New SB-23FH Muffler for the YS120SR

This tuned muffler has been designed and produced exclusively for the YS120SR. In the 13,000-16,000 rpm Maximum power is available. When the engine is set for 16,000-16,500 rpm during cyclic load conditions the engine will hold the intended rpm.

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New SB-21FH for the OS SPEED 91HZ-R 3D

These tuned mufflers have been designed for increased torque. We recommend tuning your rotor speed and gear ratio to the following rpm range (OS 11,000~14,500 and for YS 12,000~ 15,500). This is also the preferred rpm’s to use during heavy cyclic and collective loads as in 3D flight. Torque will drop off after 15,000 rpm OS and 16,000rpm for YS. The NEW SB-21 FH is designed for the OS 91 SPEED HR-Z 3D and has no pressure tap.