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#2 & #3 Hydraulic systems elimininate the Electrical Hydraulic demand pumps and revert back to the Air Driven Hydraulic demand pumps. http://farm3.static.flickr.com/2560/...fa29630064.jpg So either 2 & 3 demand pumps are AC pumps or the ADPs have been moved possibly into the wing to body fairing with the new RAT like the 777. |
From the -8 Differences program from Boeing:
Originally Posted by Boeing
Higher capacity EDP's, Demands all air-driven (was optional on the -400), both aux pumps are basic on the -8
(Changes from Baseline -400 are in Magenta) #1 = 3.0 CIPR Engine driven Pump, 3.0 CIPR Air Driven Pump, Aux pump #2 = 3.0 CIPR Engine driven pump, 3.0 CIPR Air driven pump #3 = 3.0 CIPR Engine driven pump, 3.0 CIPR Air driven pump, RAT #4 = 3.0 CIPR Engine driven pump, 3.0 CIPR Air driven pump, Aux pump The Ram Air Turbine: -Auto & Manual Deployment -Hydraulic system #3 -Alternate action switch is the same P/N as found on the 757/767 |
So they must be in the wing to body fairing, any details Deltabravowhiskey?
Cheers. |
I only have the operational details, nothing from the structural side of the house.
There are a lot of basic changes, nothing that much different than the -400. I will say however that if you like the Airbus landing gear lever you are REALLY gonna love the -8's...:bored: |
Just found this article.
Guggenheim cancels orders for two Boeing 747-8Fs Guggenheim Aviation Partners (GAP) has cancelled half of its 747-8F order, the company confirms. GAP reduced its order for the new jumbo freighter by two, with two remaining 747 aircraft on order. The company first ordered four 747-8Fs in October 2007. While GAP declined to specify why it cancelled half the order, GAP chief executive Steve Rimmer told ATI and Flightglobal in October that despite the dismal cargo market, existing 747 freighters might be more accessible. At the time Rimmer said: "we've never seen this quantity of freighters before in the desert" and added that "this time we won't see the market pick up fast because there's a lot of good quality aircraft in the desert". The cancellations were reflected in Boeing's final year-end update to its order total, bringing the 747-8 backlog to 108 orders for the stretched jumbo. Of those 108, 76 are for the freighter version and 32 for the passenger and VIP -8I variant. Boeing plans to fly the 747-8F early this year, with first delivery to Luxembourg's Cargolux in the fourth quarter. |
Awesome idea to drop the rat into the #3 engine that is allready producing drag in an emergency...
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Nice observation, but....
This ain't exactly a Seneca II we're talkin' bout here. This jets' got gobs of excess power you can't begin to comprehend. |
The only time a RAT is used is when those "gobs of power that I can not comprehend" fail to produce due to engine failure.
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747-8
Now 2nd one on the flight line :D
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747 40th anniversary
Forty years ago this week, Boeing's 747 began earning money for its launch customer Pan Am. In this special package to mark the 40th anniversary, we outline how the Jumbo Jet evolved, talk to the man who led the team that created it, and examine what lies ahead for the next-generation models. Full article here, quite long, worth a read. 747 40th Anniversary |
muduckace your confusing me here. What do you mean about dropping the RAT "into" the engine. I think what Deltabravowhiskey was talking about is hydraulic system number 3 not engine number 3. ie the RAT deploys to prussurise system number 3. Comes out somwhere on the belly I believe...no?
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GEnx-2b . . . axial flow compressor stages that are geared with each other?
Reminds me of back in the fifties when the (then) new geared recip engines of the DC-7's and Super Connies were implemented. With engine gearing and the PRT (power recovery turbine), recip design reached max development and could be improved no further . . . . . History now repeating itself? |
The -2B is a standard two-spool axial flow turbine. The difference is the bi-directional flow from HPT to LPT increasing the energy transfer effiency.
Pratt is currently working on the "GTF" but this is a much smaller engine in the RJ thrust range. There is talk of increasing it to the 737 thrust range down the road. |
RAT
Yes, normally a RAT deploys out of the fuscelage to supply hyd pressure or electral power that may be used to also power a elec/hyd pump.
Re-reading his post I believe you are correct in his reference to a hyd system as opposed to an engine. |
747-8 Freighter completes final gauntlet test
The 747 program on Saturday completed final gauntlet testing on the first 747-8 Freighter. This testing verified the readiness of the systems for flight. With Chief Pilot Mark Feuerstein in the flight deck, the test team in Everett, Wash., put the airplane through a simulation of the entire first flight profile. The flight simulation lasted approximately 40 hours and tested all airplane systems, hardware and software. The team will now spend a few days analyzing the data from the test.
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747-8
The third one is now on the flight line, currently unpainted.
Can't wait to see the first flight. :ok: |
First Flight
Scheduled for next monday (Feb. 8), depending on the weather as usual.
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Boeing says 747-8 freighter's taxi tests went well
EVERETT, Wash. - Boeing Co. says taxi tests on its giant 747-8 freighter went well, and the new plane should make its first flight on Monday.
The company says the plane performed well during the tests at Paine Field in Everett on Saturday, reaching a top speed of 103.5 mph. The new jet is the largest Boeing has ever built, at 250 feet long. That's about 18 feet longer than the existing 747-400 jumbo jet and more than twice the length of the Wright Brothers' first flight. Boeing also plans a passenger version of the plane.:D |
Holding for weather. Live webcast here : Boeing 747-8 Freighter First Flight
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