Standard propellers have fixed blades, meaning, whether they are in use or not, they blades are still extended.
Feathering props turn the blades. That way, when not in use they can be turned sideways to the flow of water.
Folding props, as the name suggests, fold the blades down when not under power.
Reversing props fold down and then reverse the blade so that the leading edge is always used in forward or reverse.
Brunston's Eco*Star Reversing propeller
The Eco*Star is known for its regenerative capabilities. Since we have two electric motors, both using regeneration, this is critical. But that is not the only reason we went with this choice in props. Since we have one Parallel Diesel engine/electric motor, and the diesel engine needs to run at a faster RPM while the electric motor will run at a slower RPM, we needed a prop that would automatically adjust the pitch based on the RPM so that both engine and motor using the same prop are efficient when powering the boat. The Eco*Star is that prop.
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