flexo
Posts: 344
Joined: Thu Mar 29, 2007 6:55 pm

B-2 Efficiency - How Does It Compare?

Tue Mar 25, 2008 7:12 pm

Over in civil aviation and Tech Ops there are a lot of topics about blended wing body airplanes and how that would be the ultimate step in efficiency if ever a company were brave enough to build one for commercial use.

As the B2 is a BWB how does it compare efficiency wise with other large bombers? Does it have a higher payload with lower fuel consumption (or greater range)? Or is all that too classified for anyone to know or post here?
 
BladeLWS
Posts: 358
Joined: Wed Dec 14, 2005 12:41 pm

RE: B-2 Efficiency - How Does It Compare?

Tue Mar 25, 2008 7:22 pm

Most of that is classified, but here are the publicly known figures for the B-52, B-1, and B-2

B-52

Performance

* Maximum speed: 560 kt (650 mph, 1,000 km/h)
* Combat radius: 4,480 mi (3,890 NM, 7,210 km)
* Ferry range: 11,000 mi (9,560 nm, 15,000 km)
* Service ceiling 50,000 ft (17,000 m)
* Rate of climb: 6,270 ft/min.[74] (31.85 m/s)
* Wing loading: 30 lb/ft² (150 kg/m²)
* Thrust/weight: 0.51
* Lift-to-drag ratio: 21.5 (estimated)
Ordnance: up to 60,000 lb (27,200 kg) bombs, missiles, and mines, in various configurations

B-1

Performance

* Maximum speed:
o At sea level: Mach 0.92 (700 mph, 1,130 km/h)
o At altitude: Mach 1.25 (950 mph, 1,529 km/h)
* Combat radius: 2,993 nm (3,445 mi, 5,543 km)
* Maximum range: 6,478 nm (7,456 mi, 11,998 km)
* Service ceiling 60,000 ft (18,000 m)
* Wing loading: 167 lb/ft² (816 kg/m²)
* Thrust/weight: 0.37
* Fuel capacity, optional: 10,000 U.S. gal (38,000 L) fuel tank for 1-3 internal weapons bays each

Ordnance: * Six external hardpoints for an additional 59,000 lb (27,000 kg) of ordnance (use for weapons currently restricted by START I treaty)
* Three internal bays for 75,000 lb (34,000 kg) of ordnance.

B-2
Performance

* Maximum speed: 410 knots (760 km/h, 470 mph)
* Range: 5,600 nm (10,400 km, 6,400 mi)
* Service ceiling 50,000 ft (15,000 m)
* Wing loading: 67.3 lb/ft² (329 kg/m²)
* Thrust/weight: 0.205
Ordnance: 2 internal bays for 50,000 lb (22,700 kg) of ordnance.
 
jgarrido
Posts: 258
Joined: Thu Mar 08, 2007 4:40 pm

RE: B-2 Efficiency - How Does It Compare?

Tue Mar 25, 2008 8:05 pm

It's hard to compare them on their published stats, really. You have a 50 year old bomber with 8 engines, built when jet engines on a long range plane was a new concept. A mach 1+ bomber with 4 engines that produce the same amount of thrust as those on a F-15. And of course a plane designed not to be seen by radar or IR.

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