Once you get to a certain level of scale modeling, you’ll start making parts that need to be produced in multiples and may not be commercially available. This is most easily dealt with by making a single “master” part and then reproducing it with a mold and resin-casting liquid. Resin-casting is considered an advanced modeling technique, but you’ll be surprised by how easy it is to do if you know the proper materials and techniques to use.
The dummy rotary engine I installed in my giant-scale Fokker Triplane is available from Nick Ziroli Plans (ziroliplans.com), and just like all other parts of a scale model, the finer details are what make it look realistic…
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