Ground-adjustable Arplast modular propeller on ARV Super2 Modular propellers may be fitted to aircraft as well as boats.Such as the aviation Arplast Helice ground-adjustable propeller. The benefits of a modular propeller are that its specifications (such as blade pitch or propeller diameter) may be altered to suit varying conditions; and it becomes much easier to replace damaged elements, such as a broken blade. Traditional one-piece propellers may be professionally modified to change the blade pitch, but this is not a common or easy option. In contrast, a modular propeller allows changes to be made quickly and easily.Engineering News - URL A modular propeller may have, for instance, a metal hub but composite blades. One patent application has defined a modular propeller thus:  "A modular propeller comprises a center hub with an integrated front cap and an aluminum core encapsulated with fiber-reinforced composite polymer resin. A set of replaceable blades have bases that slip into and interlock with corresponding slots in the center hub. An elongated rear cap retains the blades in the center hub. The rear cap includes a nozzle section for expelling exhaust gasses that pass through the center parts of the hub and blade bases". Patent application -Stahl, B. patent 2006
Ground-adjustable Arplast modular propeller on ARV Super2 Modular propellers may be fitted to aircraft as well as boats.Such as the aviation Arplast Helice ground-adjustable propeller. The benefits of a modular propeller are that its specifications (such as blade pitch or propeller diameter) may be altered to suit varying conditions; and it becomes much easier to replace damaged elements, such as a broken blade. Traditional one-piece propellers may be professionally modified to change the blade pitch, but this is not a common or easy option. In contrast, a modular propeller allows changes to be made quickly and easily.Engineering News - URL A modular propeller may have, for instance, a metal hub but composite blades. One patent application has defined a modular propeller thus: Patent application -Stahl, B. patent 2006 "A modular propeller comprises a center hub with an integrated front cap and an aluminum core encapsulated with fiber-reinforced composite polymer resin. A set of replaceable blades have bases that slip into and interlock with corresponding slots in the center hub. An elongated rear cap retains the blades in the center hub. The rear cap includes a nozzle section for expelling exhaust gasses that pass through the center parts of the hub and blade bases". 
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Patent application -Stahl, B. patent 2006
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Patent application -Stahl, B. patent 2006