Jon Letendre Posted September 15, 2017 Share Posted September 15, 2017 Link to comment Share on other sites More sharing options...
anthony Posted September 15, 2017 Share Posted September 15, 2017 yup. 1 Link to comment Share on other sites More sharing options...
turkeyfoot Posted September 15, 2017 Share Posted September 15, 2017 No. If a person is moving at the same rate as an escalator hes essentially standing still. On the other hand if the person in the same example was wearing a wind suit and there was sufficient air moving over him to provide lift then, yes, he might fly. The plane in the example is not provided any lift to overcome gravity. The speed needed to gain loft is nullified by the counter rotating conveyor. The better question is why does it matter? https://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/ Holding my breath for merjets answer. ;) Link to comment Share on other sites More sharing options...
KorbenDallas Posted September 15, 2017 Share Posted September 15, 2017 What turkeyfoot said, it can't take off as there isn't any air moving across the wings. Link to comment Share on other sites More sharing options...
Jon Letendre Posted September 15, 2017 Author Share Posted September 15, 2017 Hi Geoff, The plane sits atop freely-spinning wheels and is pushed forward by jets attached to the wings. Imagine standing on a skateboard on a moving walkway at the airport. There is a little bit of friction where wheels meet walkway and in the bearings of the wheels, so you are going along with the walkway just like the people with no skateboard underneath them. I am on solid floor beside the walkway. We hold hands and I start to walk in the direction opposite of the walkway. Will the walkway win this tug-of-war, will it pull you in its direction, or will I win and get you to come in my direction? Link to comment Share on other sites More sharing options...
BaalChatzaf Posted September 15, 2017 Share Posted September 15, 2017 2 hours ago, Jon Letendre said: Yes. The air moving over the wings will provided life and the engines or propellers will provide forward thrust. The plane will raise of the ground and go forward in the air. Link to comment Share on other sites More sharing options...
Jon Letendre Posted September 15, 2017 Author Share Posted September 15, 2017 Just now, BaalChatzaf said: Yes. The air moving over the wings will provided life and the engines or propellers will provide forward thrust. The plane will raise of the ground and go forward in the air. Just like every other takeoff the plane has ever taken. only difference is her wheels will be spinning at double the usual rate, and backwards. Link to comment Share on other sites More sharing options...
Jon Letendre Posted September 15, 2017 Author Share Posted September 15, 2017 Sorry, not backwards, just double the usual rate. Link to comment Share on other sites More sharing options...
Jon Letendre Posted September 15, 2017 Author Share Posted September 15, 2017 It is interesting to note, also, that the conveyer can run in either direction at any speed, it can even switch directions while the plane is accelerating for takeoff - with no effect on the plane's forward progress and eventual takeoff. Edit: I almost forgot Bob is on the forum. There will be a small dent in plane acceleration if the conveyer switches direction during takeoff, due to the rotational inertia of the wheels. Link to comment Share on other sites More sharing options...
Jon Letendre Posted February 8, 2020 Author Share Posted February 8, 2020 Do wind suits work when one is “essentially standing still”? Hilarious. Link to comment Share on other sites More sharing options...
Jon Letendre Posted February 8, 2020 Author Share Posted February 8, 2020 On 9/15/2017 at 9:16 AM, turkeyfoot said: No. If a person is moving at the same rate as an escalator hes essentially standing still. On the other hand if the person in the same example was wearing a wind suit and there was sufficient air moving over him to provide lift then, yes, he might fly. The plane in the example is not provided any lift to overcome gravity. The speed needed to gain loft is nullified by the counter rotating conveyor. The better question is why does it matter? https://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/ Holding my breath for merjets answer. Why does it matter whether you can figure out a very simple setup? It doesn’t. I was just wondering, Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now