V1
What is v1?
V1 is the takeoff decision speed — if an engine fails before reaching this speed, you should abort the takeoff, but at or above V1 you are committed to continuing the takeoff because there is not enough runway left to stop safely.
Studying for an FAA written test?
Terms like v1 show up on the FAA knowledge test. Study them in context with ACS-aligned practice questions, AI explanations, and the cited FAA handbook reference behind every answer — free to start.