New Gulfstream Aircraft Type?
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A cabin altitude of 4,850 feet at FL510 and 2,800 feet at FL410 reduces fatigue, increases mental alertness and enhances productivity, while a quieter cabin provides a more comfortable environment for conversation or relaxation.
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nomorecatering:-
I should imagine that Gulfstream will try very hard to stick with the "simple" wing design i.e. without the use of moveable leading edge devices. In their sales campaigns, they have always maintained the "simple versus complex" is best approach. This aspect of the Bombardier product, which Gulfstream assert has a more mechanically complex wing system, is regarded by them as a poor selling point from the maintenance cost aspect of the operation of the aircraft. I leave it to you to judge what is best from a landing performance / approach speed perspective.
I should imagine that Gulfstream will try very hard to stick with the "simple" wing design i.e. without the use of moveable leading edge devices. In their sales campaigns, they have always maintained the "simple versus complex" is best approach. This aspect of the Bombardier product, which Gulfstream assert has a more mechanically complex wing system, is regarded by them as a poor selling point from the maintenance cost aspect of the operation of the aircraft. I leave it to you to judge what is best from a landing performance / approach speed perspective.
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Will it have the traditional Gulfstream with with Single slotted flaps and no leading edge devices?
I should imagine that Gulfstream will try very hard to stick with the "simple" wing design i.e. without the use of moveable leading edge devices. In their sales campaigns, they have always maintained the "simple versus complex" is best approach. This aspect of the Bombardier product, which Gulfstream assert has a more mechanically complex wing system, is regarded by them as a poor selling point from the maintenance cost aspect of the operation of the aircraft. I leave it to you to judge what is best from a landing performance / approach speed perspective.
They're quoting 3000ft "landing distance" at MLW (83,500lbs). The brochure states (p19) that the wing has a fixed LE but doesn't detail the flap design. Incidentally, the brochure is also marked "Demo version - not for public release". It's been that way since the announcement - surprised they haven't fixed that yet.
Now, if I check the landing distance for the GEX, at about 83000lbs I get an actual landing distance (unfactored) of 2800ft. I'm going to assume that G650 number is also unfactored (otherwise, wow) so assuming comparable braking (which I think is fair, there's only so much friction to be had) implies that the G650 will be landing a little faster than a GEX does at the same weight. It's less than 10% in distance, so likely less than 5% in speed.
The GEX wing is slatted of course, so the G650 is going to have less CLmax naturally at comparable flap angles, so either they have to go for a bigger flap angle than the GEX (and similar flap complexity, too) or they need a bigger wing. If they're going for simple, then it makes no sense to leave the slat off but then have a very complex flap system. Guesstimating the effectiveness of the slat, I'd have thought you'd need about 25% more wing area to compensate. So unless they're doing something "sneaky" (and with FBW maybe they can pull some tricks with regard to stall speeds) I'd say that should be a 1250 sq.ft. wing.
(Alternatively, the G550 has 2770ft ALD at 75000lbs MLW; assuming a similar CLmax for the G650, they'll need a wing about 10% bigger to maintain similar performance; the G550 quotes 1137 sqft, plus 10% is again in the 1250sqft range. I think that as it stands, on a same-weight basis, the G650 will be a shade better than the G550 for field perf as a result)
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FAA Type Certification by 2011?
Gulfstream hasn't certified an all-new airplane since the GII about 40 years ago. It will be interesting to see if they can actually get their TC in 3 years.
http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/7CC722691C7E2E1B8625711D006B8572/$FILE/A12EA.pdf
http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/7CC722691C7E2E1B8625711D006B8572/$FILE/A12EA.pdf
I am just a dumbbell pilot flying Brand B (the Montreal folks) and I'm trying to make sense of this:
Bigger cabin than GLEX by about 4 inches in cross section
Another 1000 pounds of thrust than the GLEX
AUW of 99,400 pounds, identical to GLEX with latest GW SB
800 pounds less fuel, which means a slightly lower fuel fraction. (see Breguet range formula)
AND it will go at least a 1000 miles (call it 2+10 hrs) farther than the GLEX
Either this new wing is AMAZING in efficiency and the engine is a order of efficiency better
OR
It is constructed with Unobtainium!
That is a big, big improvement in performance and cabin. If it happens, it'll tough to beat.
Bigger cabin than GLEX by about 4 inches in cross section
Another 1000 pounds of thrust than the GLEX
AUW of 99,400 pounds, identical to GLEX with latest GW SB
800 pounds less fuel, which means a slightly lower fuel fraction. (see Breguet range formula)
AND it will go at least a 1000 miles (call it 2+10 hrs) farther than the GLEX
Either this new wing is AMAZING in efficiency and the engine is a order of efficiency better
OR
It is constructed with Unobtainium!
That is a big, big improvement in performance and cabin. If it happens, it'll tough to beat.
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no rocket science
The secret about building an effective airplane? Weight saving, clean and effective wing and fuel-saving engines. Check out he 7X vs. the G500. Roughly the same range and speed (yes, I know the cabin of the G500 is longer - but considerably narrower), but the 7X ist about 23,000 lbs. lighter...
Same thing when you compare a CL605 with a F2000EX, by the way.
You can dispute whether or not the French build good cars. Their airplanes are impressive though...
Same thing when you compare a CL605 with a F2000EX, by the way.
You can dispute whether or not the French build good cars. Their airplanes are impressive though...
Well, the engine has 3.5% better TSFC, so they are gaining about 10% from the wing design. They must be seeing a lot a ops above FL 450
GF
GF
