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#1
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On drag
Is it a fair assumption that at best L/D speed the drag will be the
least? Thanks in advance, Ramapriya |
#2
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On drag
No, because it is a ratio of lift over drag. You could
reduce lift and also reduce drag. L/D Ratio Because lift and drag are both aerodynamic forces, the ratio of lift to drag is ... Aerodynamicists call the lift to drag ratio the L/D ratio, pronounced "L ... www.grc.nasa.gov/WWW/K-12/airplane/ldrat.html - 13k - Cached - Similar pages aero This phenomenon is called (aerodynamic) ground effect. .... values could be reached, his X-112 achieved an L/D value as high as 23 in ground effect flight. ... http://www.se-technology.com/wig/htm....php?open=aero - 14k - Cached - Similar pages High-Lift Aerodynamics, Tables of Lift-to-Drag Ratios On Table 1 we have a summary of aerodynamic efficiency L/D (for high speed flows, transonic as well as supersonic, the efficiency is ML/D, ... www.aerodyn.org/HighLift/ld-tables.html - 6k - Cached - Similar pages [PDF] Efficient Aerodynamic Shape Optimization File Format: PDF/Adobe Acrobat - View as HTML Efficient Aerodynamic Shape Optimization. Antony Jameson ... Wing L/D. Wing L/D vs. Mach at fixed CL. Baseline. Redesign. - - - : Baseline. -- : Redesign ... aero-comlab.stanford.edu/Papers/jameson.iowa.add.2005.pdf - Similar pages Aerospaceweb.org | Hypersonic Waveriders - Vehicle Characteristics Hypersonic vehicle design issues, configuration, aerodynamic behavior, compression lift ... Maximum lift-to-drag ratios for hypersonic vehicles and the "L/D ... http://www.aerospaceweb.org/design/w...r/design.shtml - 27k - Cached - Similar pages Aerospaceweb.org | Ask Us - Ground Effect and WIG Vehicles The aerodynamic efficiency of an aircraft is expressed through a quantity called the lift-to-drag ratio, or L/D. In steady, level, non-accelerating flight, ... http://www.aerospaceweb.org/question...cs/q0130.shtml - 27k - Cached - Similar pages Aerodynamics for Students Again assuming approximate steady conditions where velocity and propulsion performance is kept constant and that the aerodynamic parameter L/D is maintained ... www.aeromech.usyd.edu.au/aero/perf/range/ - 10k - Cached - Similar pages wrote in message ps.com... | Is it a fair assumption that at best L/D speed the drag will be the | least? | | Thanks in advance, | | Ramapriya | |
#3
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On drag
Jim Macklin wrote:
wrote in message ps.com... | Is it a fair assumption that at best L/D speed the drag will be the least? No, because it is a ratio of lift over drag. You could reduce lift and also reduce drag. For a given aircraft flying straight and level, lift=weight. Unless the weight's changing (or you accelerate the aircraft by turning), the lift doesn't change as you change speed - it still has to equal the weight to keep the plane in the air. Given that, then yes - maximizing L/D minimizes drag. Obviously there are many cases where this won't be true, but for the most part, it is. -- Marc J. Zeitlin http://www.cozybuilders.org/ Copyright (c) 2006 |
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