It's also known as the "Spruce Goose".

[link|http://en.wikipedia.org/wiki/Spruce_Goose#Specifications|H-4 Hercules]:

[image|http://commons.wikimedia.org/upload/thumb/4/4c/300px-H-4_Hercules_2.jpg|0|Hughes H-4 Hercules|214|300]

General characteristics

* Wingspan: 319 ft 11 in (97.54 m)
* Length: 218 ft 8 in (66.65 m)
* Height: 79 ft 4 in (24.18 m)
* Fuselage height: Approx. 30 ft (9.1 m)
* Engines: 8 \ufffd Pratt & Whitney R-4360 Wasp Major, 3,000 hp (2.2 MW) each
* Propellers: 8 \ufffd four-bladed Hamilton Standard, diameter 17 ft 2 in (5.23 m)

Performance (projected)

* Intended cruising speed: Approx. 200 mph (320 km/h)
* Intended maximum range: Approx. 3,000 miles (4,800 km)
* Intended endurance (cruise): 20.9 h
* Intended service ceiling: 20,900 ft (6,370 m)


[link|http://www.pbs.org/kcet/chasingthesun/planes/a380.html#specifications|A380]:

[image|http://news.bbc.co.uk/olmedia/1390000/images/_1393390_300parisairshow3.jpg|0|A380 Mockup in Paris|280|380]

SPECIFICATIONS
Manufacturer \tAirbus
First Flight: \tSeptember 1, 2004
Wingspan: \t261 feet, 10 inches
Length: \t239 feet, 6 inches
Height: \t79 feet, 1 inch
Weight: \t606,000 pounds (empty)
Top Speed: \t652 miles per hour
Cruising Speed: \t630 miles per hour
Flight Altitude: \t43,000 feet
Range: \t8,000 miles
Engines: \t4 engines Rolls-Royce Trent 900 or Engine Alliance
Passenger
Accommodations: \t555 passengers


They're obviously quite different. The H-4 still has the longest wingspan. The [link|http://www.aerospaceweb.org/aircraft/transport-m/an225/|An-225] has the largest wingspan of the modern jets (88.4 m = 290 feet):

[image|http://www.globalaircraft.org/photos/planephotos/an-225-1.jpg|0|An-225|324"|480]

It must be fun to work on such a unique project as the A380.

Cheers,
Scott.