WolstonFlyer Posted October 12, 2016 Share Posted October 12, 2016 This simple little question has caused a lot of healthy discussion on Facebook today. Edited By WolstonFlyer on 12/10/2016 21:07:49 Quote Link to comment Share on other sites More sharing options...
Phil Cooke Posted October 12, 2016 Share Posted October 12, 2016 It really doesn't matter how fast the wheels go round, no forward motion of the airframe = no aerodynamic lift = no take off. Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted October 12, 2016 Share Posted October 12, 2016 Yes - as long as the conveyor is long enough. The 747 is driven forwards by the jet engines, not the wheels. The wheels / conveyor might be turning, but that is irrelevant. Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Not according to about 80% of the people in the Facebook group where this was first posted. Edited By WolstonFlyer on 12/10/2016 21:16:26 Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted October 12, 2016 Share Posted October 12, 2016 Of course - what counter arguments have been raised? Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted October 12, 2016 Share Posted October 12, 2016 Does that answer the question or say something about facebook users? Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 You have to make your mind up. Can the plane take off based on the question. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted October 12, 2016 Share Posted October 12, 2016 This is a classic loaded Question because it presumes you will assume the engines are running because it talks about the speed of the wheels.... of course if the jets were running at full power it would take off because the motion is provided by jet thrust so the fact its sitting on a conveyor belt is irrelevant BUT nothing is said in the scenario stated to say that the engines are running at all, therefore in that situation the wheels would not be turning, the conveyor belt would not be moving (ie matching the speed of the wheels) and the 747 would remain motionless Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted October 12, 2016 Share Posted October 12, 2016 The question doesn't state whether the engines are running or not. If yes, then I'll agree with Gary. tim Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted October 12, 2016 Share Posted October 12, 2016 If it's a wordplay game, then it can't take of while it's SITTING on the runway (edit - conveyor). Edited By Gary Manuel on 12/10/2016 21:22:53 Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted October 12, 2016 Share Posted October 12, 2016 Nor can it take off if I'm just Imagining it sat there! Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 As far as I know it is a normal aeroplane, fully working. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted October 12, 2016 Share Posted October 12, 2016 What's facebook ? Quote Link to comment Share on other sites More sharing options...
Flyer Posted October 12, 2016 Share Posted October 12, 2016 The question is.... Can the plane take off???......... not is it. The plane can always take off, regardless. Whether it choses too is another question. Think I'll get back to my winter build............. Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Posted by john stones 1 on 12/10/2016 21:25:16: What's facebook ? A really strange part of the internet. Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Can the plane take off if the converyor belt is always moving the same speed as the wheels but in the opposite direction. Quote Link to comment Share on other sites More sharing options...
Flyer Posted October 12, 2016 Share Posted October 12, 2016 You need a winter build project Mr Wolston................. Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Posted by Flyer on 12/10/2016 21:30:46: You need a winter build project Mr Wolston................. I need to finish some of the models that I have started Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted October 12, 2016 Share Posted October 12, 2016 No Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Posted by john stones 1 on 12/10/2016 21:32:16: No Ahh, the first 'No' answer. Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted October 12, 2016 Share Posted October 12, 2016 The WHEEL (rather than the tire), will be moving at the same speed as the rest of the plane. The conveyor will move backwards, matching the speed of the wheels, which will cause the wheels to rotate, by virtue of the contact between the conveyor / TYRE. Q.E.D. Quote Link to comment Share on other sites More sharing options...
Martyn K Posted October 12, 2016 Share Posted October 12, 2016 If the conveyor belt is running at the same speed as the wheels. The top of the wheel is moving at the same speed as the bottom of the wheel but in the opposite direction so therefore the net speed of the wheel is zero. The conveyor belt is therefore not moving.. The aircraft will then accelerate normally and take off in the normal take off distance. Seemples. Quote Link to comment Share on other sites More sharing options...
Pete B Posted October 12, 2016 Share Posted October 12, 2016 Leaving aside the pedantry (and the imprecise nature of communication prevalent on t'internet), I think you have to assume the 747 is in full working order - and you have to ignore the picture and read the script carefully. Note that the conveyor belt is described as being as wide and long as a runway - not the foreshortened running machine in the pic which is a bit of an optical diversion, IMHO. If the engines are run up, the reaction to the thrust will move the 747 forwards, regardless of the conveyor belt. Once it reaches take-off speed, it will fly..... There you go - I've put myself on offer... Pete Quote Link to comment Share on other sites More sharing options...
Flyer Posted October 12, 2016 Share Posted October 12, 2016 The question was though ' can it fly'........and the assumption has to be yes, as it's a 747, regardless of all of the distractions. ...........now back to my sanding............ Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted October 12, 2016 Author Share Posted October 12, 2016 Posted by Flyer on 12/10/2016 21:52:22: The question was though ' can it fly'........ The question says 'can it take off' , not can it fly. Quote Link to comment Share on other sites More sharing options...
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