Newspapers / Piedmont Aviation Employee Newsletter / Sept. 21, 1945, edition 1 / Page 2
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Piedmont Aviation News - Page 2 Frid8.y, September 21, 1945 We -welcorae two new linemen this week. Ml*. Jnjnes Harvey feoiince and Mr. Orville Gray Burton, Our janitor, Arthur ChandJ.er, has returned from Vfeshington, He re ports that his daughter was serious ly hurt, but she is getting along fairly well now, WEIGHT AND BALANCE By F. H. Ponish You know now how to find the cen ter of gravity location measured from the front wheel axle. The en gineer designing the airplane makes use of a reference line on his drawings to locate all parts of the structure in the proper place. Such a reference line is called DATIM LINE, In all f/eight and Balance reports made for the CAA all arras have to be given with reference to the datum line. Let us suppose that the distance of the center of gravity location of a certain airplane is 15" from the front wheel axle. By consulting the Form 309 or the pertinent air craft specifications, the arm of the front wheel axle may be found. All arrris from the datum to the tailwheel are considered positive and from the datum to the propeller, all arms are considered negative. If you find the front wheel listed as having an am of / 2, the center of gravity location measured from the datm would be 15 / 2 or 1?" in the above case. If the arm were listed as -2, the center of gravity location from the datum vrould be 15 - 2 or 13", To make use of what we know so far, let us work the following actual problem, A J3C-65 vas 'weighed and the following data had been obtained: Net weight of left front vjheel 315 lbs,, net weight of right front wheel In working all problems from now on, use the following abbreviations: Left Front Ttifheel LW Ilight Front T/heel RW Tailv/heela TW Aircraft Empty Weight AHV Center of Gravity CG LW W km 315 lbs, 318 54 687 lbs. 54 X 200 - 15.72 “587 The CG location from the front wheel axle is 15,72. The CG location from datum is 15*72 / 3 or 18.72 PROBLE^.S: Find empty CG in all of the following problems, 1. m, 315 Ibs.j RW, 323 lbs.; TV/ 56 lbs. Distance between front vjheel and tailwheel axle 201”. Arm of Front Wheo.l / 3. Answer 19.22 2. m, 1376 lbs,; RW 1393 lbs.; WV 181 lbs. Distance botxveen front wheel and tailwheel axle 195", Arm of front wheel -2. Answer 9,96 3. LW, 331 lbs,; rav, 336 lbs,; TW 59 lbs. Distance between front wheel and tailwheel axle 201". Arm of front wheel / 3. Answer 19.33 AVIATION VOCABULAnr FIN- a fixed or adjustable airfoil, attached to an aircraft approximately parallel to the plane of symmetry, to afford directional stability, AILERON- a hinged or movable portion of an airplane wing, the primary func'-" tion of which is to impress a rolling motion on the airplane. Ailerons produc roll about the longitudinal axis, WASHER- a ring of metal, leather, or other material used for various purpoa as around a bolt or screw to form a so*. 3I8 lbs,, net tailwheel weight 54 lbs./or the head or nut. distance between front wheel axle jind tailwheel ?x;le 200", Arm of front wheel / 3. NEW WORDS; PYRALIN— A trade name for plastic win shield and window material used on air planes . It is usually made of either nitro-cellulose or cellulose acetate. Dihedral, Cathedral, Angel of Ineidence,~PCli(r
Piedmont Aviation Employee Newsletter
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Sept. 21, 1945, edition 1
2
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