Resistance and Powering Design

How big to make the engine?  That innocent question reveals a complex field of study.  Resistance and powering require multiple methods of calculation to obtain an accurate prediction for engine size.

This typically consists of two stages:

  1. Resistance estimate
  2. Propulsion design

Regarding resistance estimates, DMS has multiple methods available for a range of accuracy and budget needs.  

Propulsion design consists of selecting the best propeller size.  This requires determining the blade pitch, blade area, and other geometry features.  The ultimate goal is peak efficiency, but the engineer must also consider cavitation, vibration and noise, operational profile, engine matching, and several other factors.

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