%0 Conference Paper %B 29th Annual Conference, Washington, D. C., May 4-6 %D 1970 %T 850. Automated Method for Calculating Mass Characteristics of Fuel in Tanks at Various Angles of Attack %A Jacobs, E %A Gholson, D P %K 05. Inertia Calculations %X (This paper is taken from a report entitled "Automated Weight Control" which resulted from Avco's IRAD effort.) An automated process for the calculation of mass properties for fuel volumes is the subject for this paper. The tank shapes are such that they can be approximated by subdividing into tapered boxes with straight line edges. The data are calculated for levels incremented every .25 inches and oriented at any angle of attack. The mass properties consist of total weight, three axis center of gravity and moment of inertia (LB. - IN. 2) and a product of inertia in the X-Z plane. The input consists of coordinates for the tapered box corner points, the Z intercepts for planes oriented at the angle of attack and passing through the lowest and highest corners in the box, the Z intercept for the initial cutting plane, the angle of attack with its tangent plus the tangent for twice the angle of attack, fuel density and an indicator to signal program termination. Special use is made of the prismoidal equation (Reference: SAWE Handbook, Page 4.2.8, V = h/6(A0 + A1 + 4Av)) for solving fuel level mass properties. Other techniques involve variations of FORTRAN logic and the use of the 1130 disc files for data storage and transfer. Due to the complexity and size of this program, it is not practical to detail its entire workings. The following discussion explains the function for each section of the program and the primary equations. Further aids are available with a program listing which has extensive comments with symbol definitions. With these aids and diligent dissection, the interested reader should be able to gain as much of a detail understanding and operational capability as he desires. %B 29th Annual Conference, Washington, D. C., May 4-6 %I Society of Allied Weight Engineers, Inc. %C Washington, DC %P 29 %8 5/4/70 %G eng %U https://www.sawe.org/papers/0850/buy %9 5. INERTIA CALCULATIONS %M 0850 %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE0850