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Show PIEBCE-ill i -EilSEI Famous Dual Valve Near Efficiency Required in Airplane Motors. ; The mew Tieree-Arrow i..i'.-rs.-' j cine, which has set new stsr:it- power, flexibility asi jss:lire is almost as effieient is te f plane cr. rte r.-.sele. This s;a:en.er.t. ni.i.ie b? rsp fiusscn. chief er.stcert of tie Arrow Motor csr eorr.ysr.y. star: line when it is const.'.ere- .- j aviation motor is ttt k'-i"' enciae mechanism kiior.. lt . tests show the dv.sl-vshv! "---'- sicnoa bv the rteroe-Arr for somewhat less c-cs.-ttr.; j the nirnlar.e e:lCl-.1, :,,.;1li,' st The ctisoliae ceiisiiir i.a -ef the best makes ot si.;-:; p. as low as .o pouncs o. f horsoivwcr per heur. t, ciisseu. "Vot the ';'-;p;f:.V N-t: . tiie six 8, most reti. cif.cier.-v. despite Jj.'pP: uses orditisrv conitin . -... stead of the liik-'.i-tcst !. aviation. , , ; .o.rsht t More than teat, t-'-p;-;.--. j; -C.. Stiio must run satt o';;;-., j,.. . v.irvint: fnnn V.'O rt'x 'p ' "''-'.:' ': n;e' to ;oh "hcress t.; itno need only confo.iT,--,..., ,vl. .ievehu-ed a! one si-c; ... ,. c,vo t'-e -;- ''1 v :,:i'''-0- ..,,,-. v "P- Vi e comwirtsoM so t- j, ;he of ii. iea.v 1 ' s' o. " ; orthi' r.c-cc Arrow cars ;-;t K the inlcr-iioiinlt'.tii '..r;sf'.' S a n d rod :i v 1 or Kn.!W- - |