The RT bolted rubber flexible coupling, most often used aft of the gearbox, provides dynamic mobility to a resiliently-mounted engine and minimizes bending stresses in the gearbox output shaft. Additionally, the RT coupling here has significant mechanical and acoustic attenuation, keeping engine and gear noise away from the low-speed shafting and bearings. Dynamic Magnifier values as low as 3.5 can be provided with high-damping elastomer elements.
Bolted-rubber RT couplings – normally used behind reduction gear boxes (as in the Soft-Mount package) to reduce propulsion engine and gear noise penetrating the shaft line, bearings and hull, also to co-operate with the vibration isolators below engine/gear. Carries propeller thrust in both directions.Torque Limiters can be combined with RT or SS couplings to provide a fail-safe shock absorbing/release device for boats operating in ice.