V1 vs Vref

[Snoopy58]

Why not just make the runway bigger in the first place, instead of adding clearways and stopways??

$$$
Anybody priced out the cost of pavement recently? Runways are expensive compared to the cost of removing a few obstacles.


V1 involves a decision... before this speed my decision is to stop if I lose one (and I can stop for other things if I need to), but after this speed my decision is to go (unless the plane is unable to fly), even having lost one. In a single, when you lose "one," there IS no decision to be made. REFUSAL speed is still a player, since there are other things you might like to stop for (if you still can) other than a failed engine... until refusal speed you can stop in the runway remaining, after refusal speed you can't. Refusal speed deals with stopping only, and thus applies to a single. But a speed that deals with stopping OR GOING such as V1 doesn't apply to a single.

 

[Loafman]

...in a single, wouldn't V1 = Vr?

I'm thinking if the runway is short enough that you have to make a decision, you had better be airborn VERY shortly after that time...

-mini

This was a rhetorical question.