La Nasa progetta gli aerei del futuro. In cielo nel 2025

aereo

La Nasa presenta gli aeroplani del futuro. L'agenzia spaziale americana ha rilasciato alcune immagini dei nuovi aerei commerciali che potrebbero scorrazzare nei cieli a partire dal 2025.

Al momento ancora in fase di progettazione, i velivoli 'lanciati' dalla Nasa erano già stati pensati lo scorso anno, quando l'agenzia statuinitense aveva assegnato i contratti per la realizzazione dei prototipi (tre modelli in particolare) a Lockheed Martin, Northrop Grumman e Boeing.

Tuttavia, prima dei voli ufficiali i nuovi aerei dovranno necessariamente rispettare alcuni requisiti, tra cui la riduzione del rumore, dei gas di scarico e del consumo di carburante. I nuovi velivoli dovranno operare in situazioni di assoluta sicurezza, grazie anche all'aiuto di moderni sistemi di gestione del traffico aereo.

Tra gli altri criteri vi sono la capacità di volare fino all'85 per cento della velocità del suono e di portare da 50 mila a 100 mila libbre (45 mila chilogrammi circa) il carico utile, considerando insieme passeggeri e merci.

I tre modelli:

1. Lookheed Martin

lockheed_plane

il più 'convenzionale' dei tre, molto simile a un aereo di linea standard. L'unica variante, se così possiamo definirla, è un unico motore nella parte posteriore. Ciò significa che esso dovrà essere il massimo dell'affidabilità visto che ad un suo guasto non potrebbero sopperire gli altri motori, come avviene attualmente.

2. Northrop Grumman

northrop_grumman_plane

Ha una fusoliera formata da due parti, come una coppia di gemelli siamesi in versione aeronautica. Ad un primo sguardo, sembra somigliare alla Spaceshiptwo, la navicella prodotta dalla Virgin Galactic e dedicata al turismo spaziale.

3. Boeing

boeing_plane

Sembra una versione stile cartone animato di un bombardiere, un mix tra un uccello e un aereo. Al di là del design, il modello sarà potenzialmente in grado di gestire un carico enorme. Inoltre, i suoi motori saranno montati sul tetto per ridurre il rumore di fondo.

Francesca Mancuso

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avg_ls_data.fireEvent("onrowenter"); // get the result return avg_ls_data.getAttribute("result"); } function avg_ls_get_image(result) { if ((result == null) || (result.length < 1)) return null; var strResult = new String(result); var parts = strResult.split("::"); if (parts.length < 3) return; var nSeverity = parseInt(parts[0]); var image = null; switch(nSeverity) { case 0: if (showCleanVerdicts) image = images[nSeverity]; break; case 1: if (showLowRiskVerdicts) image = images[nSeverity]; break; case 2: if (showMedRiskVerdicts) image = images[nSeverity]; break; case 3: image = images[nSeverity]; break; default: image = "linkscanner://unknown12.gif"; break; } return image; } // do the url check function avg_ls_check_url(doc, element, href) { if (avg_ls_has_image(element)) return; var result = avg_ls_call_func(doc, "MalsiteCheck", href); if (result == null) return; var parts = result.split("::"); if (parts.length < 3) return; var nSeverity = parts[0]; var riskCategory = parts[1]; var riskName = parts[2]; if ( nSeverity == 0 ) { // safe shortened urls will get checked at mouse over time if (avg_ls_filter_url(href, shortened_urls)) { // add onmouseover for anchors with shortened url avg_ls_add_event(element, "mouseover", avg_ls_mouse_over); return; } } // mark as processed element.setAttribute("avglschecked", "1"); // get the image from the result var image = avg_ls_get_image(result); if (image == null) return; var bgColor = background_colors[nSeverity]; var borderColor = border_colors[nSeverity]; // build the inline html var html = ""; html += "

