Not much at all if it's just a bit of chop. Consider how much your car shakes when you go over a pothole but you still feel it. Most of the time, it's within a few feet.Jump to post
As the cruise speeds are slower, you can have a thicker wing with less form drag, which means you can make it stronger for a given weight. I once tried to pencil out the cost/benefit of thicker, lighter wings versus higher wing form drag. From those two parameters I couldn't see why every airplane ...Jump to post
Air density = (2 * gravity * wing loading) / ( speed^2 * lift coefficient). This means, assuming a fixed lift coefficient, a lower wing loading allows for a lower air density, and hence a higher altitude. This can be seen when the A380 can cruise at higher altitudes initially than say the 77W. The ...Jump to post
Wired's got a story on it as well: https://www.wired.com/story/boeing-787- ... ity-flaws/Jump to post
The MoF has the prototype, no 121s.... So I'm sure they are mistaken then: https://www.museumofflight.org/aircraft/boeing-747-121 Yeah, it's not the only error they've got. IIRC their VC-137B sign has a picture of a 137C or something like that as well, not to mention the gift shop push-fits that ar...Jump to post
Orange County (gate cap), Midway (built out), La Guardia (slotted), Reagan (slotted), San Diego (slotted inside of 10), Burbank (gate cap). All constrained. All limited operational capacity airports with short runways or terrain impacted runways. The industry needs a 200 seat plane that serve these...Jump to post
Because that 10% exists, and its usually a constrained airport that needs capacity. I don't follow you. Are you saying a "constrained" airport has shorter runways? Orange County (gate cap), Midway (built out), La Guardia (slotted), Reagan (slotted), San Diego (slotted inside of 10), Burba...Jump to post
You must have missed the sarcasm: - DWI: Driving While Intoxicated; - FWI: Flying While Intoxicated. I'd be very surprised if it even exists, but it's the aviation derivative. FAR 91.17... I meant, the term "FWI". 14 CFR 91.17 lays the rules for Drugs & Alcohol, but doesn't use the te...Jump to post
FwI btw not dwi Which state? Could be both. In California, making wheels turn even a bicycle, is DWI. Lightsaber You must have missed the sarcasm: - DWI: Driving While Intoxicated; - FWI: Flying While Intoxicated. I'd be very surprised if it even exists, but it's the aviation derivative. FAR 91.17...Jump to post
Yeah, a lot of this was a big mess. One thing to add: on the 330/340, the quad was to launch first, and hence be the 330, but sales told marketing that the quad should be "340," which is why those model numbers were out of sequence. They also skipped the -100, because so many -100 series a...Jump to post
Couple thoughts regarding the "less efficient altitude" idea: 1. The pressure changes will give you a little bit better TAS, but I'm not sure how to model compressibility at transonic speeds and how much of an effect it has 2. The temperature lapse rate stays at roughly 2*/1k feet until ar...Jump to post
LH707330 wrote: Couple questions: 1. Are those fuel burn numbers trip burn or trip burn per pax? Trip fuel burn, its in Kilos LH707330 wrote: If it isn't normalized, then you get 410/365=1.12, so 12% more pax for free. Add that to the 10% SFC gain, and you're about in the right ballpark. Fuel burn ...Jump to post
Couple questions: 1. Are those fuel burn numbers trip burn or trip burn per pax? If it isn't normalized, then you get 410/365=1.12, so 12% more pax for free. Add that to the 10% SFC gain, and you're about in the right ballpark. 2. How are you modeling takeoff performance? If you remove 13t in DOW to...Jump to post
One issue that the V2500 team ran into with their ownership split is that nobody really "owned" it in terms of having enough skin in the game to implement PIPs for a while. One reason PW bought out RR was to address that. On the PW1000-JM, JAE and MTU are still major players, but PW is QBi...Jump to post
Were any of the 757's delivered from Boeing with winglets? MY guess is that more likely, winglets were added after delivery by Aviation Partners Boeing STC's. I was working at Boeing as an Airworthiness Inspector until about 1999-2000 and don't recall seeing any 757 delivered with winglets. IDK abo...Jump to post
747B was a designation first used in the late-1960s to market increase gross weight versions of the 747. There were to be passenger 747Bs, Convertible freighters, and pure freighter 747Bs. Here is a 2-page magazine ad for the convertible and freighter versions of the 747B for sale on EBay from 1969...Jump to post
Not too much. From my experience, departure sends the Paine traffic east or west pretty soon after departure to avoid conflicts. Check out some of the FR24 tracks and altitudes to get an idea.Jump to post
From what I've seen, Boeing is aiming at the 763ER payload/range segment, and needs to figure out if such a right-sized plane will sell enough units at the price point airlines are willing to pay in order to warrant the investment. I agree that many make that argument. My problem with that is: 767-...Jump to post
I suppose the two questions are.... (1) If either Boeing or Airbus were to design the perfect widebody to compete with the narrowbodies in terms of range*, how much better would the seat-mile costs be? *so <~5000nm at whatever capacity is optimal for their solution - which would have to include gat...Jump to post
So I want to clear this up: 1. On a still day where there is no wind...TAS and GSPD (Ground Speed) are the same? 2. If an F50 is doing 270 knots TAS, but there is a tail wind of 30 knots..the GSPD is 300 knots? 3. Which would mean if the F50 was doing 270 knots TAS but there was a head wind of 30 k...Jump to post
It nearly could. The biggest problem is the 787-9 hits maximum fuel capacity at exactly 8200nm. So it can not use any of that extra MTOW increase for fuel without an aux fuel tank. Now with the 777LR and A350-900 ACAP documents when you add an aux fuel tank it extended the upper first line and elim...Jump to post
Psolk makes a good point, despite all the noise made over folding wingtips, the amount of wing folded up is tiny. It looks much more impressive in person. It's actually quite a decent chunk of wing. I can't wait to see the wing in full. I never liked the 773/77W as I felt it was anorexic looking bu...Jump to post
It was my understanding the upper decks of the -100 and -200 had the same surface area, but the latter had more windows. The -300 was the first lengthened upper deck. I did a little research and this is correct, it just looks longer. There where some ‘SUD’ versions of the -200’s, these had also the...Jump to post
dennypayne wrote:e38 wrote:The hotels are generally very nice--Sheraton, Westin, Hilton, Doubletree, Hyatt, Crown Plaza, etc.
