These are the core 3D model files that define the shape and structure of the oil pumps.
Bitmap files (.bmp) that provide the visual "skin" of the machinery, including metallic weathering and industrial colors.
The file is a legacy digital asset package, most commonly associated with the Microsoft Flight Simulator series (specifically FS2004/FS9 and FSX). It contains a collection of 3D objects designed to represent oil well pumps, often referred to as "nodding donkeys," which virtual pilots and scenery developers use to add industrial realism to the flight simulator environment. Composition and Purpose The package typically includes:
The longevity of speaks to the collaborative nature of the flight simulation community. Because the objects were often released as "library objects," they could be called upon by hundreds of different scenery projects without each developer needing to recreate the model from scratch. Even as technology has shifted toward modern platforms like MSFS 2020, these legacy zip files remain archived on sites like Flightsim.com and AVSIM as foundational building blocks of digital aviation history.
This file usually provides credits to the original creator (often credited to Ron Wallace , hence the "RW" prefix) and instructions for placing the objects using scenery design tools like EZ-Scenery or Instant Scenery. The Role of Custom Scenery