[NSRCA-discussion] How I became an expert Snap Judge (TIC)

[Ron Van Putte]

Jerry's point is that the airplane can't get to the portion of the CL/ 
alpha curve to the right, above the critical alpha.  Too many Gs on  
the airplane at normal flying speed.

Ron VP

On Oct 16, 2009, at 12:36 AM, James Oddino wrote:

> The way I see it, most of the folks think that the wing is stalled  
> or it isn't.  This is not the case.  Stalled typically refers to  
> the portion of the CL/alpha curve to the right, above the critical  
> alpha.  The CL does not go to zero when alpha exceeds the critical  
> 15 or so degrees but drops with a relatively low slope.  That means  
> it is still providing lift.  It can also be at different values on  
> each panel.  This is what Jerry was talking about when he referred  
> to stalling the wing asymmetrically.  (See excerpt below).
>
> I submit we can create a similar asymmetrical Lift on the left side  
> of the curve, below the critical angle and produce a SNAP ROLL with  
> the application of ailerons.  This is probably not a true  
> autorotation that would occur with rudder and elevator only if we  
> were on the "stalled" side of the curve, but the resulting airframe  
> response looks the same.
>
> I rest my case, Jim
>
> I am not an aeronautical engineer.  Where is Jim Alberico when we  
> need him?
>
> On Oct 15, 2009, at 6:23 PM, Ron Van Putte wrote:
>
>> I was busy when this came in and didn't sit down to read it until  
>> tonight.  I'm an aeronautical engineer and EVERYTHING Jerry wrote  
>> made sense to me and I'm a picky engineer.  I hope everyone was  
>> able to wade their way through it and understood what Jerry  
>> wrote.  He used some technical stuff that may have slowed some  
>> down, but it was presented in such a way that most R/C aerobatic  
>> pilots should understand the logic.
>>
>> Well done Jerry.
>>
>> Ron Van Putte
>>
>> On Oct 14, 2009, at 5:12 AM, Budd Engineering wrote:
>>
>>> So what are we doing to make the plane present what appears to be  
>>> a snap roll when we can't actually be stalling the wing  
>>> asymmetrically to induce autorotation like many claim?
>
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