The Lockheed Martin P-791 was an experimental aerostatic/aerodynamic hybrid airship, developed by Lockheed Martin. The first flight of the P-791 took place on 31 January 2006 at the company's flight test facility, located at Palmdale Air Force Plant 42.
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.
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 20 short tons (18,000 kg) and plans to scale larger.
In 2014, Hybrid Enterprises from Atlanta, Georgia entered into an agreement with Lockheed Martin to market and sell the commercial LMH1 Hybrid Aircraft built by Lockheed, based on the technology demonstrated by the P-791.[full citation needed] 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. The LMH1 would initially transport 20 tonnes of cargo or 19 passengers, plus 2 crew members, with deliveries beginning in 2018.
- Trimble, Stephen (30 December 2009), "US Army revives hybrid airship interest with LEMV", Flight Global
- Trimble, Stephen (2011-05-23). "Skunk Works P-791 airship revived as civil cargo-lifter". Flight Global.
- Clark, Colin (2015-06-16). "Lockheed Hands Off Hybrid Airship To Commercial Reseller". Breaking Defense.
- Stevenson, Beth (2015-06-16). "PARIS: Lockheed introduces new hybrid airship design". Flight Global.
- P-791 AVIATION WEEK Link from archive.org replacing dead link.
- "Picture of the Lockheed Martin P-791 aircraft" Airliners.net
- Video of test flight snort.com
- "US looking to deploy long-endurance hybrid airship over Afghanistan" September 2009 engadget.com
- LM promotional video at YouTube
- Lockheed Martin (2010-09-01). "Hybrid Air Vehicle (P-791)". aerospaceblog.wordpress.com.
press release by Lockheed Martin Aeronautics
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