By the current paper, lift force that is an important characteristic of a planing hull is calculated. To accomplish this task, Morabito’s mathematical model that has been previously derived for prediction of total pressure distribution on planing hulls is utilized. These equations are not restricted to any specific mean wetted length and can be used for planing hulls with large value of mean we...

Abstract The aerodynamic characteristics of NACA4412 airfoil with different pitching motion elements were compared and analyzed based on CFD in this research. results are acquired as follows: the difference between lift drag coefficients during pitch up down motions becomes larger increase amplitude or initial angle attack; increases, coefficient grows slightly greater much greater; attack slig...

Abstract To compute the maximum speed threshold for helicopters, we model lift produced by rotor blades. Using this model, derive limits each method traditionally used to alleviate dissymmetry of lift. Additionally, find minimum angular velocity required produce a prescribed at given forward velocity. We conditions on coefficient helicopter airfoils that maintain altitude. Further consideration...

Abstract Studying the effect of leading-edge parameters 30P30N on aerodynamic characteristic was carried out. Effect changing gap and overlap slat airfoil were mainly investigated. Numerical simulation applied to obtain characteristics, results show that: lift coefficient in linear segment basically does not change with gap, drag decreases gap. The have obvious lift-to-drag ratio. smaller betwe...

Hiring committees address the glut of highly qualified applicants for faculty positions by experimenting with new evaluation methods and adapting their expectations for today's increasingly competitive academic environment.

Abstract This work investigates time-dependent ferrofluid flow past in a cylinder the presence of 10 kilo-ampere per meter magnetic field. The Reynolds number is about hundred to keep laminar and it high enough form von Karman vortex street. study presents results for velocity distributions, pressure lift coefficient, drag coefficient under influence stationary These are compared with absence f...

One of the factors which affects the gas lift performance is specific gravity of a lift gas (or the Molecular weight), which can influence the gas solubility in oil and has a direct effect on the gas lift performance. There are some previous researches which have included the lift gas specific gravity in their modeling, but in none of them, a comprehensive research about the effect of lift gas ...

Lockheed Martin Skunk Works, under a cooperative agreement with NASA, will build and fly the X-33, a half-scale prototype of a rocket-based, single-stage-to-orbit (SSTO), reusable launch vehicle (RLV). A 0.007-scale model of the X-33 604B0002G configuration was tested in four hypersonic facilities at the NASA Langley Research Center to examine vehicle stability and control characteristics and t...

Lockheed Martin Skunk Works, under a cooperative agreement with NASA, will build and fly the X-33, a half-scale prototype of a rocket-based, single-stage-to-orbit (S S T O) , reusable launch vehicle (RLV). A 0.007-scale model of the X-33 604B0002G configuration was tested in four hypersonic facilities at the NASA Langley Research Center to examine vehicle stability and control characteristics a...