Show ON PRINCIPLE OF BOOMERANG 4 Airplane con Constructed Along Sam sa Lines as the Famous Weapon of ei Australian Bushmen Oil Although an a anomaly alY to go to th tt primitive savages of Australia Australla f points on an airplane that was Ju juI what was done in the I of flying In the air by humans Th fundamental principle of the plane Ii both old and simple having ha been dl die covered co by the bushmen of the anti odes and embodied by them in tb boomerang which by meeting in I la- la flight the air at a slight angle anglea got gota rot rota j a lift The trajectory of the boomerang may be in part horizontal or may eve even rise as a result of this lift Any surface sur sun face that is more or less flat fiat that tray tra I els ems at a slight angle through the aJr Ji tends to lift If the section has iv t slight camber or convex curve th flit lift is Increased Better results ari aril obtained if a body of ot thickness is used Instead d of a th sheet These points the Australian dl db l covered Investigation will show little differ dies ence between the wing section of thi th modern airplane and a cross cros section of ot a made by bI the l lor or whittled od by br a New York boy att after he had visited the circus and had the stunts of the boomerang throwers l t The resemblance of the boomerangs cross section is closer to a propeller section of an airplane as a boomerang Is a sort of cross between lin an aneZ ni wing and a propeller 2 4 41 1 |