It bears striking resemblance with the now defunct PERSIUS. New efforts along the same lines continue under program LEMV (Long Endurance Multi-INT Vehicle)Triton said:The Lockheed Martin P-791 is an experimental aerostatic/aerodynamic hybrid airship. The first flight of the P-791 was made on 31 January 2006 at the company's flight test facility on the Palmdale Air Force Plant 42. The reason for the construction of the P-791 is unknown but some observers believe that it might have been developed as part of the DARPA Walrus HULA project.
The big problem for airships and altitude is lift not wind speed. As the atmosphere gets thinner the realtive lift of the lighter-than-air gas reduces. So in order for Zeppelins and others to fly high they have to sacrifice payload that they could carry in the thick air of low altitudes. Of course you could design your LTA for the lower lift levels of high altitude like the Lockheed BMD LTA but your gas envelope to payload margin is significantly increased.AeroFranz said:Well, so far all manned airships have been limited to about 10,000 feet cruise altitude (some Zeppelins flew higher during WW I). I guess you could pressurize a gondola and fly higher, but then statistically you find higher windspeeds, which are very bad for airships.
I hadn't thought about it, but that could certainly be the case, especially since I can't tell where the propulsion pack is in that picture. That leaves the tail as a likely position.Simon666 said:Is it just me or does it really look like it has the shape proposed by Goldschmied for wake propulsion?
The metal mesh would do nothing. Most anti-air missiles are designed to explode in proximity to the target and any armour layer – mesh or solid – would need to be very strong and weighty to stop enough high velocity fragments to make any difference.Avimimus said:I've often wondered what would happen if you placed a metal mesh underneath an airship. It might still remain vulnerable to high calibre/high velocity artillery, but it would temporarily negate the effectiveness of most missiles (until ones are developed with two stage warheads at least).
Aerospace companies typically produce program fliers for distribution to potential customers at trade shows. These fliers include a photo or artist concept of the program with key details on the reverse side. This 11 X 14 inch data flier describes the HIGHSPOT program from the early 1980’s, a high altitude blimp technology predecessor to the modern RPV. It is in very good condition. I will be shipped rolled.