If you are making one of these:
I recommend using a spray-lacquer finish if you would like to keep it shiny. If this is left untreated, the copper will quickly oxidize to a patina. If you look at the end scene in this video, the red helicopter on the left was unfinished, because it was made as a prototype a few months ago. Once you are done shaping it, just pop the marble out to spray it. Spraying it at this time will limit the amount of damage to the lacquer finish, because once it is dry, you only need to pop the marble back in, and gently fix it with your hands.
Interesting note about this thing's spinning: You may think that a strong wind would blow it all over the place, but it actually stays quite still and just spins like crazy, especially if it was well balanced. There is a certain property of a spinning object to remain where it is; you may have felt this physical phenomenon from a spinning drill motor, if you've ever quickly moved one from a vertical to a horizontal position. The property that I'm talking about behaves kind of like a rotational inertia. The harder that the wind blows, the more the gyrocopter wants to "stick" to where it is. In formal physics study, this tendency is called the conservation of _______ ________. The answer is beneath, at the end of the list of keywords.
About those little diamonds:
If you are framing something that is 8 feet long, it will require 6 wall studs, if they are on 16" centers. This is because 8 feet is 96 inches, and 96/16= 6. We can also consider it this way: 96/6= 16.
If you would like to save a wall stud every 8 feet, you simply divide the 96 into 5 groups, instead of 6. Thus, 96/5= 19.2. On many tape measures there is a diamond at every 19.2 inches, so that you can save a single stud for every 8 feet.
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