Show keep ing U P I 1 1 V cien e 1 ap L 11 ej vc e service service 0 fi 1111 att ire airplanes enow div fly freely in cw test tunnel scientists test catap catapult tilt for or launching transports by WATSON DAVIS directors science service langley field va minia take off and airplanes uro re kneuver nan euver for the I 1 sake of set ar nce ace in tho the worlds first 11 freo re a ight wind tunnel just dem nitrated for the first time y the national advisory ommittee for aeronautics t Us its laboratories hero here instead ol of the small counterpart a full sized airplane being held in tin an experimental ast of air the artificial breeze breeza Is creased until the model takes off itself and flies freely then aller is and rudder are controlled by agnatic fields acting on small dec clec a magnets in tho the models wings 13 0 scientist in charge maneuvers e test model plane just as a pilot indies a real one A wo expect that this now new method 11 studying airplane stability v and r atrol will give us much informs In forma 1 ii a directly that we have hitherto bained theoretically or by em cm ical esti estimation matlon said dr george I 1 lewis N A C A director of 01 earch i I 1 bumps or gusts of wind aro are measured and studied by two new ah ickes fees devised by N A C A ex arts s A instrument fits pocket ne ot of these Is a bump recorder tall all enough to ili fit into the pocket va out ut of these instruments are I 1 ted ced in airplanes and seaplanes sea planes of ett rent erent types during actual flight e of them has been carried by il china clipper on round und trips it een san francisco and manila a M tho the curve traced by tho the in n ament ent engineers are able to ross ress V strict every roughness rougene of the rage age and tell what stresses tho the V it withstood e lusts are mado made to order in a new nel el and model airplanes are cat P ted died into them As fast as an ap ow Is 13 shot from a bow the tiny atel ne e Is accelerated to BO 50 miles per r in a few feet of travel lilt hit by gust Us its action Is recorded by a ion on picture camera he a famous ff A C A cowling ch streamlined air cooled ines es so effectively several years has bas been improved and adopted adapted ie e 1500 horsepower engines dep ped ed in the past few years there a adjustable nose slot in the cowling design so that the can give the engine more cool air while it Is working hardest takeoff take off affy distance st by reducing the siz size I 1 of rivets a airplane wing by one no thirty tj nil nd of an inch it Is possible F educe the power necessary by horsepower this la Is one result w it 0 experiments on the friction 1 on the wings of largo large modern modem I 1 1 it sees mes in operating high perance modern modera aircraft the im 4 nce ice of smooth surface in a yu re 11 a so 9 great at that tile the N X A C A arts rt suggest it may inny be found in I 1 cal to have service lee crows crews d off ace accumulated dirt and dust ig 9 surfaces at every stop U ge at r transports leaving our w TO in the future may be cata 7 s Z d in order to assist their take na a reduce the long run now sary y it if a suggestion of 0 f the C A 4 Is adopted A catapult waitha acceleration of gravity ia reduce the takeoff take off distance I 1 1800 feet to 1150 fact |