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A neutrally buoyant flying toy has a tail fin assembly and a movable weight element that are configured such that the toy moves forward and can be steered left and right by controlled motion of the tail fin, and such that the toy ascends or descends by controlled motion of the weight element. Most p

A neutrally buoyant flying toy has a tail fin assembly and a movable weight element that are configured such that the toy moves forward and can be steered left and right by controlled motion of the tail fin, and such that the toy ascends or descends by controlled motion of the weight element. Most preferably, the toy is configured as a fish and is remote controlled.

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1. A flying toy, comprising: a body portion that is configured to be inflatable by a lighter-than-air gas to thereby form an inflated body that is compressible by an elastic element, wherein the body portion has a volume sufficient to provide neutral buoyancy to the toy when the body portion is infl

1. A flying toy, comprising: a body portion that is configured to be inflatable by a lighter-than-air gas to thereby form an inflated body that is compressible by an elastic element, wherein the body portion has a volume sufficient to provide neutral buoyancy to the toy when the body portion is inflated with the lighter-than-air gas, and wherein the body portion is formed from a polymeric film;a tail assembly that is coupled to the body portion by the elastic element, wherein the tail assembly, the body portion, and the elastic element are configured such that the elastic element assists, via exertion of a compressive force to the body portion, in maintaining sufficient rigidity of the body portion for propulsion by a moving surface when the toy is inflated with the lighter-than-air gas;wherein the moving surface that is coupled via a first actuator and the tail assembly to the body portion, wherein the first actuator is coupled to the tail assembly, and wherein the first actuator is configured such that the moving surface is reciprocally movable by the first actuator at variable and different angles relative to a forward directional axis of the toy to thereby provide propulsion to the toy;a second actuator coupled to the body portion via a guide element that extends in a parallel or perpendicular direction relative to the forward directional axis, and wherein the second actuator is configured to allow movement of a weight element by the second actuator in parallel or perpendicular direction relative to the forward directional axis; andwherein the weight element and guide element are coupled to the body portion such that the movement of the weight element changes pitch of the toy while the toy is flying to thereby allow for controlled ascent or descent of the flying toy. 2. The toy of claim 1 wherein the moving surface is configured as a fish fin. 3. The toy of claim 1 wherein the guide element is configured as a rail or I-beam and has a curvature. 4. The toy of claim 3 wherein the curvature is substantially the same as that of the body portion where the rail or I-beam is coupled to the body portion. 5. The toy of claim 3 wherein the weight element further comprises removable ballast elements. 6. The toy of claim 1 wherein the flying toy has a shape of a fish, and wherein the moving surface is configured as tail of the fish. 7. The toy of claim 1 wherein the body portion comprises or is coupled to at least one stabilizing air foil. 8. The toy of claim 1 wherein first and second actuators are controllable by an RF remote control system. 9. A tail fin assembly for a flying toy having a body portion that is configured to be inflatable by a lighter-than-air gas to thereby form an inflated body that is compressible by an elastic element, and wherein the body portion has an anchor element and is formed from a polymeric film, the tail fin assembly comprising: a base plate comprising an actuator that is coupled to a moving surface such that the moving surface is reciprocally movable by the actuator at variable and different angles relative to a forward directional axis of the toy;an elastic element coupled to the base plate and configured to compressibly couple the tail fin assembly via the anchor element on the body portion to the inflated and compressible body portion of the toy;wherein the tail fin assembly, the body portion, and the elastic element are configured such that the elastic element assists, via exertion of a compressive force to the body portion, in maintaining sufficient rigidity of the body portion for propulsion by the moving surface when the toy is inflated with the lighter-than-air gas; andwherein the base plate and toy are configured such as to allow application of a compressive force to the body via the elastic element. 10. The flying toy of claim 9 wherein the actuator is a remote control servo. 11. The flying toy of claim 9 wherein the moving surface is configured as a fin and formed from a tail portion that is filled with a lighter-than-air gas. 12. The flying toy of claim 9 wherein the toy is configured as a fish, and wherein the moving surface is configured as a tail fin. 13. A neutrally buoyant flying toy, comprising a body portion that is configured to be inflatable by a lighter-than-air gas in an amount effective to render the toy neutrally buoyant to thereby form an inflated body that is compressible by an elastic element;an actuator that is coupled to the body portion via a guide element that extends in a parallel or perpendicular direction relative to the forward directional axis;wherein the actuator is configured to allow movement of a weight element along the guide element by the actuator in parallel or perpendicular direction relative to a forward directional axis of the toy such that movement of the weight element changes pitch of the toy relative to the forward directional axis while the toy is flying to thereby control ascent or descent of the flying toy;wherein the elastic element is configured such that the elastic element assists, via exertion of a compressive force to the body portion, in maintaining sufficient rigidity of the body portion for propulsion by a moving surface that is coupled to the body portion when the toy is inflated with the lighter-than-air gas; andwherein the weight element further comprises removable ballast elements. 14. The flying toy of claim 13 wherein the actuator is configured to allow movement of the weight element parallel to the forward directional axis of the toy when the moving surface is configured to move side-to-side for forward propulsion of the toy. 15. The flying toy of claim 13 wherein the guide element is configured as a rail or I-beam and has a curvature that is substantially the same as that of the body portion where the rail or I-beam is coupled to the body portion. 16. The flying toy of claim 13 wherein the toy is configured as a shark, and wherein the weight element is configured as a remora.