Show All Fighting Branches Coordinated By Radio Built for Tiny Planes army Fliers Over Wireless Result L of Long Study By Br WILLIAM WARNE Associated Tress Press Staff Writer SAN DIEGO Cal Jan 29 29 nation of or all arms the goal of mil military mili- mili tary leaders has been made possible after 14 years of experimentation by bythe bythe bythe the perfection of a 40 pound 40 pound radio radi which is capable of receiving anc and broadcasting the human vo voice ce anc and which has given cars ears and tongue to the speedy little arm army pursuit planes The set recently was tested b by the pursuit squadron at Marsh Field Cal Cat and was facetiously dubbed the two two power radio b by enthusiastic I aviators Captain IL H. M. M McClellan army radio ra radio dio expert under whose management the tiny radio station was developed today explained what it would mean to military aviation and described some of the difficulties overcome in its construction The pursuit plane itself presented the major problem With foot 30 wingspread wingspread wing wing- spread and a powerful motor the plane was 20 feet long and had a cockpit barely big enough for one man A space behind the cockpit less than a cubic foot was the only unused unused un un- used part of ot the trim little plane in which to put a radio A set capable of receiving or broadcasting a ames message message mes mes- sage on a 12 foot 12 foot aerial strung from wingtip to tail taU and amplifying it until It Jt was audible above the tremendous uproar in the cockpit had to be built to fit the space NOISE INTENSE engineers measured the noise in the cockpit at decibels or several se hundred times as intense as the uproar below an elevated track In a New York street The set was built at the approximate approximate approximate mate cost of and years of effort effort ef cf ef- ef fort ort but its technical description remains remains re reo mains a military and engineering se- se crot crat The finely tuned receiver and the amplifier C Captain McClellan s said id were among the greatest radio engineering engineering engi accomplishments In the tests Lieutenant Leo H H. Hunter Hun Hun- ter commander of oC the maneuvered maneuvered maneuvered maneu maneu- vered his ships separated them to a distance of 70 miles concentrated and md landed them b by radio orders There were no failures If U the set could not be used for anything but training Hunter said it would be a valuable asset I was able to coach my squadron while in flight ight Previous a commander tried to remember what mistakes were made and explain them upon landing long after most of them had been forgotten either cither by himself or the pilot ENVISAGES BATTLE I can envisage Captain McClellan said a a great fleet of airplanes going to battle the attack planes flying low to clear away resistance from antiaircraft antiaircraft anti anti- aircraft guns the bombers in midair and the pursuit planes at a great altitude altitude alti alti- tude acting as scouts and protecting the whole fleet from rom surprise The commander would be flying with the bombers and like an admiral in the navy would keep cep in touch with his base on the ground the attacking and pursuit units of his force and direct direct di dl the ever changing battle b by r radio What a different picture it is from that of ot an air all engagement in which the commander must give his orders without a chance for changing them once execution has begun A surprise attack of ot a few enemy planes might disrupt the whole of such an in inflexible plan The new set operates on a short wave length and requires In operation only twentieth one-twentieth the amount of power pow er oc used by miladys milady's curling iron It Itcan Itcan Itcan can transmit and receive either the voice or code The code signals comparable to bugle calls caUs were for foT use after the thel pursuit planes entered combat when the pilot was too bus busy to talk or listen They would warn of oC unexpected danger signalize a new hew opportunity opportunity I or sound a recall registering without occupying any of the pilots pilot's attention The two radio was developed dc de- de by civilian engineers under the army's supervision and quite pos pOSe sibly in the near neRr future will provide reliable communication for all aircraft aircraft air air- craft civilian or military militar at a minimum minimum minimum mini mini- mum sacrifice of oC weight and space and a minimum reduction In Jn efficiency effi effi- |