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SD Series

• Lowest Maintenance
• Compact Design
• Light Weight Composites 
     - will not corrode
• Highest Propulsive Efficiency
• Exceptional Manoeuvrability
• Very Quiet and Smooth
• Easy Installation

The Q-SPD SD series is now the most  popular of all Q-SPD drive models. It began life as the ideal alternative to stern drives offering a virtually maintenance free solution to the worlds most maintained propulsion system, stern legs. Now, the Q-SPD SD Series is available in eight base models for power options from 150hp to over 2000hp.

Construction of the main structural compnent is by advanced resin infusion techhniques, incororating Eglass and carbon fibre in an epoxy matrix to produce a light weight and structurally very strong drive system. Composite construction reduces corrosive issues and allows easier maintenance and care.

Due to the advanced propeller design, a unique ventilation system, integral thrust bearing and the evolution of the unique twin side rudders, Q-SPD SD series drives are smoother and quieter than any other surface drive. In fact, reports claim smoother than conventional, yet they offer all the performance advantages of a fully ventilated propeller. The twin rudders also offer better tracking, steering and maneuverability at all speeds.

By design, the Q-SPD SD drives are compact in length, which means they do not impose on waterline length like other surface drive systems. They offer shallower draft than most other propulsion options, and can be used in single, twin or multiple applications. They are suited to many hull forms including displacement catamarans and are ideal for both recreational and commercial applications.

The SD Series is avaiable in "Fixed" or "Direct drive" versions. 

• The standard "Fixed" drive version has a 6º main shaft angle and includes an integrated water cooled thrust bearing.  Thrust is delivered to the transom by way of the SD drives interal thrust beraing. Q-SPD also supply intermediate drive shaft options to couple the drive to the gearbox. Both standrads length and custom length intermediate drive shaft options are avaiable.  
• For some models, a "Direct" drive version allows some customisation to the main shaft angle to be preset 2º to 8º and is popular for many applications where engine position does not lend itself to a 6º propeller shaft.  For instance, where engines are mounted further forward.  The direct drive SD can be supplied with a remote mounted thrust bearing and flexible coupling shaft or, depending on the application, the shaft may be coupled directly to the gearbox.   

The Q-SPD SD is delivered as a completely assembled system that mounts directly to the transom. Models SD110 through SD201 are designed for 12º transoms so they are a perfect stern leg alternative. The larger SD275 though SD350 drives mount to a 6º transom angle.  

Q-SPD SD drives should be considered as an alternative to conventional underwater shafts and propellers, where performance and efficiencies can be increased and draft reduced, and also as an alternative to water-jets when speed and efficiency are essential.

See Q-SPD Selection Guide for full range of Q-SPD surface drives models.

See Q-SPD MY Series for vessels from 17 meters and up to 3000hp* 
* Subject to application analysis. 

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