Timeline for What produces thrust along the line of flight in a glider?
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 22, 2020 at 7:17 | comment | added | enbin | @TomMcW W has two components, Wn and Wt. Wt is in the same direction as V and opposite to D. | |
| Mar 22, 2020 at 7:13 | review | Suggested edits | |||
| Mar 22, 2020 at 12:52 | |||||
| Mar 22, 2020 at 6:27 | comment | added | enbin | K is not necessarily equal to W. | |
| Oct 25, 2018 at 2:08 | comment | added | Robert DiGiovanni | Now we get to airspeed vector, which is created by drag bringing acceleration forces into balance. | |
| Oct 24, 2018 at 22:17 | comment | added | quiet flyer | "The horizontal component of lift is not drawn (why?)"-- it's clear from the diagram that Lift, Drag, and Weight can be arranged into a closed vector triangle. That's all we need to know about what forces make gliding flight possible. | |
| Oct 24, 2018 at 22:15 | comment | added | quiet flyer | "Now, the question is "What creates force U?"" -- U is not a force. U and w are components of the airspeed vector V. | |
| Oct 24, 2018 at 22:12 | comment | added | quiet flyer | "I do not see the purpose of the line connecting K and L, other than to make it "seem" right."-- that is to show that the drag vector can be redrawn in that position, to show the K is the resultant (vector sum) of L and D. | |
| Oct 24, 2018 at 21:07 | comment | added | Robert DiGiovanni | Now, the question is "What creates force U?" | |
| Oct 24, 2018 at 21:06 | comment | added | Robert DiGiovanni | Michael, you need to speak to the person who made the diagram. I happen to be in full agreement with quiet flyer that it involves lift, drag, and weight vectors. If you have ever experienced building and throwing a free flight glider, and enjoyed its flight, you might understand my nit picking. Now start with a parachute (or hang glider), shift your weight in one direction what happens? Why? How does airfoil achieve proper angle of attack to function as a lifting device? How is straight line flight achieved and maintained? This is the core of understanding gliding. It interests me. | |
| Oct 24, 2018 at 16:08 | comment | added | Michael Hall | @Robert DiGiovanni, is there a specific problem you are trying to resolve here? I am having a hard time understanding your confusion over such a simple concept as a glider. | |
| Oct 23, 2018 at 23:17 | comment | added | Robert DiGiovanni | Although I do agree that vertical drag plus vertical lift create a steady state descent. | |
| Oct 23, 2018 at 23:12 | comment | added | Robert DiGiovanni | Force U is 90 degrees to gravity there for can not be created by it. The horizontal component of lift is not drawn (why?). Gravity cannot be moving the plane forward any more than gasoline can provide thrust. Is not the wing the "engine" of lift and thrust, as in birds? | |
| Oct 23, 2018 at 22:26 | comment | added | TomMcW | Airspeed is not a force. V would be the trust component. The question is what is providing the thrust component that is opposing drag. | |
| Oct 23, 2018 at 21:13 | comment | added | xxavier | The projection of the weight vector is the 'thrust' that opposes the projection of the aerodynamic force (drag). As those forces are in equilibrium, the motion is uniform, with a constant speed and zero acceleration. | |
| Oct 23, 2018 at 20:49 | comment | added | Robert DiGiovanni | Better yet, what generates "U"? | |
| Oct 23, 2018 at 20:37 | comment | added | Robert DiGiovanni | I was hoping someone would say V is a combination of velocity down and velocity forward (created by horizontal component of lift vector). Interesting that, even though acceleration forces are in balance. Can we have a "relative velocity" direction based on falling and moving forward at a constant speed? | |
| Oct 23, 2018 at 20:15 | history | answered | xxavier | CC BY-SA 4.0 |