Va ???
- Thread starter Flying_Corporal
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Foxcow
Well-Known Member
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I think we should be saying that to you if you still think thats how Va is defined...
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Silence speaks louder than words bud. Play nice in the sandbox, or it's a time out for you. Or you can stop acting like a child.
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yes mom...
I wasn't trying to be mean. Im just in disbelief...
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I think we should be saying that to you if you still think thats how Va is defined...
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Silence speaks louder than words bud. Play nice in the sandbox, or it's a time out for you. Or you can stop acting like a child.
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yes mom...
I wasn't trying to be mean. Im just in disbelief...
Brendan
New Member
Whether or not you were trying to be rude, it seems like your post was a little offensive to someone who was trying to make a very valid point. Since you disagree, lets hear how you have learned the definition of Va. I would post mine, but it is exactly the same as RiddlePilots, so a post from me would be moot. It's best to disagree and be subverse when you can back up what you are trying to say.
Foxcow
Well-Known Member
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let's work with some hypothetical numbers. let's say you have an arrow at max gross weight - 2750# cruising around at 118kts, which is the Va for that weight. it's operating at, hypothetically, 7* AOA. critical AOA is, say, 17*. if you make a full abrupt stabilator deflection at this speed and weight, the wing has 10* AOA to travel before it stalls out. if this input is applied, the airplane will, in fact, reach that critical AOA and stall out before it reaches the 3.8g limit load factor. if you have the same arrow at 2000# travelling at the same 118kts, let's say it's operating at 2* AOA. now if you apply full abrupt stabilator deflection the airfoil will have to travel 15* to stall out. since the wings have to pitch up 50% farther, it takes that much more time to reach the critical AOA, all at the same time the airplane is being accelerated (load factor). the limit load factor will be exceeded before the airplane stalls out. the whole point of Va is to ensure that you could make a full abrupt control deflection and not break the airplane....the only way to ensure this is to make sure that the airplane stalls out before it has a chance to hurt itself.
good enough explanation?
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Is that good enough? Lets end this now...
let's work with some hypothetical numbers. let's say you have an arrow at max gross weight - 2750# cruising around at 118kts, which is the Va for that weight. it's operating at, hypothetically, 7* AOA. critical AOA is, say, 17*. if you make a full abrupt stabilator deflection at this speed and weight, the wing has 10* AOA to travel before it stalls out. if this input is applied, the airplane will, in fact, reach that critical AOA and stall out before it reaches the 3.8g limit load factor. if you have the same arrow at 2000# travelling at the same 118kts, let's say it's operating at 2* AOA. now if you apply full abrupt stabilator deflection the airfoil will have to travel 15* to stall out. since the wings have to pitch up 50% farther, it takes that much more time to reach the critical AOA, all at the same time the airplane is being accelerated (load factor). the limit load factor will be exceeded before the airplane stalls out. the whole point of Va is to ensure that you could make a full abrupt control deflection and not break the airplane....the only way to ensure this is to make sure that the airplane stalls out before it has a chance to hurt itself.
good enough explanation?
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Is that good enough? Lets end this now...
RiddlePilot
New Member
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Is that good enough?
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No, it's really not since you're quoting someone else's explanation verbatim. Had you come up with your own slant in your own words, or in the very least cited your credentials, this wouldn't have blown up in your face. For all I know, you're a PP-ASEL with a big chip on his shoulder.
I'm fine with ending this now as well.
Is that good enough?
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No, it's really not since you're quoting someone else's explanation verbatim. Had you come up with your own slant in your own words, or in the very least cited your credentials, this wouldn't have blown up in your face. For all I know, you're a PP-ASEL with a big chip on his shoulder.
I'm fine with ending this now as well.
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