Timeline for Where does the factor 1.3 for Vapp come from?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Apr 19, 2019 at 23:05 | comment | added | Robert DiGiovanni | Well, realizing there is not a universal approach speed is constructive. I have listed several reasons why a pilot should at least be aware of this issue. I hope my edits have helped. | |
| Apr 19, 2019 at 23:02 | history | edited | Robert DiGiovanni | CC BY-SA 4.0 |
Clarification
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| Apr 19, 2019 at 22:49 | comment | added | Ryan Mortensen | Even that portion of the AIM does not explain -- Why 1.3? I would give my own answer, but I haven't because I don't know the answer to the specific, why?, question asked. Otherwise, I would be giving an opinion-based guess without documentation, which isn't appropriate for this format. | |
| Apr 19, 2019 at 22:44 | comment | added | Robert DiGiovanni | Ok, I'll go with that and a NOTAM for people who approach slower than trainers such as the Cessna 172. See math in my edit, and thanks for getting me to dig a little more. | |
| Apr 19, 2019 at 22:40 | comment | added | Ryan Mortensen | The "textbook" answer of either Vref or (1.3*Vs0) if Vref isn't published is found in the AIM. 5-4-7 first and second sentence regarding approach category of aircraft. | |
| Apr 19, 2019 at 22:34 | comment | added | Ryan Mortensen | Where do we get 1.3 is the OP's question. | |
| Apr 19, 2019 at 22:25 | comment | added | Robert DiGiovanni | The point is textbook theory does not fly a plane. And I would like to know which textbook you are referring to. And yes, we have not discussed flaps yet. But the point is there is enough variation to get qualified opinions and training to be safe for the type of aircraft one pilots. Now the faster one gets, the farther 1.3 gets away from stall speed. Example stall at 100, 1.3 x 100 = 130. Stall at 30, 1.3 x 30 = 39. This can be crucial at slow speeds in wind. So where do we get 1.3 ??? | |
| Apr 19, 2019 at 19:50 | comment | added | Ryan Mortensen | You aren't wrong, but you did not answer his question. Since, clearly, every situation is different as you've pointed out. Why is 1.3 the textbook number? | |
| Apr 19, 2019 at 19:37 | history | edited | Robert DiGiovanni | CC BY-SA 4.0 |
added 18 characters in body
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| Apr 19, 2019 at 19:24 | history | answered | Robert DiGiovanni | CC BY-SA 4.0 |