Twin engine pod Boeing 747

[pmn1]

http://www.secretprojects.co.uk/forum/index.php?topic=2817.new#new <div class="Discussion_UserSignature"> </div>

 

[3488]

Its quite a thing that a relatively minor rearrangement like that can make the 747 look so different.<br /><br />Does any one know why twin engine pods are not used on the 747?<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[scottb50]

I would think it safer to separate them in case one has an uncontained failure and takes out both. The B-52 and B-47 were forced into it because existing engines were only so powerful, also with six or eight engines lose of two isn't as significant as losing two out of four to a single failure. <div class="Discussion_UserSignature"> </div>

 

[JonClarke]

Twin wing-mounted podded engines were also used on on the Avro Ashton and Arado 234C, both were prototypes.<br /><br />Tail-mounted twin podded engines were used by the production VC 10 and Illyshin 62 airliners.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em>  Arthur Clarke</p> </div>

 

[scottb50]

True, and the Jetstar also had two rear mounted engines per side. In pretty much all these cases I would have to stick with the engines available at that time being of limited power for the size of the aircraft. The only alternative was four engines.<br /><br />Douglas built a prototype, that sta in ABQ for years, with four wing mounted engines to compete with the Jetstar for the initial government contract. The one advantage to rear mounting four engines rather then hanging them on the wings was the structural strengthening in the rear was not that much more then that in the center section and outer wing for four engines.<br /><br />If you look at the 737 wing, landing gear and engine loads are taken in one structure, in the DC-9 you have two separate load bearing structures which adds weight to the design. Advantages of rear mounted engines is a smaller and more efficient wing and better center of gravity control. <div class="Discussion_UserSignature"> </div>

 

[pmn1]

Tail-mounted twin podded engines were used by the production VC 10<br /><br />A test RB211 replaced on the twin pods on a VC-10 during the RB211 development. <div class="Discussion_UserSignature"> </div>