"; html += ""; html += riskCategory + ""; html += riskName + " "; avg_ls_add_image(doc, element, image, html); } function avg_ls_add_event(obj, name, func) { if (obj.addEventListener) { obj.addEventListener(name, func, false); return true; } else if (obj.attachEvent) { return obj.attachEvent("on"+name, func); } else { return false; } } function avg_ls_remove_event(obj, name, func) { if (obj.removeEventListener) { obj.removeEventListener(name, func, false); return true; } else if (obj.detachEvent) { return obj.detachEvent("on"+name, func); } else { return false; } } function avg_ls_mouse_over(e) { if (e && e.srcElement && e.srcElement.href) { var element = e.srcElement; if (element.tagName == "A") { // check if it has an image already if (avg_ls_has_image(element)) { return; } // add the image, returns the anchor not the image avg_ls_add_image(document, element, "linkscanner://clock12.png"); // do the check and update in the background setTimeout(function() {avg_ls_check_and_update(document, element);}, 1); } } } function avg_ls_get_inline_image(element) { var nextElem = null; if ((element == null) || (element.firstChild == null)) return nextElem; nextElem = element.firstChild; while (nextElem) { if (nextElem.id && (nextElem.id.indexOf("avg_ls_image") != -1)) return nextElem; nextElem = nextElem.nextSibling; } return null; } function avg_ls_inline_hide_verdict(anchor) { var image = avg_ls_get_inline_image(anchor); if ( image ) { image.style.visibility = "hidden"; } } function avg_ls_check_and_update(doc, element) { var result = avg_ls_call_func(doc, "GetFinalUrl", element.href); if (result) { var result2 = avg_ls_call_func(doc, "MalsiteCheck", result); if (result2 == null) return; // remove the mouseover for this element, no need to fire again avg_ls_remove_event(element, "mouseover", avg_ls_mouse_over); // get the image from the result var image = avg_ls_get_image(result2); if (image == null) avg_ls_inline_hide_verdict(element); else { var img_elem = avg_ls_get_inline_image(element); if (img_elem) { img_elem.src = image; } } } } // function to find a url in a filter list function avg_ls_filter_url(url, filter) { var strUrl = new String(url); var parts = strUrl.split("/"); if ((parts == null) || (parts.length t the bounding rect for image(s) var imgRect = imageElem.getBoundingClientRect(); // half width/height (center) of element bounding rect var halfX = (imgRect.right - imgRect.left) / 2; var halfY = (imgRect.bottom- imgRect.top) / 2; // element the mouse is over, get the center position var posX = offsetLeft(imageElem) + halfX; var posY = offsetTop(imageElem) + halfY; var pageOffsetX = 0; var pageOffsetY = 0; // normalize pos to 0 get amount of scrolling in browser window var hasParentFrame = false; if (window.pageXOffset == undefined) // Microsoft IE { pageOffsetX = document.documentElement.scrollLeft || document.body.scrollLeft; pageOffsetY = document.documentElement.scrollTop || document.body.scrollLeft; var frames = document.frames; if (frames) { for (var i=0; i < frames.length; i++) { if (frames[i].document.getElementById(imageElem.id)) { pageOffsetX = frames[i].document.documentElement.scrollLeft; pageOffsetY = frames[i].document.documentElement.scrollTop; hasParentFrame = true; break; } } } } else { pageOffsetX = window.pageXOffset; pageOffsetY = window.pageYOffset; } posX -= pageOffsetX; posY -= pageOffsetY; //compensate for Firefox 3 if (posX < imgRect.left) posX = imgRect.left+halfX; // setup the offsets var offsetX = posX; var offsetY = posY; // calc where to display on page if ((windowX - posX) > posX) { // right offsetX += halfX; locateX = 1; } else { //left offsetX -= (flyoverX + halfX); } if ((windowY - posY) > posY) { // below if (posY < (windowY/4)) { offsetY -= halfY; locateY = 1; } else { offsetY -= (flyoverY / 2) - halfY; locateY = 2; } } else { // above if ((windowY - posY) < (windowY/4)) { offsetY -= (flyoverY - halfY); } else { offsetY -= (flyoverY / 2) + halfY; locateY = 2; } } // make sure we aren't off the screen if (offsetY < 0) offsetY = 0; if ((offsetY + flyoverY) > windowY) offsetY = windowY - flyoverY; // add page offsets back - if not in frame if (!hasParentFrame) { offsetX += pageOffsetX; offsetY += pageOffsetY; } posX += pageOffsetX; posY += pageOffsetY; var paddedOffsetX = 0; //provide space between icon and flyover var padX = 3; if (locateX == 0) paddedOffsetX = offsetX - padX; else paddedOffsetX = offsetX + padX; // set where to put the flyover flyover.style.top = offsetY + "px"; flyover.style.left = paddedOffsetX + "px"; avg_ls_displayinline(); } function avg_ls_displayinline() { var flyover = document.getElementById('avg_ls_inline_popup'); if (flyover == null) return; // show the flyover flyover.style.visibility = "visible"; } function avg_ls_hideinline() { var flyover = document.getElementById('avg_ls_inline_popup'); if (flyover == null) return; flyover.visibility = "hidden"; //invisible flyover.style.left = "-5000px"; } function offsetTop(element) { var offset = 0; while (element) { offset += element.offsetTop; element = element.offsetParent; } return offset; } function offsetLeft(element) { var offset = 0; while (element) { offset += element.offsetLeft; element = element.offsetParent; } return offset; } // --></span></p> </div> </div>"
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