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Federico
Federico
11:15
sorry for not answering earlier.
in a sense, yes. to remove ads you need 200 rep on that site. also note that on aviation there are no paid ads, but on other sites yes (mostly the ones with the most traffic)
Dan Hulme
Dan Hulme
Stack Overflow's ads pretty much pay for the rest of the network
Federico
Federico
11:56
I can imagine, given the volume of traffic they get.
 
3 hours later…
Tanner Swett
Tanner Swett
14:52
So what's with "underbanking tendency"?
I've heard and read from various reliable sources that if a fixed-wing aircraft is in a shallow turn (less than about 20 degrees, maybe), it will tend to roll out of the turn.
But in every flight simulator I've ever tried it in, if I just take my hands off the controls, the bank angle gradually increases.
This matches what I think I know about the aerodynamics of the situation. The outside wing is moving slightly faster than the inside wing, so it will generate slightly more lift, rolling the aircraft a slight amount.
How do you reconcile this?
Are the books totally wrong when they talk about underbanking tendency? Are the flight simulators totally wrong when they predict a gradually increasing bank angle? Or is the truth more complicated?
ratchet freak
ratchet freak
different aircraft, different roll stability parameter
Tanner Swett
Tanner Swett
Does that mean that some aircraft have underbanking tendency and some don't?
Federico
Federico
15:32
different possible explanations
1. simulators are not perfect (and might simplify the simulation by only implementing the unstable spiral part)
2. each aircraft will have its own characteristics (so some might underbank while others don't)

I never heard of it, so I will not pronounce myself on the details
Dan Hulme
Dan Hulme
16:28
I've experienced underbanking in a Warrior
 
6 hours later…
Tanner Swett
Tanner Swett
22:38
And if there are fixed-wing aircraft that have underbanking tendency... how does it work?
The dihedral effect doesn't do anything in a coordinated turn.
But here's a question. Suppose I'm in a nice and shallow turn, of 15 degrees, keeping it coordinated. Then I take my hands off the stick and feet off the pedals.
Does it stay coordinated or does it become uncoordinated? And if it becomes uncoordinated, does it slip inside or slip outside (skid)?

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