Peripheral tunnels propeller with alternative balance

A propeller comprising

• a truncated substantially conical block spinning around a rotation axis,
• said conical block having a plurality of holes as helical tunnels surrounding the rotation axis,
• each of the holes having inlet and outlet at each end face of the conical block, respectively, wherein each end face of the conical block is disposed at each end of the conical block,
• said conical block having permanently integrated at least one Dynamic Balance Means,
• said Balance Means integral to the conical block and disposed about the rotational axis,
• said Balance Means having a function to balance or Imbalance at specific periods,
• whereby the propeller generates a specific sound wave.

A propeller comprising

• a truncated substantially conical block spinning around a rotation axis,
• said conical block having a plurality of holes as helical tunnels surrounding the rotation axis,
• each of the holes having inlet and outlet at each end face of the conical block, respectively, wherein each end face of the conical block is disposed at each end of the conical block,
• said holes having cross-sections with substantially circular shape at one end which progressively reshape into an ellipsoidal shaped cross-section at an opposite tunnel end,
• and said cross-sections lie in constant perpendicular plane to the rotation axis from end to end,
• said conical block having a plurality of flow-guiding structures attached to the ends,
• said flow-guiding structures described as aerodynamically chamfered wedge disposed at each end face and among the ends of the holes,
• said chamfered wedges having a base at the respective end face,
• said wedges base having a cross-section substantially shaped as an annular sector having concave ends, each end congruent with a semi cross-section of an adjacent one of the tunnels,
• said wedges cross-section varying progressively its shape at one of the concave ends until said end is shaped convex and is congruent with an opposite one of the concave ends as a base plane rises above the respective end face,
• Whereby rotation of the conical block induces minimal turbulence on the perpendicular momentum of the fluid inside each respective hole thus avoiding collateral noise and delaying the cavitation phenomena.