sr243 wrote:Just wondering how is a square base more resistant to tipping over? I don't have a jig or materials/time to make one. For squares, I have trouble making it all even and perfect sides because the sides tilt inwards.
Square base has larger area at the base and symmetrical on the two perpendicular direction, while rectangular base is wide on one dimension and much thinner on the other dimension at the base. The thin side is more susceptible to tipping because any slight slanting or leaning error on the thin direction is greater in proportion to the displacement of the base than it would have been if the base was not that thin. Imagine if you were standing straight with feet closed together and got pushed from the side versus you crouch down a little bit with feet apart to the side, which arrangement is harder to be pushed over? To combat that, you try not to build straight up on the thin side, you need to spread the base apart a little bit and lean the 2 sides in such a way that the tower gets slightly smaller and smaller towards the top. Also try to be as symmetrical as you can which means a jig in the middle to clearly align the two sides is probably a good idea.
This video should help with jig for square base: http://www.youtube.com/watch?v=KOpP7cLvcdk