池蝠鲼-它＂飞＂水下

Like a glider through the air, but in reverse, the Pool Manta “flies” through the water as buoyancy makes it rise. Swim to the bottom of the pool and release the manta and watch it swim with life like motion. The tail moves forward and back to change the center of gravity, which effects how quickly it swims. [ Weight forward causes it to swim quickly straight to the surface and jump with a splash. Weight back- makes it swim slowly in a long climb to the top. Balanced weight- makes it swim back and forth in small jerky motion. Place it upside down and it will do a flip and right itself before it surfaces]. Rotate the tail to make it turn. A fin on top pivots to act like a rudder. Move it a little to adjust the trim and make the manta swim straight. Pivot it a lot and the manta will swim circles around you.
This item has been printed and tested in my pool.. it is more than theory
[Technical notes* ABS will not hold up to sunlight, so it can’t be left in the pool. Item must be made water tight, by printing in high resolution or by brushing with acetone to seal it. ]