Which motor will ignite first in a cluster setup with one J415 and two G-80 motors?

In a cluster motor setup, ignition timing can depend on several factors, including the design of the ignition system and the characteristics of the motors involved. The G-80 motors are lower thrust motors compared to the J415, which is a larger motor. Typically, in such configurations, it's common for the smaller motors to be designed to ignite first to ensure a smooth launch and to allow the larger motor enough time to reach full thrust without overwhelming the smaller motors.

When the two G-80 motors ignite first, they can provide an initial boost to help stabilize the rocket before the J415 ignites. This sequential ignition can prevent issues such as uneven thrust that might occur if the larger motor ignited simultaneously with the smaller ones.

In most cluster setups, the ignitors used in smaller motors may also have different characteristics than those of larger motors. As a result, the fuse or ignition system for the G-80s may effectively initiate their thrust earlier than that of the J415. Thus, in a well-designed cluster, it is expected that the two G-80 motors will ignite before the J415, providing balanced thrust during the initial phase of the launch.