uwochris
Flightinfo's sexiest user
- Joined
- Dec 21, 2001
- Posts
- 381
Hey guys,
Here is a question from an ATP workbook:
Which of the following factors will increase V1 speed:
a) increase in weight.
b) reverse thrust capability.
c) snow/slush on the runway.
d) an increase in tailwind.
The correct answer is "a." When I try to think about it, it doesn't really make much sense to me- for instance, given a specified runway length, a heavier a/c will require a higher Vr and will use up more distance for the takeoff run. Since V1 is the maximum speed where the pilots must take action to stop the a/c within the LDA, it would make sense that a heavier a/c would need to take such action sooner in the t/o roll in order to stop within the specified distance (i.e. heavier a/c=more momentum=more distance to stop). This seems to imply that the decision to stop/continue should be made sooner in the t/o run, meaning a lower V1 speed.
What's wrong with my logic?? Also, is it true that any factor affecting your takeoff distance (weight, runway slope, temp, pressure, etc) will also affect your V1?
Thanks in advance,
Chris.
Here is a question from an ATP workbook:
Which of the following factors will increase V1 speed:
a) increase in weight.
b) reverse thrust capability.
c) snow/slush on the runway.
d) an increase in tailwind.
The correct answer is "a." When I try to think about it, it doesn't really make much sense to me- for instance, given a specified runway length, a heavier a/c will require a higher Vr and will use up more distance for the takeoff run. Since V1 is the maximum speed where the pilots must take action to stop the a/c within the LDA, it would make sense that a heavier a/c would need to take such action sooner in the t/o roll in order to stop within the specified distance (i.e. heavier a/c=more momentum=more distance to stop). This seems to imply that the decision to stop/continue should be made sooner in the t/o run, meaning a lower V1 speed.
What's wrong with my logic?? Also, is it true that any factor affecting your takeoff distance (weight, runway slope, temp, pressure, etc) will also affect your V1?
Thanks in advance,
Chris.