Show SILENCERS USED ON WAR AIRPLANE By Dy Special News New Service I Silencers are needed on aeroplane I engines s to eliminate the noise of ot approach approach ap ap- I ap-I which IB la the only thing that I warns the enemy of ot the approaching warplanes at night ways ays Flying The I silencers Ie must do their work thoroughly thoroughly thor thor- i eliminating the exhaust sounds entirely because the antiaircraft units have ha powerful microphones that magnify magnify mag mag- i the slightest lightest sound Lacking silencers silencers for for for not other reason reason reason rea rea- i son than the added weight and slight alight loss lose of power raiding power raiding aeroplanes aeroplane are forced to fly at high altitudes in an attempt to escape detection The weight of ot the fuel tuel needed and the hor horsepower power and time spent in evading c detection this way represent really runy a greater loss of ot efficiency than the loss lose caused by bythe bythe bythe the silencers I |