I was Doing some plane concepts the other day and realized i kept falling back on certain things .A hinge works like this .A vent looks like this. A pipe attaches like this.I was finding it wasn't looking very convincing to me and it didn't give me allot of variety to" jam" with in whence to kick forth.
My idea at that point was to try and add to my Brain library .I gather up a heap of reference and just redraw what was there in front of me .I found the shapes can look like a big mess but allot of the times your forcing your brain to conjugate what your looking at which was pretty cool .The more you understand how something works the better you can twist it and still have it look good. The vocabulary of an engine tends to be intake /exhaust /thrust and if you can describe these in a new way or specify how it works better in your image than you will probably have something people will like and relate to .
Since i did this study i have not yet gone back and tried more plane concepts but i do know i put a few more things in my brain Library and this is a good thing.