Amphibious undercarriage for aircraft
阅读：459发布：2024-01-02
专利汇可以提供Amphibious undercarriage for aircraft专利检索，专利查询，专利分析的服务。并且The invention is an amphibious undercarriage for aircraft and is also an undercarriage for seaplanes providing improvements which reduce the maximum landing and takeoff structural loads in the aircraft, reduce the weight and drag of the seaplane, and provide capability for seaplane undercarriages to alight on snow.，下面是Amphibious undercarriage for aircraft专利的具体信息内容。
1. An undercarriage for aircraft for attachment to the two main tires, wheels, and struts of land aircraft providing for water take off and landing, and providing for said wheels and struts to absorb shock of said take off and landing, comprising an extension plate connected to each strut, the main wheel connected to the end of the extension plate, and a float connected to the bottom of the tire of the main wheel, the connection to the bottom of the tire being made by a fork journaled at the forked end to an axle of the main wheel with the other end of the fork pivoted to the float with the pivot axis parallel to the main wheel axle, the float connected by a cable from the forebody of the Float to the aircraft, by another cable from the afterbody of the float to the aircraft, both cables located in the same plane with the strut and each cable containing a means for applying tensioning and motion damping forces to the cable, whereby the inside bottom of the float is pulled against the tire so that water landing loads are transmitted from the float to the tire, the resulting compression of the main wheel tire and strut being accommodated by said means for applying tensioning and damping forces in the cables, and the resulting bending of the strut being accommodated by corresponding motion of the coplanar cables.
2. An undercarriage for aircraft as described in claim 1 providing for ski takeoff and landing, wherein said means for applying tensioning and damping forces in said cables has mechanical means for limiting the extension and contraction of said cables so as to restrain said float while the aircraft is in flight to a nose high attitude, yet permitting said float to rotate in pitch against said tensioning and damping forces as said float bottoms contacts and conforms with the snow terrain during landings and take off in the usual manner of ski undercarriages.
3. An undercarriage for aircraft as described in claim 2 providing for wheel take off and landing comprising a hole made in the bottom of said float under said main wheel tire, the whole being covered with an actuating plate, the actuating plate having means for constraint to a fore and aft sliding motion on the bottom of said float, the actuating plate having controlled means for causing the fore and aft sliding motion, the actuating plate having means for engaging a leaf spring to the bottom of the forebody of said float, a castering nose wheel being mounted at the forward end of the leaf spring, a means for forcing the pivoted leaf spring against the actuating plate, said float having a spring loaded door in the bottom of the forebody to provide egress for the nose wheel; thereby causing linear vertical retraction of said float to expose the said main landing wheel for use in alighting on land and for simultaneously causing the castering nose wheel to extend from said float for use in alighting on land.
4. An undercarriage for aircraft as described in claim 1 in which said float has a cross sectional shape providing a large reduction in the maximum vertical deceleration experienced in water landing, comprising a nearly flat bottom at the keel curving sharply upward to an outward and downward concave curve at the chines, the average deadrise angle being about 30*, thereby first presenting the nearly flat bottom at the keel to dynamic impact with the water surface so generating an initial vertical decelerating force which remains approximately constant as the cross section immerses at reducing velocity by exposing a greater area to the reducing vertical dynamic pressure.
5. An undercarriage for aircraft as described in claim 1, providing aerodynamic yaw stability to said float, comprising a vertical fin connected to the afterbody of said float, whereby the natural aerodynamic yaw instability of said float is neutralized by the area of the vertical fin acting against the airflow thereby reducing the inflight yawing torques which must be transmitted between said float and the aircraft by the said fork.
6. An undercarriage for aircraft as described in claim 5 providing reduced aerodynamic drag by said float comprising afterbody streamlining to zero cross section area at the stern cross section, whereby the water rudder is hinged to said fin.
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