??[sm=confused.gif]?? There is no such thing as selecting a neutral point. The neutral point is a fixed characteristic of an airplane of fixed shape. Or were you talking about designing an airplane to have a specific neutral point location?

As for the calculator, it does not seem to be very accurate. I have an excell spreadsheet I could forward that calculates these things quite well, the only problem being it requires one value to be looked up from a chart. THe chart could be scanned and published, alongside the calculator, I guess.

Of course the chart is from a published stability book, so putting it on the internet may not be the way to go.