News - 08.03.2018:
I added a slightly modified front dummy engine, R-2800-04, which has a slightly larger inside diameter for better motor clearance.
News - 21.02.2018:
Added a backside for the radial, and a part that works as a second bank behind the first bank of cylinders. The backside can be added to the second bank piece as well and it's possible to assemble as many banks as desireable behind the original front bank of ylinders.
Semi-scale model of Pratt & Whitney R2800 radial engine for rc model airplane use. Way more convincing than vacuum formed dummy engines.
Designed for my 1:7.5 scale RC ESM F7F Tigercat.
Diameter: 166 mm.
Inside cavity large diameter: 61mm - 57 mm inside the joiner ring.
The model can be scaled up or down to fit your model.
For personal use only, not for resale.
I recommend printing with no infill for reduced weight.
I recommend 0.2mm layers up to 23 mm height and 0.08 mm layers above 23 mm height for quick print speed, and good quality.
Two outlines is enough.
No support is needed. The pushrod tubes require decend bridging performance to come out as good as the photo. They can easily be trimmed if they don't come out perfect though.