Book 8, Question 76
Why Do Rockets Turn and Roll Shortly After Liftoff?
Rockets turn and roll after liftoff so they can head in the right direction for their orbit! Soon after liftoff, many rockets twist around their long axis in a roll program. After that, they tilt over and arc toward space.
More fun facts
- A rocket's roll axis runs straight down its center, from nose to tail.
- A rocket can roll by swiveling, or gimbaling, its engines to push a little to one side.
- Engineers call a rocket axisymmetric because it is the same all the way around its roll axis.
- About 80 to 90 seconds after liftoff, rockets like the Falcon 9 pass through 'max q,' the moment of greatest air pressure on the rocket.
- Max q happens between about seven and nine miles up.
Sources: NASA, NASA, National Geographic
Questions kids ask
What is max q?
It is the point in a launch when air pushes hardest on the rocket.