View Full Version : About the sound just before stalling

12-23-2005, 06:43 AM
Hi there,

http://forums.ubi.com/images/smilies/10.gifjust a little question to experten to know if the sound one can hear just before stalling (or when putting lots of Gs in the game) is realistic? http://forums.ubi.com/images/smilies/16x16_smiley-surprised.gif Do one hear this kind of sounds in real life?

Thanks for answering!

Fw190 Pilot http://forums.ubi.com/groupee_common/emoticons/icon_cool.gif

12-23-2005, 06:48 AM
Yes.IT`s actually the airframe.Some planes give bigger,some smaller warning.

12-23-2005, 07:01 AM
Thanks Carguy http://forums.ubi.com/groupee_common/emoticons/icon_cool.gif

12-23-2005, 08:29 AM
As the airflow starts to break away and become turbulent close to the stall it makes the wings vibrate slightly; as a rule most aircraft wings are virtually hollow to save weight so this acts like a sound box - plus the vibrations are transmitted to the fuselage.

When think that what your effectively flying is an aluminium can, then you can understand how it sounds the way it does!

As carguy says this will differ dramatically depending on each a/c.

12-23-2005, 09:02 AM
...and it's called "buffeting", right?

12-23-2005, 09:57 AM
http://forums.ubi.com/groupee_common/emoticons/icon_smile.gifHe, he, what we can learn from guys who know! Thanks for giving explanations Tometheyak http://forums.ubi.com/images/smilies/25.gif

Fw190 Pilot http://forums.ubi.com/groupee_common/emoticons/icon_cool.gif

12-23-2005, 12:17 PM
Yes, it's called "buffeting." It actually is one of the best signs of a stall, and if it happens, it's usually best to recover from the stall.

12-23-2005, 02:30 PM
I even heard buffeting while flying a C152 at 100mph http://forums.ubi.com/images/smilies/16x16_smiley-surprised.gif

I love flying

12-23-2005, 02:58 PM
Originally posted by PBNA-Boosher:
Yes, it's called "buffeting." It actually is one of the best signs of a stall, and if it happens, it's usually best to recover from the stall.

thx bosher

12-23-2005, 05:02 PM
Actually the buffet you feel is not on the wing but the Tailplane........ take the 152 mentioned, that has a 1 degree washout from the strut to the tip (twist). stand at the end of the wing and look down it... this is so the angle of attack of the wing at the root is greater than that at the tip, the reason for this is twofold, one would not want the whole wing to stall at once as in the stalled condition you would loose aileron authority, therefore by allowing the wing to start stalling earlier at the root, aileron control is maintained and the dirty air coming off the wing hits the tailplane and causes buffeting over it's surface area and more importantly the elevators...... this has the advantage of allowing you to feel through the stick and hear that the wing is starting to stall at the wing root and allows you time to lower the nose to recover the situation, now for audible warnings, these vary, take the 152 again as an example, ok know those things you blow at parties with the horn in them that uncurl out as they inflate, well the 152 has one of those fitted the wrong way round to a tube that is connected to an opening in the leading edge. as the wing starts to stall the low pressure ( Centre of pressure) moves forwards and for a better word collapses over the leading edge and stalls the wing, as this point of low pressure gets to the leading edge it sucks air out through the hole and draws air in through the little reed valve from the cabin sounding a warning to the pilot that the aircraft is approaching the stall ( about 5 to 10 knots above it)

there are other systems like little metal plates that lift up in low pressure make a switch and electrically warn the pilot via a electric horn etc......
hope that helps...

see being an Aircraft Engineer does have its advantages............ http://forums.ubi.com/images/smilies/16x16_smiley-tongue.gif

12-23-2005, 05:29 PM
When you hear that rustling sound watch for wing dip and get ready to kick rudder the opposite way from the wing that falls. Though, not so hard as to throw yourself into a spin in the other direction...