Bingo! http://www.spacex.com/falcon-heavy http://www.spacex.com/falcon-heavy "Shortly after liftoff the center core engines are throttled down. After the side

Bingo! http://www.spacex.com/falcon-heavy http://www.spacex.com/falcon-heavy "Shortly after liftoff the center core engines are throttled down. After the side cores separate, the center core engines throttle back up to full thrust."