Show I i J Streamline Shapes Aid Speed i 0 Science has developed the airplane to such a state of ot perfection that In sailing sallInS' sallInS sail sall- InS InS' through space it meets with as little air resistance as possible This Is because a the h wings and planes are ta ee nl If shaped along n what h Is termed e streamline m forms When all air or water flows past an obstruction obstruction ob ob- ob- ob It spreads out and curves Ina in ina ina a smooth path An object that Is curved to fit in with the stream of the passing air all or water Is called streamline in shape and it offers the least possible resistance to the t passing A streamline body Is somewhat egg shaped with Its length three times its greatest thickness which is a the head or the end which cuts the air Exact streamline form can be determined only by careful calculations taking Into n e-n- I the velocity of the moving body and other details 0 When a ball Is thrown swiftly through the air a partial vacuum Is formed directly behind It which tends slightly to suck It back A streamline object Is so designed as to fill this space and allow the air or water to slip by smoothly One great difficulty In designing streamline streamline- forms arises from the fact tact that this vacuum increases in size with the Increase o of ot the objects object's velocity Therefore the length of the streamline form should be greater for higher V ve ye- ye Swift E wit moving fish are long and slender slender slen slen- der wh e slower fish are shorter and more chubby Hence a streamline form is actually fi fo most 1 t suitable lg for one particular par par- ait c velocity As airplanes s nova move v at various speeds the parts are designed to function best at the most frequent H velocity |