[NSRCA-discussion] Snap

[george w. kennie]

John,
I think I have a problem with #1.
I think the pilot's responsibility is to perform the maneuver correctly.
The Judges responsibility is to know what a correctly performed maneuver 
looks like and then to score it accurately.
The pilot has no responsibility to satisfy a judge who may be inept.
G.



----- Original Message ----- 
From: "John Ferrell" <johnferrell at earthlink.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, July 04, 2006 10:20 AM
Subject: Re: [NSRCA-discussion] Snap


> >From my point of view:
> 1. It remains the pilot's responsibility to satisfy the judges.
> 2. What is and is not a snap is defined by our rules.
> 3. All airplanes do not snap alike, see #1.
> 4. "Burying the Snap" by over controlling will eventually put you in a
> situation that will score poorly.
>
> IMHO:
> Those of us with a chronic problem of over controlling usually wind up
> selecting control travel limits based on what it takes to snap and spin.
> Those with the gift of fine motor control can get away with more sensitive
> controls.
>
> John Ferrell    W8CCW
> "My Competition is not my enemy"
> http://DixieNC.US
>
> ----- Original Message ----- 
> From: "Adam Glatt" <adam.g at sasktel.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Tuesday, July 04, 2006 2:26 AM
> Subject: Re: [NSRCA-discussion] Snap
>
>
>> Bob, my personal experience tells me that such a snap roll is only
>> possible with little to no elevator, and decent amounts of aileron and
>> rudder.  This shouldn't be a great surprise to anyone who has thought
>> about the control inputs we prescribe to perform a snap.  Elevator input
>> causes the plane to pitch, and pitch causes the plane to displace from
>> its former path, whether the wing is stalled or not.  Rudder causes the
>> plane to yaw, but yaw is much less effective at causing the plane to
>> displace from its former path.  Rudder during a roll forces the tail and
>> nose to rotate around the flight path.  What two things can a judge or
>> pilot look for during a roll to determine if it is a standard roll,
>> barrell roll, or a snap roll?  The first is the tail being at an angle
>> that isn't the flight path and then not rotating around the flight
>> path.  The second is the CofG staying on a rather straight path.
>>
>> A stalled wing (due to elevator application) produces a ton of lift.
>> That lift is going to drastically move the CofG off the previous flight
>> path.  This is why I advocate and practice very little elevator
>> deflection during a snap.  Meeting the rules requires strong elevator
>> application to begin the snap, and it also _requires_ releasing most of
>> that elevator during the rotation.
>>
>> Of course, this is all just talk and typing.  Most important is to
>> ensure your snaps don't tempt judges to whip out the big zero.  And that
>> you can hit wings-level every time.  Jeez, I better keep practicing...
>>
>> -Adam
>>
>> Bob Richards wrote:
>>>
>>> */Nat Penton <natpenton at centurytel.net>/* wrote:
>>>
>>>     When the stall occurs lift only diminishes, it does not go to zero.
>>>
>>> Agreed, and therefore the CG of the plane can't travel a straight line.
>>>
>>> The "break" will cause the the wing to go through its maximum lift
>>> AOA. That alone will cause the path to deviate. Once "stalled" the
>>> wing is still lifting, 3D flying proves that.
>>>
>>> I recently flew a plane that was being video taped, and performed
>>> several snap rolls coming straight towards the camera. When the
>>> playback was slowed down, it was apparent the plane was NOT following
>>> a straight path. The plane obviously stalled, and autorotated, but the
>>> path was a spiral.
>>>
>>> I would like for someone to produce a video of a snap roll, flown
>>> straight towards or away from the camera, where the CG stayed on a
>>> straight path.
>>>
>>> Bob R.
>>>
>>> ------------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> NSRCA-discussion mailing list
>>> NSRCA-discussion at lists.nsrca.org
>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>
>> _______________________________________________
>> NSRCA-discussion mailing list
>> NSRCA-discussion at lists.nsrca.org
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>