Linked Questions

3
votes
1answer
4k views

Why does V1 increase with weight? [duplicate]

(B738 AFM, 0-2000 feet elevation, up to 27°C) Example of V1 increasing with weight. This valid question came up the other day here in chat. The heavier the aircraft, the harder it is to stop. So ...
0
votes
0answers
50 views

What is the significance of the V1 ground roll of an aircraft? [duplicate]

What is the significance of a V1 ground roll of an aircraft trying to take off? Why is minimum ground roll is measured in feet? What is the significance of VR (which is greater than V1 but less than ...
37
votes
2answers
14k views

What do jet pilots say during the takeoff as they are speeding down the runway?

I was watching a documentary on youtube and the pilots always say something that sounds like "B1E" when they have enough speed to take off. What exactly are they saying, and why do they say it?
10
votes
2answers
2k views

Why is the main landing gear of the Cessna Caravan placed so far forward?

Why is it that the rear landing gear of the Caravan is placed so far forward? I understand that the center of gravity must lie somewhere in the middle between the nose gear and the rear gear but ...
11
votes
2answers
12k views

How can V1 and VR (rotate) speeds be calculated?

I want to learn about how can the V1 and VR (rotate) speeds be calculated for take off. And which factors are affecting this calculation? Basically it may depends on the aircraft weight, runway ...
11
votes
3answers
2k views

Can a Boeing 747 take off fully loaded on 3 engines?

Recently a Boeing 747 aborted a take off while still on the ground due to the failure of one engine. Can a Boeing 747 take off fully loaded on 3 engines?
7
votes
2answers
999 views

Could an aircraft like a Boeing 777 take off with flaps fully deployed?

I have wondered this for years. Could an aircraft successfully take off with the flaps fully extended to the landing position? To make this more concrete, let's say a B773-ER at ATL runway 8R.
3
votes
2answers
2k views

Is it possible to have V1 greater then Vr?

According to wikipedia, decision speed ($V_1$) is computed taking into account the runway length (and other parameters). If an aircraft uses a long runway (one listed here), there may be enough runway ...
6
votes
1answer
3k views

In Raymer diagram “Take off parameter- Take off distance”, what is the difference among “balanced field length”, “over 50 ft”, “ground roll”?

Raymer in his book suggests a method to find wing loading W/S (for example we consider jet with 2 engines) (starting from specific thrust $\frac TW$, $CL_{to}$, density/reference density etc.). In ...
3
votes
2answers
1k views

What makes V1 one or two knots less than Vr on this performance table?

(B738 AFM, 0-2000 feet elevation, up to 27°C) Example of V1 and Vr differences. The table shows that the V1 speeds are invariably one or two knots lower than their matching Vr speeds. Given that V1 ...
5
votes
1answer
608 views

What's the pilot's typical reaction time to co-pilot's callouts?

How long does it take on average before a pilot initiates an action in reaction to a co-pilot's callout? Are there any research data on this subject? I'm asking this question in relation to the V1 ...
1
vote
1answer
284 views

Why can’t takeoff rejection be automated?

According to this comment on my previous question about automatic instrument takeoffs (or, rather, the lack thereof), the reason takeoffs are always flown manually is to allow the pilot to quickly ...
1
vote
0answers
159 views

How are the takeoff V speeds calculated? [duplicate]

What is the actual formula for calculating the takeoff V speeds of an aircraft with any configuration? Specifically, I mean V1, Vr and V2 I know there are many factors, but what are they specifically ...