US1752874A - Flying boat - Google Patents

Description

E. zlND FLYING B April 1, 1930.

Filed June 1938 A Patented Apr. 1,1930

' uui'rso STATES PATENT OFFICE mar or nnssnu, enmnx, nssmnon 'ro nuoo JUNKEBS, or nnseau,

. a em ammo Boar Application med June't), 192e, serial No. 284,059, and in Germany February I' l, 1928.

.My invention refers to flying machines and more es ecially to that type which is called flying oat because thefu selage resembles the hull of a boat and is adapted to rest on andbe partly immersed, in the water. My invention has particularly reference to flying boats having two parallel fuselages in the form of boats, hulls, which are spaced symmetrically and in parallel to the middle axis of the craft.

Flying boats of the twin-hull type offer the advantage, as compared with sin le-hull ma-- chines, of presenting greater sta ility when floatingon the water. On the other hand this type of flying boats involves a disadvantage, which becomes apparent more particularly in twin-hull machines of the monoplane type with a self-supporting wing, in which the win forms the only connection between the two ulls. This disadvantage consists therein that the middle portion of the wing intermediate the two hulls is subjected to severe bending and torsional" stresses by shocks, for inv stance the impact of waves acting on a hull from the side or when the buoyancy is not evenly distributed on the two hulls, for instance in the case where the craft moves forward in oblique direction to high waves.

' versal The resent invention is concerned with means or increasing the resistivity of this middle portion of the wing structure intermediate the two hulls. To this end I provide braces or struts secured to the bottom parts of the adjoining side walls of the two hulls, these braces or struts being either connected with each other in fixed points underneath the girder connecting the two hulls, or in points forming part of the middle wing-portion, so that this bracing structure assists the girder in taking up the stresses acting thereon.

I may arrange such bracing connections in a'singletransversal plane, but I prefer providing such structures in at least two transpllanes at a considerable distance from each 0t er, as in this manner I obtain a more eflicient resistivity against torsional stresses. Preferably the ends of the struts fixed to the boats hulls are secured to a middle hull arranged in the middle 'axis of the craft and projecting downwards from the wing without acting as a floating body. I may however also provide auxiliarystructures below the bottom of the mlddle wing portion, the connecting securing the hulls.

In the drawings aflixed to this specificatio and formlng part thereof two flyng boats ein bodying my invention are illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a vertical longitudinal section on the line II in Fig. 2, while Fig. 2 is a front view and 3 is a plan view of one-modification.

t F 1g. 4; is a front view of another modifica- Referring to the drawings and-more particularly to Figs. 13, 1 and 2 are the two hulls serving as floating bodies and 3 is a mid, dle hull arranged between them without how/- ever extending down to the water surfac. These three hulls are interconnected by a girder constituted by the middle portion jdf the self-supporting wing 4. In order to tblri-e this wing portion of the bending and t'orsional stresses arising more particularly n a heavy sea, struts 11, 12 extend from the ttorn parts of the hulls 1, 2 to the bottom, art of the middle hull 3. As shown in Figs. 1 and 3, two such bracing structures are provided between the two hulls 1 and 2.

In the modification illustarted in Fig.4, which is not provided with a middle hull projecting below the bottom of the wing, auxiliary bracing structures are provided below the wing bottom, consisting of struts 13 and horizontal braces 14:. The struts 1,1 and 12 fixed to the boats hulls 1, 2 are secured to the connecting points 15, 16 of the auxiliary bracing structure.

My invention may be applied with equal advantage also to compound-machines of the amphibium type which form a combination of land and seaplane and in which besides the floating bodies a separate landing carriage is provided. This modification is indicated in dotted lines in Figs. 1. and 2, which show a wheel 21, 22 arranged on each hull directly in front of the step 23, an auxiliary pike 24 being provided at the end of each hull. These points of such auxiliary structure serving for the inner ends of the struts fixed to wheels'and auxiliary pikes may bearranged to be folded up in a well known manner in order that the propulsion of the boats in the water be hindered as little possible.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim 1. A flying boat of the monoplane twinhull type, comprisin a wing forming a continuous beam, two oating hulls adapted to carry the entire weight of the craft, said hulls being rigidly fixed to and extending below the bottom of said wing in spaced relation and substantially parallel to the longitudinal middle axis of the craft, and means spaced from said wing for bracing the adjoining side walls of said hulls against each other and for reintorcing the ortion of said wing intermedi-v ate said hu s.

2. A flying boat of the monoplane twinhull type, comprising a wing forming a continuous beam, two floating hulls adapted to carry the entire weight of the craft, said hulls bein rigidly fixed to and extending below the ottom of said wing in spaced relation and substantially parallel to the longitudinal middle axis of the craft, and means spaced from said win for bracing the adjoining side walls of said hulls against each other and against the middle portion of said wing and for reinforcing the portion of said wing intermediate said hulls.

3. A flying boat of the monoplane twinhull type, comprising a win forming a continuous beam,'two floating ulls adapted to carry the entire weight of the craft said hulls being rigidly fixed to and extending below the bottom of said win in spaced relation and substantially parallel to the longitudinal middle axis of the craft, and struts spaced from said wing for bracing the ad'oining side walls of said hulls against each 0t er and for reinforcin the portion of said wing intermediate said ulls.

4. Aflying boat of the monoplane twinhull type, comprisin a wing forming acontinuous beam, two oating hulls ada ted to carry the entire weight of the craft, sald hulls being rigidly fixed to and extending below the bottom of said win in spaced re ationand substantially para el to the longitudinal middle axis of the craft, and struts spaced from said wing fo bracing the adjoining side walls of said hurls against each other and against the middle portion of said wing and for reinforcing the portion of said wing intermediate said hulls.

5. A flying boat of the monoplane twinhull type, comprising a wing forming a continuous beam, two floating hulls adapted to carry .the entire weight of the craft, said hulls being rigidly fixed to and extending below the bottom of said wing in spaced relation and substantially parallel to the longitudinal middle axis of the craft, and means spaced fronrsaid wing and extending in two longitudinally spaced planes for bracing the adoining side Walls of said hulls against each other and for reinforcing the portion of said wing intermediate said hulls.

6. A flying boat of the monoplane twinhull type, comprising a wing forming a continuous beam, two floating hulls adapted to carry the entire weight of the craft, said hulls being rigidly fixed to and extending below the bottom of said wing in spaced relation and substantially parallel to the longitudinal midd Is axis of the craft, and struts spaced from said wing and extending in two longitudinally spaced planes for bracing the adjoining side walls of said hulls against each other and against the middle portion of said wing and for reinforcing the portion of said wing intermediate said hulls.

7. A flying boat of the monoplane twinhull type, comprising a wing forming a continuous beam, two floating hulls adapted to carry the entire weight of the craft, said hulls being rigidly fixed to and extending below the bottom of said wing in spaced relation and substantially parallel to the longitudinal middle axis of the craft, and means for bracing the adjoining side Walls of said floating hulls against each other and agaiust the middle portion of said wing, said means including a hull extending below the bottom of said wing intermediate said floating hulls.

In testimony whereof I affix my signature.

ERNST ZINDEL.

Images