Linked Questions

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Is there a way to approximate the best glide speed for maximum glide distance in a headwind during flight? [duplicate]

Flying at an airspeed corresponding to an aircraft's maximum glide ratio in calm air will maximize the distance covered for a given altitude (AGL). But in a headwind, the horizontal velocity would be ...
50
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4answers
9k views

Why are many jet aircraft designed to cruise around FL350-370?

If the flight distance permits, the B737-800 will cruise at FL350, the A320 a little bit higher... Flying at FL370. Photo: Live from the Flight Deck by GolfCharlie232 (reframed) Elements such as ...
34
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7answers
8k views

Why are jet aircraft never designed with a slower cruise speed?

All jet airliners have a cruise speed between Mach 0.82 and Mach 0.85. At those speeds the aircraft are flying at their maximum subsonic speed. Any greater cruise speed would only be ...
17
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4answers
2k views

Why does the U-2 Dragon Lady not have swept wings?

Swept wings increase the critical mach number for aircraft with otherwise identical wings (Source 1). The U-2 Dragon Lady is limited in altitude by its critical mach number, as it needs more speed in ...
7
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3answers
2k views

What is the relationship between power and fuel efficiency?

We were having a discussion in our ground school that power will make the plane ascend or descend and that you use the stick for speed, forward for higher speed and back for slower speed. So does that ...
8
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2answers
2k views

Why wasn't MH-17 flying at 33,000ft before it entered Ukrainian airspace?

I was looking at the path of the MH-17 flight that crashed in the Ukraine on FlightRadar24 and noticed it was flying at FL310 (31,000ft), then because of the Ukrainian NOTAM which went up to FL320 (32,...
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3answers
3k views

Do some light sport aircraft have clipped wings to lower their cruise speed?

Light sport aircraft may have a max airspeed in level flight at MCP of 120kts. I have heard that there are some light sport aircraft that have had their wings clipped in order to have a lower cruise ...
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2answers
16k views

Why has the maximum service ceiling of Boeing and Airbus products remained about the same for 30 years? [duplicate]

When Boeing introduced the 747-100 in 1969, its maximum ceiling was 45,100 feet; half a century later, when Boeing introduced the 777x, its maximum ceiling was 43,100 feet. Similarly, the maximum ...
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5answers
1k views

Do aircraft use the majority of their fuel to overcome friction?

It was asserted (tangentially) in this question that airliners use most of their fuel to overcome frictional losses. Is that a true statement? If so, ...
12
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3answers
11k views

What is the wing angle of attack of a Boeing 737 in cruise?

I would like to know the angle of attack that a 737 flies at during cruise. I am specifically interested in the wing angle of attack (if you know the cruise nose-up attitude and the wing incidence ...
3
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5answers
3k views

Is (L/D)max achieved at a specific speed or AOA?

I'm little bit confused about the (L/D)max. So I've read this blog: https://joeclarksblog.com/?p=4155 and the author shows this graph: So if I understand it ...
9
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2answers
2k views

What is the one-engine-inoperative maximum range flight configuration?

I was talking with a friend about what things would happen if you experienced engine problems in cruise. We were wondering the following: What things would need to be changed to arrive in the optimal ...
7
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2answers
1k views

Why do airliners on autopilot climb during cruise?

Several years ago I was a passenger on a near cross-country flight when the pilot came on the PA and announced that we were climbing towards our cruise altitude, on autopilot, and as our fuel load was ...
5
votes
2answers
8k views

How far can Boeing 777-200LR fly?

The diagram shows the B777-200LR Payload/Range for 0.84 Mach Cruise (P.41 of Source) The maximum payload range is around 7600 nmi, and after that payload have to be reduced in order to increase range....
4
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1answer
1k views

How can you find the best altitude for range or speed?

How can you select best cruise altitude (altitude for best range velocity) and maximum speed altitude? The specific case is a turboprop aircraft of gross weight 8000 lb.

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