Surface piercing propellers are manufactured in NiBrAl from: up to 70" diameter with a power range from 600 Hp up to 5500 Hp.
Duplex Stainless Steel ERO and 17.4PH from: up to 28" diameter with a power range from 250 Hp up to 1400 Hp.
Propellers are designed from systematic series based on tunnel testing and permit Rolla to calculate torque - thrust coefficients, efficiency and horizontal - vertical force figures for different shaft angles and propeller immersions.
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Palmer Johnson is an authorized distributor and service provider for Rolla products.
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