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Show PLACING 213 AIRPLANES ON FLEET URGED (Continued from Page One) na-y officers being confident that the I nlied States has kept fully abr aai of the world thus far in aviation de- elopmi iUs. Half a dozen or more engines Of Improved power and prejudiced pre-judiced weight have been nroduced. it was explained, tho endurance of new engines has boon tested up to 300 hours continuous operation as compared com-pared to a 50-hour test htandard prevailing, pre-vailing, and experimental work with a Delsel tpe fuel oil engine for aircraft air-craft purposes has given great promise, prom-ise, the senators woro told. oo |