![]() ![]() You will also notice two things: First, it's easy to balance it as long as you work hard on it, and it can very easily tilt to one side, and if it does it falls FAST. Put the endpoint of the handle on your hand, with the brush up, and you will notice that you can balance it. ![]() In other words, your rocket has to be symmetrical to be stable. First, your point of action, actually the vector sum of your thrust vectors, for you nitpickers, HAS to be lined up with your center of gravity. What sounds obvious at first has some implications. Or, simpler put, put the engine behind the mass and thrust in the other direction. So the next best thing we can do is to put that point of action "behind" the center of gravity and point its action vector towards the center of gravity. If it was, that would be sweet, since we could push the rocket wherever and however we want (ignoring air resistance, of course). the point where your engines create thrust. Sadly, this point is usually not the point of action, i.e. That is always one single point in space, and unless you have a very oddly shaped rocket, that point is somewhere inside your rocket. It's the point where, if the rocket was resting on that point, you could give it a nudge and it would freely follow that nudge without gravity having a say, because left and right, up and down, front and back, they're all equally heavy and perfectly balanced on this single point. The center of gravity is the point in your rocket where it would be in total balance. Namely, center of gravity, point of action and how they matter. 7 So, with all that, what IS now the best design?īefore we get into the details, a few physics facts.3 As much thrust as possible to the bottom.
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