Calculate replacement propeller pitch, diameter, speed, and slip for Michigan Wheel Vortex, Apollo, and Ballistic series props.
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Michigan Wheel is one of the world oldest and most widely distributed aftermarket marine propeller manufacturers. This calculator assists boaters in evaluating Michigan Wheel Vortex (die-cast aluminum), Apollo (high-polish stainless steel), and Ballistic (high-performance tapered leading edge) propellers to match engine operating RPM and reduce slip.
V = \frac{\text{RPM} \times P}{\text{Ratio} \times 1056} \times (1 - \text{Slip})Michigan Wheel stainless props (Apollo and Ballistic) typically experience 2% to 4% less slip than aluminum Vortex models under heavy acceleration due to reduced blade deflection.
Scenario: A sterndrive cruiser running a 14.5 x 19 Michigan Wheel Apollo stainless prop at 4,800 RPM with a 1.98:1 Alpha One drive running 37 mph.
Theoretical Pitch Speed: (4,800 × 19) / (1.98 × 1056) = 91,200 / 2,090.88 = 43.62 mph.
Speed Loss to Slip: 43.62 - 37.00 = 6.62 mph.
Slip: (6.62 / 43.62) × 100 = 15.18%.
The XHS (Exchangeable Hub System) is a modular drop-in Delrin sleeve hub designed to absorb impact shock from underwater debris, protecting your lower unit gears from catastrophic damage.
Apollo is an all-around performance stainless propeller for runabouts, pontoons, and offshore boats. Ballistic features high rake angles and aggressive tip cupping designed for lightweight high-speed hulls.
Yes. In addition to outboard and sterndrive props, Michigan Wheel manufactures Dyna-Jet, Federal, and Gold-Series heavy-duty bronze and NiBrAl propellers for commercial and recreational inboards.
Yes. Minor bends and nicks in both aluminum and stainless steel Michigan Wheel propellers can be professionally re-pitched and balanced by certified marine propeller shops.
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