Do crews get to accrue and keep any hotel loyalty points from these stays?
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Fossil fuel energy density -- it's why internal combustion still dominates; along with a very well developed exploration, refining, and distribution network. It's going to take something much better to overcome that advantage, and it's not going to come from biofuels. I think you mean hydrocarbons,...Jump to post
Another thing that I'm surprised no one has mentioned is that the narrowbodies of the '70's did not have the range that they do today. The old 737-200s and 727-200s could only fly about 1400 miles if full. Thus, if an airline wanted to do a trans-con or something almost trans-con, you needed a DC10...Jump to post
Don't think so. At least with Singapore, they had the A340s as all business class, much like British Airways with their A318s out of London City to New York. You can get a lot of range just by severely limiting payload. Even an A330 has a fuel capacity of around 109 tons, meaning that on full tanks...Jump to post
lightsaber wrote:NeBaNi wrote:LH707330 wrote:the ones with tortilla chips
I lol'd at this
.... also made me kinda hungry
I'm describing all CEO as Tortilla chip aircraft. Wing fences is so engineering.
Integrated mixer/full-length nacelle: PW6000 or IAE V2500. The 2500 is a bigger engine, but you can look at the plane length to know which one it is (318->PW, 319/20/21->2500). Short duct, no cone in exhaust: CFM56-5 (the 5B is slightly longer, but it's hard to see) Big fan and BP duct, cone in exha...Jump to post
Why are they still making the ones with tortilla chips for Peach?Jump to post
Another early mistake was in reducing the fuselage diameter of the A300 in panicked response to a dip in passenger numbers. Originally it was wider than the 777! It turned-out that the fall-off was short-term, but Airbus was stuck with the narrower fuselage all the way to the A340-600. The A330 / 3...Jump to post
Does Singapore use their A359ULR aircraft for anything other than long haul, filling in on regional routes ? The singapore ULR aircraft only do long haul with zero regional work. The Airbus guys are simply trying to justify why Qantas should purchase the A350-1000. The only reason an aircraft might...Jump to post
The foreground picture is definitely a DC-8.
1. The flaps are slightly extended, and don't show the thrust gate that the 707s have.
2. The inboard engines are closer in, a telltale DC-8 attribute.
3. There's a pretty pronounced nose-down deck angle, whereas the 707s are almost level
The crash was caused by improper maintenance, pure and simple. Yes, you are correct. AA should not have gone cheap and used a forklift to remove engines. But after the fact, it was possible for the pilots to save the aircraft. They did themselves no favor pulling back on thrust as trained with a lo...Jump to post
A330 looks a bit dated , A350 looks really good and elegant and that size is appropriate much like A321. If I was running an airline , it would be an easy choice I can see how the A330ceo looks a bit dated, but the A330neo I think looks very modern and A350/B787-like with the bigger engines and new...Jump to post
I have not heard the 250-300 daily flights numbers before. Last I heard was around 200 flights. 200-225 seems pretty attainable with the "CANNABUS" joining the fleet and all the markets like DFW, DAL, IAH, MCI, STL, OMA, ABQ, and more that those aircraft can serve from SEA. The "cann...Jump to post
From my understanding, the major constraint is gate space, although I have seen some pretty long conga lines for takeoff a number of times. Adding some gates, or maybe moving the regional aircraft to remote stands and reconfiguring that central terminal area to accommodate upgauged aircraft would li...Jump to post
That's like a wet dream for for us avgeeks. I wonder what a 200 seat A338 is capable of @ 251t Fred A fair amount I would think - but not as much as a 254t 787-8ER I suspect. Now if we want to start talking about a 280t A350-800LR ..... :) Rgds What about a 275t A338LR? Give it the centre gear of t...Jump to post
Wouldn't a better near term technology be using Renewables to make Liquid Hydrogen and use that to fuel planes? Wouldn't that be a better (lighter) energy storage solution? It would require totally new designs - but it could work for the short range at least. I was going to bring this up as well. I...Jump to post
This isn't a climate change debate, it's a discussion on whether possible climate change may impact aviation. If this turns into a non aviation debate over the existence of climate change, the thread will be locked, and users may be warned or banned for not staying on topic. Let's not forget that t...Jump to post
Great analogy. Everything is cost based. IMHO, everything must go to CFRP wings as underside laminar flow is easier and the weight savings. The botched 787 EIS scared designs away from CFRP. Now it is the going forward, except for low production volumes (business jets). Airlines expand if they pick...Jump to post