Sea trial data from the Croswait / Bad Company 50, which is fitted with our fully CNC-machined Class S propellers, flow-aligned rudders, and flow-aligned struts for optimum efficiency and performance:
LOA 50
Beam 16
Dry Weight 32,600 pounds- fighting weight 40k
Cruise 30 at 1925RPM. 29 Gal a side
Cruise 31 at 2025RPM 33 Gal side
Cruise 33 2125RPM 37 Gal a side
Top speed 38 knots fully loaded. 45 Gal a side
Trolling 8.5 knots. 700 RPM at 2.7 Gal a side
“With 6 people on board and 3/4 fuel and full water. She hit 39 knots in real conditions and weight. At half load, she will do 40 knots. 33.8 knots at 74 Gal an hour for a 50 footer. .456 NMPG. What a machine. Can’t wait to fish her in Brazil and around the world.”
We’ve worked closely with their teams and our partners Wildcat Propellers to deliver a technically advanced sterngear solution to make this Gameboat the best it can be.
How does a flow-aligned rudder work?
Motor yacht rudders, which traditionally have a straight surface area, operate in a position of uneven water flow directly behind the propellers. As a result, a suction pressure peak can form at or near the leading edge of the rudder. CJR simulate these forces to predict how they would impact the performance of the propulsion system. We use this information to design and craft a rudder blade with a unique ‘twisted’ profile – which is perfectly aligned with the propeller flow angles along the entire span.
What are the benefits of choosing a CJR flow-aligned rudder?
– Up to 2kts increase in speed compared to top straight rudders
– Optimised profile of each rudder delivered through CFD
– Significantly improved propulsive efficiency, with no impact on vessel manoeuvrability or steering performance
– Reduced rotational losses and minimised drag provide the potential to increase top speed by up to two knots
– Power savings provide the opportunity to reduce engine load by up to 3% at the same RPM, in turn significantly reducing fuel burn
– Lower suction pressure peaks to reduce cavitation, noise and vibration, improve both ride comfort and rudder lifespan
– Potential to downsize the steering rams to save weight and cost
– Manufactured to any classification society rules, including all IACS societies
To find out more about how we can help your next project succeed, please email [email protected]