Bringing back an oldie........ This thread started over two years ago......... kewl...............

What Bax said 2 years ago is still true. The part about a bunch of compromises especially.

There are a bunch of formulas that the aerospace industry uses every day. A bunch of them are put together in the www.geistware.com application that does CG placement. And the aerospace industry uses those same formulas to do redesigns as well as designs. And you can too. Just using the application itself but with a different purpose.

Work out your measurements just as if you were going to look for the CG of that model. And do the app twice to find the safe range for the CG locations. Now, change the numbers you started with. Change the tail numbers the way you think would make your pylon racer faster. Plug those numbers into the geistware app and see where the CG goes. Where it goes and what the new CG range is after the hack job will give you a really good idea if your new smaller tail will work or not.

It's exactly what designers do.