H-Stab Anahedral
Hello,
I was wondering why some business jets have their H-stab as anahedral? Thanks. |
Could be all sorts of reasons - care to specify which aircraft?
|
|
H-Stab Anahedral
I was wondering why you'd make one word longer whilst simultaneously attempting to sound cool creating an ugly abbreviation.
|
The HS is simply an inverted wing because it needs to impart a downward moment in order to keep the nose up. So what you're looking at is an upside down wing nothing to do with stability as far as I know I'm sure someone will come through with a more detailed answer to your query but I hope this helps:)
|
The HS is simply an inverted wing because it needs to impart a downward moment in order to keep the nose up. |
From somewhere in the depths of fluid dynamics courses of fifty years ago, I have retained an impression that use of di/an-hedral was connected with roll stability. So what are the benefits of having the tail less stable in roll than the wing?
|
Discussed in 2005 here.
While on the subject of anhedral, can anyone put me out of my misery regarding why all of the Russian rear engined airliners have a pronounced anhedral on the wings. |
F-4 comes to mind.
|
On the ground, with the surface trimmed neutral, any ice that is melting in the sun might just sit there until it has a chance to refreeze. Add anhedral and voila! Ice gone.
(No I don't design aircraft - you're all safe :) |
|
Oops how coukd I forget about the total airfoil? I must stop slicing wings into infinitely thin sections :}
|
I must stop slicing wings into infinitely thin sections |
Zeffy's pic in post #3 should be a salutary lesson to all of the effect of excessive 'g' on a tailplane during a 'punchy' departure.
|
As I said, it could be several reasons.
Zeffy's photo is, I think, a Falcon, so let's take that. Tail anhedral will reduce the aircraft rolling moment due to sideslip, which will change the balance between dutch roll and spiral stability a little bit. But unless someone can say that the Falcon is "iffy" in either of those quantities that is unlikely to be the reason. In his book "JAR Professional Pilot Studies" Phil Croucher writes: Anhedral reduces the lateral stability. In the Falcon, where it is used on the tailplane, it improves flying qualities by reducing the effect of wing downwash |
F-4 stab anhedral was for aesthetic reasons.
|
F-4 stab anhedral was for aesthetic reasons
aesthetic - concerned with beauty or the appreciation of beauty. I almost choked on a peanut there..............................:D |
F-4 stab anhedral was for aesthetic reasons. |
F-4 stab anhedral was for aesthetic reasons.
From an FT course years ago, I recall a discussion which suggested that the original design called for a T-tail .. subsequently changed as that configuration wouldn't have made the cut for carrier operations. |
I recall a discussion which suggested that the original design called for a T-tail subsequently changed as that configuration wouldn't have made the cut for carrier operations. |
All times are GMT. The time now is 12:59. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.