Aerodynamic characteristics of a 1/6-scale powered model of the rotor systems research aircraft

A wind-tunnel investigation was conducted to determine the effects of the main-rotor wake on the aerodynamic characteristics of the rotor systems research aircraft (RSRA). For the investigation, a 1/6-scale model with a four-blade articulated main rotor was used. Tests were conducted with and without the main rotor. Both the helicopter and the compound helicopter were tested. The latter configuration included the auxiliary thrust engines and the variable-incidence wing. Data were obtained over ranges of angle of attack, angle of sideslip, and main-rotor collective pitch angle at several main-rotor advance ratios. Results are presented for the total loads on the airframe as well as the loads on the rotor, the wing, and the tail. The results indicated that without the effect of the rotor wake, the RSRA had static longitudinal and directional stability and positive effective dihedral. With the effect of the main rotor and its wake, the RSRA exhibited longitudinal instability but retained static directional stability and positive effective dihedral

Computer program documentation - SYSTID, system time-domain simulation program

SYSTID computer program for system time-domain simulation program in FORTRAN 5 for Univac 1108 compute

Computerized polar plots by a cathode ray tube/grid overlay method

Overlay is aligned with four calibration dots so it is not affected by CRT drift or changes in vertical or horizontal gain when producing Nyquist /frequency-response phase/amplitude/ plots. Method produces over 50 plots per hour

Monetary aggregates and output

This paper offers a general equilibrium model that explains how the observed correlations of money and output fluctuations may come about through endogenously determined fluctuations in the money multiplier. The model is calibrated to meet long run features of the U.S. economy (including monetary features) and then subjected to shocks to the Solow residual following a random process like that observed in U.S. data. The model's predicted business-cycle frequency correlations, of both real and nominal variables, share the following features with U.S. data: i) M1 is positively correlated with real output; ii) the money multiplier and deposit-to-currency ratio are positively correlated with real output; iii) the price level is negatively correlated with output [in spite of (i) and (ii)]; iv) the correlation of M1 with contemporaneous prices is substantially weaker than the correlation of M1 with real output; v) correlations among real variables are essentially unchanged under different monetary policy regimes; and vi) real money balances are smoother than money demand equations would predict. Although features (i) and (iv) may have been considered support for a causal influence of money on output, the paper demonstrates that they are consistent with an economy in which money has no such causal influence.Money supply

Project for the analysis of technology transfer

The special task of preparing technology transfer profiles during the first six months of 1971 produced two major results: refining a new method for identifying and describing technology transfer activities, and generating practical insights into a number of issues associated with transfer programs