Announcing the "Propeller Design Library" for 3D printing

I've been travelling for the past few weeks during which time I haven't had access to my prototyping machines (3D printers). So I've taken a few weeks off from working on the Open Swift project (now called OpenRC Swift). However, I've been spending some of my downtime working on some Python code, using the Blender API, to auto-generate propeller geometries for 3D printing. I'm looking forward to getting back home to print one of these out.


This film discusses an early flying wing design from the 40's, the YB-49. Flying wings tend to have lower wing loading and have higher flying efficiencies. So they can carry more weight or flying longer distances then traditional tube designs..

Aerodynamics: Airfoil Camber, Flaps, Slots Slats & Drag: Smoke Lifts

This is some neat smoke line wind tunnel testing footage of airfoils with camber, flaps, slots and slats performed at NACA Langley Research Center in 1938.

New prototyping machine

I've received my Printrbot Go Large and have been printing and experimenting with its giant build surface and triple extruders. Many thanks to Brook Drum. I think he'll like the flying wing design I'm producing. I'm going to host my Go Large Slic3r configuration for peer review and to help out new Go Large users.

The Diffuser - Turbine Engines: A Closer Look

An interesting video about air diffusion in a jet engine between the compressor and combustion chamber. This guy's has an interesting YouTube channel dedicated to jet engines. They even have an Orenda Iroquois jet engine which they are restoring.

Defining a direction

Circuit Grove is currently a multi-disciplinary engineering blog and resource. I'm sort of trying to bridge the gap between the engineer and the hobbyist. I've recently taken on an aerodynamics project in exchange for a 3D printer: designing a mostly 3D printable flying wing using traditional balsa/ply construction techniques. I'd like to revisit the Ducted Fan Design Library after; I find turbomachinery fascinating.

An open source 3D printed airplane for FPV, UAV and R/C

I've been experimenting with ways of 3D printing an RC airframe using a hobby printer. I had already tried to 3D print full airplane parts with skin and all and failed. I was following suit with a handful of other 3D printed airframe examples, but unlike their university student designers, I don't have a access to pro grade 3D printers. My desktop PLA printer just can't do produce large enough parts without warping or splitting them up. Plus a plastic skin adds a lot of weight.

3D printing an RC airplane using traditional building techniques

Photo 1: First tests of using a built-up model airplane construction techniques with 3D printed parts.

FDM printed MAV airframe

I love seeing new FDM 3D printed airframe designs. The wing in this video flies beautifully as a slope soarer. The wing's skin is ABS which must give it quite a bit of weight. The advantage of a fully FDM airframe is manufacture is very simple, requiring single raw material. Check out their website.

OpAmps Explained - What is an Operational Amplifier?

I really liked this EVVblog. Dave has a great educational style. Keeps a good pace. Check out his website:


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