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Technical Paper

Application of a Panel Method (QUADPAN) to the Prediction of Propeller Blade Loads

A study was conducted to demonstrate the ability of a low order panel aerodynamic flow code to predict the aircraft-induced propeller plane flow field and the resulting steady state propeller blade loads for a single-rotation, wing-mounted tractor system. Comparisons between predicted and measured flow field surveys and resulting blade loads, including the first five harmonics, were made for the U.S. Navy P-3C land-based patrol turboprop aircraft. The study showed that low order flow codes accurately model the induced flow field.
Technical Paper

Re-engining Studies on the P-3 Aircraft

The incentives for re-engining the Lockheed P-3 ASW Patrol aircraft include reduced fuel consumption and therefore reduced operating costs (the P-3 currently accounts for 16 percent of the U.S. Navy's annual aviation fuel bill), increased mission effectiveness in terms of radius of action (ROA) and time on station (TOS) (when needed), increased sales potential/production life, increased service life, and reduced maintenance hours. For these reasons, Lockheed has for several years conducted both Navy-funded and in-house-funded engineering studies to identify the impact on performance and cost of re-engining the P-3 with either a derivative type or an all-new advanced turboprop (ATP) type engine. This paper discusses some of the results of these studies. In particular, the engines examined in these studies are compared from both a performance and installation design standpoint, with aircraft mission performance improvements identified.
Technical Paper

Cabin Noise Weight Penalty Requirements for a High-Speed Propfan-Powered Aircraft - A Progress Report

A non-dimensional parameter is developed and data provided to estimate the required mass penalty to achieve satisfactory interior cabin noise levels for advanced propfan powered aircraft. The cabin noise criterion is 80 dBA which is representative of present-day turbofan-powered aircraft interiors and was used by NASA in a related study. Numerical results are given here for an advanced narrow-body powered by two 10-bladed propfans, cruising at 0.70 and 0.80 Mach number, designated as the ATX-100.