HydroComp PropExpert 5.12.0067 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The following versions: 5.3 and 5.1 are the most frequently downloaded ones by the program users.
You can execute this PC software on Windows XP/7/8/10/11 32-bit. We recommend checking the downloaded files with any free antivirus. The actual developer of the software is HydroComp, Inc. The HydroComp PropExpert installer is commonly called PropX5.exe. HydroComp PropExpert lies within Education Tools, more precisely Science Tools.
From the developer:
PropExpert is a software tool for the sizing and analysis of propellers for work boats and pleasure craft.
It provides the tools needed for the proper selection of propulsion system components - engine, gear and propeller - and has been selected as the principal propeller sizing tool of many of the best known manufacturers and distributors of marine engines and propellers.
You may want to check out more software, such as HydroComp PropCad 2005 or HydroComp NavCad, which might be related to HydroComp PropExpert.