Re: Another Airbus down ....

Brian Reay wrote:
> "Yeti" <yeti@ayrshore.com> wrote in message
> news:h2gbk3$cr8$1@news.eternal-september.org...
>  >
>> You've misunderstood the point - once you've made it to V1 - you take off,
>> no matter what. Unless you reach Vr, and it fails to rotate... in which
>> case the technical term is "f***ed".
>
> If you can't reach V2, how do you achieve flight?
>
> In a multi-engined a/c, the V1 is highest speed above which the plane can be
> stopped on the runway, it is also the speed at which (even if there is a
> critical engine failure) you can still safely achieve V2 IF you have engine
> power from the other engines.
>
> However, in a single engined aircraft, the latter part of that is rather
> optimistic- if the engine goes you will not keep on accelerating. In a
> multi, the remaining engine(s) should allow you to reach V2. However, if you
> don't, won't be flying.
>
> Vr is the speed at which the nose wheel can be lifted.
>
> I expect you, and others, have been Googling. Trying looking at the official
> definitions of the V speeds and then thinking about the physics.
>
> --
> 73
> Brian G8OSN/W8OSN
> www.g8osn.org.uk
>
>
>
>
>

Yes, if the engine failed between V1 and Vr on a single engined plane,
you'd have reached the "f***ed" stage and have to run off the runway.

Although given the incredibly short take-off run of the PA28 I've flown
and the massive runway at Prestwick, it's not something I've ever
worried about.

On the other hand, any airliner has at least 2 engines, and once it's
past V1, you take off.

V2 is the minimum speed at which the aircraft can maintain a normal
postive climb with one engine disabled.

On some aircraft, V2 is lower than Vr.

I think you're confusing it with the unstick speed. (Vmu), which is the
lowest speed at which the aircraft can become airborne.
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