US2358931A - Airplane flight demonstration device - Google Patents

Description

Septo 26, 1944. M. H. KAI-:Low

IRPLANE FLIGHT DEMONSTRATION DEVICE Filed July 4, 1942 2 Sheets-Sheet 1 MFI;

' Kw MM H. KAHLow i? M. H. KAHLOW 2,358,93

AIRPLANE FLIGHT DEMONSTRATION DEVICE Filed July 4, 1942 2 Sheets-Sheet 2 A Patented Sept. 26, 1944 2,358,931 AIRPLANE FLIGHT DEMON STRATION DEVICE Max Il. Kahiow, Norwood, Pa., assignmto Gordon Laughead,

Grand Haven, Mich.

Application July 4, 1942, Serial No. 449,770

(Cl. :i-12) 1 Claim.

My invention relates to airplane ight demonstration devices and has for its primary object to provide means to illustrate the theory of iiight to the student pilot in a simple but effective manner.

Heretofore a part of the theory of flight has been taught by black board demonstration or the use of cumbersome expensive apparatus whereas with my device the same can be taught and effec- A tively demonstrated through the medium of a small, light weight portable cabinet which encloses all the necessary apparatus.

With the above and other objects in view, the invention may be said to comprise the apparatus as illustrated in the accompanying drawings and hereinafter described and particularly set forth in the appended claim, together with such variations and modifications thereof as will be appar ent to one skilled in the art to which the invention appertalns.

Reference should be had to the accompanying drawings, forming a part of this specification, in which:

Figure 1 is a side elevation of my flight demonstrator apparatus; l

Fig. 2 is a top plan view with covering top re moved; and

Fig. 3 is a fragmentary sectional view on the line 3-3 of Figure 2 illustrating the operation of the air foil.

The apparatus consists of a cabinet l open at both ends 2`and 3 having a window enclosed port 4 through which a small air foil 5 may be viewed. Said air foil 5 has an extending arm 6 fixed to the inner end thereof and is hinged through the medium of a hinge pin l to a bracket 8 aflixed to a side wall of the cabinet. An adjustable weight 9 is positioned on the inner end of the arm 6 so as to permit relative counter-balancing of the air foil E.

An electric fan I0 controlled by a rheostat l l 'is mounted within the cabinet adjacent the air foil which fan supplies a constant blast of air to actuate said air foil. Suspended between the fan and air foil is an air speed indicator of the resistant arm type, comprising a paddle l2 affixed to an arm I3 which passes through and is sup.-

ported by a sleeve I4 which is in turn aiiixed to the side of the cabinet. The said arm I3 extends through the cabinet and to the outer end thereof is afxed a pointer l5 which registers the fan air speed on a dial I6 mounted on the exterior of the cabinet. A smoke generator I1 is positioned in the rear of the motor and may consist of a simple metal pan containing sawdust which when lighted and allowed to smoulder produces smoke or the said pan may contain a chemical that will produce smoke.

The apparatus functions as follows: The motor is plugged in any convenient outlet and the rheostat advanced to a desired speed which will be indicated on the air speed indicator dial. Air will be drawn through the port 3 adjacent the motor and will pick up smoke from the smoke pot l1 pass over the air foil 5 and then exhaust from the port 2 on the opposite end of the cabinet. The balanced air foil will be elevated through the action of the stream of air on the air foil surfaces and the amount of elevation of said air is controlled by variation of speed of the ian which is in turn controlled by operation of the rheostat.

The smoke laden air passing over the air foil will be visible through the Window and air burbles indicating the yaction of the air on the foil will be visible to the observer. Through the action of the smoke laden air passing over the air foil surface the observer can actually perceive the action of air pressure on the air foil which permits ight of heavier than air craft.

It will be apparent that the present invention provides a very simple, effective and inexpensive apparatus for primary aeronautical training by means of which of the rudimentaries of ight training.

Furthermore, it is to be understoodthat the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modications of said apparatus and procedure can be made without departing from my invention as deiined in the appended claim.

What I claim is:

Flight demonstration apparatus comprising, a cabinet having closed top, bottom and side walls and end walls each having an opening formed therein; means for inducing the passage of a stream of air .through said cabinet; an airfoil in said cabinet having a leading edge, a trailing edge and at least one substantially straight side edge; means in said cabinet supporting said airfoil in the path of said air stream, said means including a pivotally mounted arm having a rigid connection at one end with saidv side edge of said airfoil and having a counterweight on the other end thereof tending to counterbalance the weight of said alrfoil, one of said side walls of said cabinet including a transparent portion through which said airfoil is visible from the exterior of said cabinet, said airfoil being suiiiciently large to visually demonstrate airfoil action in wing iiight; and manually operable means on the exterior of said cabinet for controlling the speed of air flow over said alrfoil.

MAX H. KAI-ILOW.

a student may be taught some

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