>There is hardly an aircraft that has a "single" tank. Even>Cessna 172 has two. So probably you meant "without refueling".Couldn't you just answer his question without the condescending attitude? I think that you knew perfectly well what he meant to begin with. But now that everyone is impressed with your superior knowledge we can move on. Sheesh!

>I think that you knew perfectly well>what he meant to begin with. Believe or not I did not. Hard to comprehend, ha ? Maybe you would stop your condescending attitude for a change. Michael J.

737-700/747/757/767/777/A330/340/DC10/MD11

Ahhh, great one of superior knowledge, ha!Incase you never knew, a aircraft is more fuel efficient at high altitudes. So i have to agree, altitude does matter. Next time, read and think, instead of read and respond. You will spare many people grief.

This is a tough one, but I think I can do it!!!

>Believe or not I did not. Hard to comprehend, ha ? Maybe you>would stop your condescending attitude for a change. Nope, I choose not to believe you. It's not hard to comprehend at all. Your arrogance is plain for all to see.Now you can have the last word.

Who mentioned anything about altitude? Maybe YOU should "read and think."

Ok, i just went from New York to California with the 7E7-800, but i just barly made it. I was at FL380 (38000 ft), i know i had some headwind, but i notest one thing, i had the autopilot set to go 350KIAS, but it going under 200KIAS, and almost stalled once, the throttle was all the way up, but still, only under 200KIAS, this happend at FL380, what am i doing wrong?is it because of the head-wind? i used the real world weather, for today at aprox. 12PM EST.A good anwser to this question would help me out a lot!Thanks.

You're looking at your "indicated airspeed" which decreases with altitude because the air is less dense. Pop open your GPS and have a look at your groundspeed.Jim

This is a guess, since I don't know the specs of an aircraft that doesn't exist yet... but you were flying too high for your weight, probably full of fuel it shouldn't be up at FL380

Hello,Yes, i know my ground speed was 360 Knots, but yet the KIAS was less than 200. What causes a stall? isnt it the Indicated airspeed, or is it the ground speed? i think its the indicated, because at 200kias, the jet had to keep a pritty good noise up attatude, to keep it at 0 vertical speed.I guess my question is, what is a good KIAS to use when at a high altitude? is FL380 too high? if so, what FL should i use? any info you think i should know, please tell me. Also, what speed and altitude should i use for best fuel efficiency?Thanks!

> I guess my question is, what is a good KIAS to use when at a high > altitude? is FL380 too high? if so, what FL should i use? any info > you think i should know, please tell me. > Also, what speed and altitude should i use for best fuel efficiency?

It all depends on the airplane, as the 787 is not done, you will have to look at the docs that came with that airplane. I'd recommend trying out another airplane, one that is in service, and one easily found online with specs

something is wrong...that plane is designed for atleast 4500NM atleast if i remember right.

my apologies... misread a word.but i still think the comment on his knowledge was over the side. I admit to my mistake and apologize, but think that yours was also over the side.