We updated our Spinosaurus robot. Our robot started swimming smoothly. Special thank to many of you make us comment and information. Incl. 中島保寿（古生物学者）

@japanfossil I think a very important part to understand how spinosaurus swimed is that it's bones are very dense, so dense that i'm pretty sure it would sink and swim like an hyppo (walking along the seafloor). I'm not sure if there is a study confirming that Spino is denser than water tho

@japanfossil That's neat, I'm glad you got it working well. Are the feet webbed or mobile in the swim cycle? I feel like that would be significant at slower/trolling speeds.

@japanfossil This robot does not currently have webbed feet. We have confirmed that it can generate a certain amount of propulsive force in the water by kicking its hind legs, but currently this is only effective for walking on the bottom of the water and for kicking to rise to the surface.

@japanfossil It looks good. Thanks for taking another look at this project!

@japanfossil Wicked

@japanfossil I doubt it swam like this. Too big, buoyant and unstable:

@japanfossil Thank you for your comment. As you pointed out, when the sail was fully extended, this robot did not dive and did not swim well. On the other hand, when the buoyancy was lowered until the sail was half extended, it suddenly started to swim well.

@japanfossil Just checking out if there is a argument in the comment section about this depiction of Spinosaurus (Obviously it looks like this just kidding your model is accurate)

@japanfossil Thank you for introducing this fun reproduction idea. Judging from the shape of this child and the state of the tail bone, if it is made into a robot as it is, it seems that it will not be able to dive, and if it can dive, it will likely have a hard time breathing.

@japanfossil So ready to get our hands on one of these bad boys!