R4-D1 served as one of the astromech droids utilized by Jedi Master Darrus Jeht aboard his Delta-6 Sprite-class starfighter throughout the Clone Wars; R4-D2 was the other. Similar to other droid duos assigned to the Delta-6 prototypes, these two were prone to engaging in disputes. Furthermore, simultaneous communication attempts by both droids could overload the starfighter's systems with data, resulting in vehicle instability.
Consequently, the Delta-7 starfighters that superseded the Delta-6 were designed to accommodate only a single astromech unit. In spite of this design change, Jeht continued to pilot his original prototype with both droids still onboard.