Blended wings have more efficiency than today's wing design,high lift to drag ratio,more efficiency,less fuel rate ,it have lot of advantages so why not they used for commercial airplanes as well as military aircraft rather than UAV.
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asked Jul 27, 2015 at 12:44
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$\begingroup$ NO its not i have a different thought? $\endgroup$– Thangaraj SundaramoorthyJul 27, 2015 at 12:55
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$\begingroup$ Now that you have changed the title, you should probably explain what exactly you mean in the detailed text of the question. $\endgroup$– JulianHzgJul 27, 2015 at 12:58
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$\begingroup$ What of your question does the accepted answer of the proposed duplicate not answer? $\endgroup$– Jan HudecJul 27, 2015 at 13:05
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$\begingroup$ The already question is asked about why not blended wing passenger airplane in operation? i am not suppose to ask that type,why they not achieve more than subsonic speeds as it have more L/D ratio than today's wing design and what is disadvantages not to acheive supersonic speeds. $\endgroup$– Thangaraj SundaramoorthyJul 27, 2015 at 13:13
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2$\begingroup$ @ThangarajSundaramoorthy: But the answer on that question explains that blended-wing-body designs do not have more efficiency that today's wing designs, making the rest of the question pointless. $\endgroup$– Jan HudecJul 27, 2015 at 13:35
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1 Answer
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One of the few production designs that approaches a blended-wing-body was Lockheed Sr-71:
![Sr-71]](https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Lockheed_SR-71_Blackbird.jpg/300px-Lockheed_SR-71_Blackbird.jpg)
Surprise, with maximum Mach 3.2 it is also the fastest production aircraft ever built.
Because blended-wing-body does not have better L/D at low speed. But generating part of lift with the body has some advantage for high-speed aircraft as it allows smaller wings that is better for high speed (and worse for low-speed).
answered Jul 27, 2015 at 13:27