Stepped cambered planing hull
Various embodiments are disclosed for a stepped cambered planing hull for a boat including a swept back cambered planing surface having a non-linear distribution of camber. The non-linear distribution of camber along the swept back cambered planing surface may enable stepped cambered planing hulls having high deadrise (i.e., greater than 15 degrees). The stepped cambered planing hull may include a shaped hydrofoil that generates further hydrodynamic lift by piercing the free surface wake produced by the swept back cambered planing surface. The stepped cambered planing hull may have external bottom surfaces adapted at the after-body and transom to accommodate a distinctive profile of the free surface wake produced by the swept back cambered planing surface. The stepped cambered planing hull may include an adjustable interceptor blade to regulate hydrodynamic lift at low speeds or to ensure an optimal dynamic trim angle in a wide range of speeds.
1. A planing hull for a boat, comprising:
a fore-body portion;
a V-shaped swept back cambered portion, wherein the swept back cambered portion extends from the fore-body portion and is longitudinally bounded between a V-shaped leading edge and a V-shaped trailing edge;
a step; and
an after-body portion,
wherein the step vertically offsets the after-body portion from the swept back cambered portion towards an interior of the planing hull, and
wherein an external bottom surface of the V-shaped swept back cambered portion has a non-linear distribution of camber, such that the camber of the V-shaped swept back cambered portion is greater between a keel and chine on a respective side of the hull than along the keel and the chine.
2. The planing hull of claim 1 , wherein the camber of the external bottom surface varies transversely across the swept back cambered portion in amplitude, phase, or a combination of amplitude and phase.
3. The planing hull of claim 1 , wherein the camber of the external bottom surface has a flat portion, a rising curved portion and falling curved portion.
4. The planing hull of claim 1 , wherein the camber of the eternal bottom surface is a Johnson three term camber.
5. The planing hull of claim 1 , wherein the fore-body portion has a deadrise angle equal to or greater than fifteen degrees.
6. The planing hull of claim 1 , further comprising a transom, wherein an external bottom surface of the transom has a W-shaped cross sectional profile.
7. The planing hull of claim 6 , wherein an external bottom surface of the after-body portion has a cross section profile, wherein the cross section profile transitions from the W-shaped cross sectional profile to a V-shaped cross section profile along a longitudinal length of the after-body portion.
8. The planing hull of claim 1 , further comprising a U-shaped hydrofoil attached or position adjacent to a transom of the planing hull.
9. The planing hull of claim 1 , further comprising a W-shaped hydrofoil attached or positioned adjacent to a transom of the planing hull.
10. The planing hull of claim 1 , further comprising:
an interceptor blade positioned at or adjacent to the step, wherein the interceptor blade is configured to be lowered to pierce a free water surface to increase lift.
11. The planing hull of claim 10 wherein the interceptor blade is configured to be lowered to a depth that exceeds a height of the step to increase a size of the swept back cambered portion.
12. The planing hull of claim 1 , wherein the interceptor blade is configured to be raised or retracted at planing speeds.
13. The planing hull of claim 1 , wherein the interceptor blade conforms to and extends for the entire length of the V-shaped trailing edge of the swept back cambered portion.
14. The planing hull of claim 1 , wherein the interceptor blade conforms to and extends for a truncated length of the V-shaped trailing edge of the swept back cambered portion.
15. The planing hull of claim 1 , wherein a height of the V-shaped trailing edge of the swept back cambered portion varies nonlinearly between the keel and the chine.
16. A planing hull for a boat, comprising:
a fore-body portion;
a swept back cambered portion, wherein the swept back cambered portion extends from the fore-body portion;
a step; and
an after-body portion, and
a transom;
wherein the step vertically offsets the after-body portion from the swept back cambered portion towards an interior of the planing hull, and
wherein an external bottom surface of the swept back cambered portion has a non-linear distribution of camber; and
wherein an external bottom surface of the transom has a W-shaped cross sectional profile.
17. The planing hull of claim 16 , wherein an external bottom surface of the after-body portion has a cross section profile, wherein the cross section profile transitions from the W-shaped cross sectional profile to a V-shaped cross section profile along a longitudinal length of the after-body portion.