The definition of an aerodynamic stall is when the critical angle of attack is exceeded. This was a big part of the private written exam. It's all about the angles and the effect that has on the airfoil. This is why the application of vortex generators make some aircraft (such as the 150) incredibly difficult to stall. With the vortex generators to keep the airflow from breaking up as quickly, there is not enough elevator authority to exceed the new critical angle of attack.
This site explains the concept well: http://www.flightsimbooks.com/flightsimhandbook/CHAPTER_02_16_Basic_Aerodynamics.php This picture shows a hypothetical angle of attack vs critical angle of attack: http://zone.ni.com/cms/images/devzone/tut/ncezuttg46490.jpg " Angle of attack is the angle between the lifting body's reference line and the oncoming flow. " More simply put, the angle between the relative wind and the wing's reference line, which is shown in red in the picture I included. A stall at 115mph would be an 'accelerated stall', which occurs at a higher speed than your typical stall at 1g. You must've pulled back pretty hard or been very heavy. If you entered a spin, you were likely not coordinated. In order to get a tailplane stall you must either have had tailplane icing or a very aft CG condition. It's generally very difficult to impossible to accomplish. Regards, ~Matt On Wed, Apr 6, 2011 at 7:55 PM, Randy Smith <[email protected]> wrote: > I am not an engineer but I always understood if there is not enough air > across the wing it is stalled. so what does the angle have to do with no air > across the wing? I know if you pull up and block the top of the wing it will > stall. I have stalled the wing at 105 mph and the tail at 115 mph. For your > information it was not on purpose and I do not suggest it. The wing stall > did not do much I just let it fall off on one side and after the second spin > I pulled it out. The tail stall scared the **** out of my wife and I and she > said not to do that ever again, Like I would. > > --- On Wed, 4/6/11, Virgil N. Salisbury <[email protected]> wrote: > > > From: Virgil N. Salisbury <[email protected]> > Subject: Re: KR> Re: Tri gear tail first on runway. > To: "KRnet" <[email protected]> > Date: Wednesday, April 6, 2011, 12:29 PM > > > Full stall requires ~13 Degrees Angle of Attack. What is your AOA > sitting on the ground ? If it is less than~13 Degrees, Then full stall > is NOT > possible. As Larry says" you are at the SLOWEST A/S possible > for landing ", Virg > > On 4/6/2011 4:37 AM, phillip matheson wrote: > > Very true statement Larry. I have slammed my tail on the runway more than > > once and the tie down ring on my tail bears the wear to attest to the > fact. > > ------------------- > > > > Strange. > > > > I have 335 hours on my KR2 tricycle, and NEVER hit the tail. > > > > I can stall onto the runway, or drop the mains on the runway at 35 to 40 > > kts. > > > > Phil Matheson > > SAAA Ch 37 > > http://www.philskr2.50megs.com/ > > > > _______________________________________ > > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > > to UNsubscribe from KRnet, send a message to [email protected] > > please see other KRnet info at http://www.krnet.org/info.html > > > > > > _______________________________________ > > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > > to UNsubscribe from KRnet, send a message to [email protected] > > please see other KRnet info at http://www.krnet.org/info.html > > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html >
