R Madhavan, who is starring in 'Rocketry: The Nambi Effect', has taken over as the film's director as filmmaker Ananth Mahadevan had to leave the project due to other commitments. Sharing the news on social media, the actor wrote, "Need all [your] blessings." Based on the life of ISRO scientist Nambi Narayanan, the film will mark Madhavan's directorial debut.