With the servos installed, the next construction item is installation of the firewall(s). The most common mounting method for geared inrunner motors uses a pair of mounting structures. The Hyde soft mount attaches to the front of the Neu F3A-1 gearbox, and is mounted on the primary firewall, which is located just aft of the nose ring. The secondary mounting point is a very lightweight circumferential friction fit "tail ring" at the aft end of the motor mounted on tabs or a partial former. The primary task of the tail ring is to limit the shear motion of the motor such that the thrustline is maintained and the motor movement is limited to rotational.
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