Back in the late 80s and early 90s, I was one of the people that created the kind of design program many of you are talking about. Some people developed these into commercial computer software... "Auto-Design" programs, if you will. I've seen a few advertized since that time, in various magazines, but haven't used one.

Developing my own software finally got me to the point that I could input 2 simple parameters, such as "type" (Pattern, Fun Fly, etc.) and "span", and the computer would then calculate the desired proportions, CG placement, engine required, and a very long list of other details, from which a design could be built. (This was done on an ancient Sinclair QL computer, and I no longer have either the computer or software.)

But...If you can spare a weekend, you can create your own. Here's how:

The process can be done by using a (large) spreadsheet. Simply start entering data into the spreadsheet for each type of design you like, using proven measurements. Do this for different types, different scales, and so on. I would enter the data for at least 15 or 20 aircraft of each type and scale that you're interested in. Specs for most models are published in catalogs, magazines, and on various web sites. Finally, take the averaged results of all this math, and create input-related "forumlas" on another spreadsheet.

Eventually, you can create your own customized "Auto Design" spreadsheet, which will, based on the inputs you provide, spit out what you need to start drawing. It's tedious, but can be created in a couple of days of dedicated work. If you consider the end result, that's really not much time to spend. As you design and build your own planes, keep collecting performance data, to refine your results.

This cookie cutter approach has only one real drawback, which is that we keep designing the same kinds of aircraft over and over, with only small cosmetic differences. The parameters would have to be editable, to allow for new construction materials, engine technology, and radio technology, which can affect performance greatly. While it's true that we shouldn't waste our time re-inventing the wheel, I would like to see some NEW concepts explored, and am always tinkering with ideas to see what happens.