In my brief time here, I have become a great fan of the Scale Calculator. (I was tiring of having to work out formlae every time I used Window’s Calculator and even considered learning enough Excel to design my own.) Especially useful are the UpDown and unit conversion features. However, like any wonderful thing, I want more, MORE!
It does two sides of the scale triangle really well. Given Prototype and Scale it calculates Model. Given Model and Scale it calculates Prototype. BUT given Prototype and Model it can’t calculate Scale - yet.
There are times when deriving Scale can be really useful: e.g. I have Bachmann’s Emily and a book full of specifications for the many versions of Stirling’s Single, but Bachmann hasn’t published a scale I can find. So when trying to order detail parts from UK, it would help me to know what scale I am seeking. Working from the driver diameter, I get close to 1:22.78 which could involve micrometer error. It would help me to compare several other known dimensions to zero-in on the model’s scale. Once I was more sure of this, I might then work with other dimensions to determine which of the various 8’ Single series is closest to the model.
This won’t make me a better modeler, but it could propel me into a superlative rivet counter. (You owe your fellow hobbyists that.)
I hope I have shown there can be uses for this third side of the calculator triangle. You being The Power That Be, would you please influence the Calculator designers to add that feature. Those who are about to have their rivets counted will be forever in your debt.