plane peen

2. 4. a surface or superficies such that every straight line joining any two points in it lies wholly rn it; a surface whose intersection with any other like surface 1s a straight line; eften, a herzzental plane; a level. 2. [also, sometimes, spelt ‘plane] a material surface approximately of this nature; also, a thin flat structure presenting such surface or surfaces to the air; a plane aeroferl; an aeroplane. 5 articulated plane, a sustaining-plane in a flying-machine articulated or jernted 1n such a manner as to make pe ible the reduction or increase of the supportrng-area according to the speed of the machine. falling plane, an aeroplane or aerofexl which is falling freely thru the air or other fluid, as 1m aerodynamrc experimentation. following plane, a plane or aerofe1l which follows, or is attacht at the rear of the other planes or parts of a kite or flying-machine; one of the hinder supporting-planes among several which are placed tandem. compare leading plane. horizontal plane, an aeroplane or aeroferl which 1s in a herzzental position rn the air or other fluid, as rn aerodynamic experrments: distinguisht from inclined aeroplane. leading plane, a plane or aerofe1! which leads. main plane, see main-plane. normal plane, a plane or aeroplane whose surface is normal, or at right angles to, the line of the direction of its translatory motion thru the air. oblique plane, a plane or aeroplane whose surface 1s oblique or inclined to the line of the drrection of its translatory motion thru the air; a slanting plane or aeroplane. superposed plane, an aeroplane or aeroferl which is placed above another, as the upper of the two planes of a biplane flying-machine or kite; one of a series of such planes. trochoidal plane, a plane the center of whtch moves in a circular path at a uniform speed while the plane is kept normal to the surface of a trocherdal wave the period of which is equal to the time eccupied by the center of the plane in making one revolution. 3. [also spelt *plane] a flying-machine whose sustaining: stguctures are panes. or aeroplanes; an aeroplane flyer; an aeroplane. plane peen adj. such that every straight line joining any two points in rt lies wholly in it; flat; level. plane preen inti. drive an aeroplane flying-machine; move in a flyer: as, he *planed gently downward to earth.