Piedmont Aviation News — Page 2, Friday, September 28, 1945 J Isu’t it about time for another party, Kiss Adams — before cold weather sets dn? NEV7S FRCM THE FLIGHT DEPARli/iENT kessrs. Gurney Smith and W.C. Baker are making a cross-country trip to Detroit, i/iichigan. With Navigator Baker aboard we are sur’e Pilot Smith will not miss the airport more than a few feet, kr. Frank Groat is traveling this week. Thursday he made a round trip to Charles ton, West Virginia, and on Friday ho leaves for Washington, D.C. to spend a couple of days. Mr. Charles Vestal has returned from_ Lock Haven, Pennsylvania, where he visited the Piper factory. He reports that their strike is over ajid they will soon be in full production. The shop welcomes this news. I'Jhen arc H. Brendle and W.C. Baker taking their private's Flight Test? Baker should be through his spins by now. kiss Nell Adams is learning to fly. She did acrobatics in the F^an with Pilot Gurney Smith at the controls• AVIATION VOCABULARY Dihedral; A wing design in which the wing tips are raised above the center section portions of a wing. Its^effect is to improve its lateral stability. Cathedral; A condition in which the yjings slope downvjard from the plane of symmetry of the airplane• (Through a typographical error the v/ord "ANGLE" was spelled incorrectly in last week’s issue of the News.) Angle of Incidence; A fixed angle be tween the plane of the wing chord and the line of thrust or any other longitudinal line which is level when the fuselage is level longitudinally. Angle of incidence is the same as angle of wing setting* PCIM; A designation found on Page 1 of the "Operations Record (Form 309) which signifies that the aircraft in question is an (P) airplane, a (C) Cabin plane, a (L) Landplane, and a (M) Monoplane. New words for next week: STRUT, SPAR, CASTLE NUT, POLM VffilGHT and BALAImCE by F. H. Ponish When additional equipraent affecting the aircraft balance is installed in an airplane, or when such equipment is re moved from the plane, the new C.G. location has to be calculated. This cal- culation is really ver-y simple. You know from your previous vjork that Moment is the product of a weight and its arrri. Keep this in mind and you should not have any trouble. Let us find the now empty C.G. locatioi of an airplane after we install a battery weighing 20 lbs., on an arm of / 3. Before the installation of the battery, the aircraft empty weight was 687 and the C.G. location 15.72* Arrange your work as follows; Yft. Am Moment (lbs.) tSi.) (in.lb.) AEW 687 Battery 20 New AM/ 707 New C.G. Location = 10859*64 = 15.36 707 In the above case v/o added a 20 lb. weight to the AEV/, giving us a new kW of 707 lbs. By dividing the sum of the; moments by the new AEW weight, we ob tained the new C.G. location of Ip.3^. PROBIEtiS; lbs., C.G. Location—13.45. The following equipment was installeo. this airplane; Radio transmitter, 20 arm / 42; Radio receiver, 15 lbs. aiv / 4; Batte:^, 30 lbs. arm / 1. Fxna . C.G. Location. Answer; 13.51 15.72 3,00 10799.64 60.00 10859.64

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