But if you have an NXT version, you can use this gear wheel. If you have an EV3 version, you will have to go with a smaller base. So, we can use a part available only in the NXT version. But the problem is not only to improve the stability of the robot but also to make it turn freely at a random degree. Now we can connect the catapult to this larger base and probably we will improve the stability of the robot. If I attach some of the frames like this, I will have a larger frame. For example, I've prepared this construction which is very simple. So, we can find different ways to attach these frames and increase the surface of the base. A good way to enhance the base of the robot is to use these frames available in the EV3 version of the robot and in some of the newer NXT versions. Probably if the brick is heavier it might even fall. With our construction from the first video you can fire small Lego parts and, as you can see, the whole construction isn't very stable when firing. Now let's think about the problem for a moment. In this video I will show you how to improve the stability of the base and in the same time achieve this free turning of the catapult. The catapult uses only gravity forces but it was not very stable. In the first episode of the series I showed you how to construct your own catapult, the base, the frame, the nest that holds the brick and the lever that fires the small Lego parts.
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