High performance amphibious aircraft

• US 5,415,365 A
• Filed: 11/08/1993
• Issued: 05/16/1995
• Est. Priority Date: 11/08/1993
• Status: Expired due to Fees

• Current Assignee: Paul D. Ratliff
• Original Assignee: Paul D. Ratliff
• Inventors: Ratliff, Paul D.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): MARQUIS, LISSI MOJICA
• Application Number:
  US08/148,558
• Time in Patent Office: 554 Days
• Field of Search: 244/100 A, 244/101, 244/105, 244/106, 114/271, 114/272
• US Class Current: 244/101
• CPC Class Codes: B64C 35/00 Flying-boats; Seaplanes

Abstract

An amphibious aircraft, capable of high speed maneuverability on the surface of the water, utilizes a aerodynamic platform to generate lift and to define a tunnel with a pair of central sponsons extending inwardly of the wings of the aircraft longitudinally of the platform which supports the cockpit and propulsion system.

Claims

1. An amphibious aircraft having a weight to volume ratio creating an overall density less than water, comprising in combination:

an airfoil platform having a longitudinally tapered thickness from a forward portion thereof to a rear portion thereof such that lift is provided by said airfoil platform, a fuselage integrally formed with said airfoil platform and defining a continuous surface therewith., defining a cabin extending upwardly from and located along the longitudinal centerline of the platform, a pair of opposed sponsons affixed to the underside of said platform and extending over substantially the entire length of said platform to define a diminishing volume tunnel with said platform, said sponsons being partially defined by opposing substantially vertical stepped surfaces, a bottom hydrodynamic lift surface and an intermediate hydrodynamic lift surface each being substantially perpendicular to adjacent vertical stepped surfaces, and each sponson of said pair having a faceted outer surface, a pair of wings extending laterally from said platform and forming a substantially continuous upper surface therewith, means for providing propulsion to said aircraft and means for controlling the motion of said aircraft.

2. An aircraft as defined in claim 1 wherein said sponsons include an upturned bow portion forward of said platform and diminished in height toward the rear of said platform.

3. An aircraft as defined in claim 2 wherein the underside of said platform is substantially planar intermediate said sponsons.

4. An aircraft as defined in claim 1 wherein said outer faceted surface provides a wide area for dispersing lateral forces against the surface of the water and said vertical walls present a high surface area opposing movement through the water normal to said surface.

5. An amphibian aircraft comprising a central platform having an upper surface in the shape of an airfoil and a substantially planar lower surface, a fuselage mounted superiorly centrally on said platform, a pair of sponsons integrally formed beneath said platform including substantially vertical inner sponson surfaces and faceted outer sponson surfaces, each sponson having a bottom hydrodynamic lift surface and an intermediate hydrodynamic lift surface formed on said vertical inner sponson surface, a pair of wings forming a laterally continuous surface from said upper surface and extending outwardly from said central platform, an empennage affixed to said central platform, and a plurality of control surfaces providing lateral and vertical directional control.

6. An aircraft as defined in claim 5 wherein said central platform is a lift providing airfoil tapering from a thicker forward portion to a thin rear portion extending beyond said sponsons.

7. An aircraft as defined in claim 6 wherein said sponsons are defined by inwardly facing generally vertical wall surfaces and faceted outer surfaces.

8. An aircraft as defined in claim 7 wherein said sponsons include an upturned bow portion forward of said platform and diminished in height toward the rear of said platform.