What does the sequence V1, VR and V2 mean on takeoff?

Answer 1

V1= Takeoff decision speed.
Below this speed, you can abort your takeoff for whatever reason and be able to stop on the remaining runway.
VR= Rotation speed.
At this speed, you rotate (you lift the airplane's nose off the ground and transition to a climb pitch attitude).
V2=Single engine climb speed.
This is the speed you climb out at if you lose an engine after V1.

All of these speeds are dependent on aircraft weight, airport elevation, density altitude (airport elevation +/- corrections for temperature and atmospheric pressure), wind, runway conditions (runway slope, contaminants such as snow, ice slush, standing water),etc.

Answer 2

Most of these explanations are correct, so I thought I would add something to the conversation.

The reason pilots use "V" speeds is because they change for every flight and every aircraft. Sometimes it is a subtle change, one or two knots but other times it is greater. The idea is that you have two pilots in most of today's complex aircraft. One pilot will fly the aircraft and the other pilot will monitor the status of the systems.

At take-off the pilot flying will be paying attention to where the aircraft is on the runway and watching for traffic and anything else of concern. In order to make life a little easier, the pilot monitoring will watch the airspeed indicator and make the following call-outs (in most aircraft):

80 knots - the pilot flying will actually glance down to make sure his airspeed indicator agrees. If not, they have to stop.

The next call out is V1. This lets the pilot know that he has reached the point of no return. As a side note, the pilots will have had a discussion about what to do if there is some sort of emergency after the V1 speed.

VR is rotation. Sometimes they will call out "VR" other times they will call out "rotate." The pilot flying pulls back on the yoke and away we go.

V1 as mentioned previously is the speed at which we can still maintain a climb after losing an engine.

Hope that adds value to the other answers!

Answer 3

This Site Might Help You.

RE:
What does the sequence V1, VR and V2 mean on takeoff?

Answer 4

V1 Vr V2

Answer 5

V1 is Refusal or "GO" Speed, also referred to as Vr is some cases, Military. It is the max speed you can accelerate to, loose and engine and stop on the remaining runway.
Sometimes referred to as the point of no return.
V2 is also referred to as Vrot or Rotation speed. It is the speed as which the aircraft can fly and is rotated at takeoff.
There are many other performance factors and speeds associated with takeoff performance. Just a few are:
VMCG - Minimum Ground Control Speed
VMCA - Minimum Air Control Speed
VMCO - Minimum Climbout Speed
VMFR - Minimum Flap Retract Speed
2Eng - VMCA Minimum Air Control Speed with 2eng out on same side.
There are many more, Would take days to explain all and their relationship to each other.

Answer 6

jrc's answer is the correct one. That is what we use at our airline and at all of the ones that I have jumpseated on. Just to reiterate:

V1--Takeoff decision speed.
Vr--Rotation speed.
V2--Speed that you climb at if single engine until you reach the acceleration altitude.

Answer 7

v1 is when u can abort a t/o have enough runway left or put the plane back down with minium forward energy, VR is at which speed the plane will rotate for take off . V2 is the speed which the aircraft will climb if it loose an engine and still out climb out and return to land safely

Answer 8

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Answer 9

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Answer 10

This isn't a bad reference for all the V speeds.
http://en.wikipedia.org/wiki/V_speeds