Outside Snap Roll Question

[storklappe]

When you do an outside snap, do you "cross" aileron and rudder? i.e., down elevator, right rudder, and left aileron. Or, do you move the rudder and aileron the same direction?

[Animal Jesky]

In a negative snap you want to cross the ailerons and rudder like you said above.

Andrew

[GremlinX]

Are they the same, you just change backstick for an inside snap? I need to learn proper snaps too... Mine "wallow" in a barrel shape

[JoeAirPort]

Try right aileron with right rudder and down elevator. Does a very nice slow motion manuever if you get all the stick amounts correct. Looks very cool. Too bad the sims don't make WMV's directly or we could post examples of what we are talking about.

[Animal Jesky]

Keith,

For an inside snap you want to use the same rudder as aileron and up elevator. the way I try and describe what a snap should look like will be a cone where the point is the spinner and the open end is the tail of the plane.

So if you do a negative snap then the rudder is opposite of the aileron but when doing a positive the rudder is the same this is used to make the cone.

Andrew

[Shawn Berkheimer]

	Quote: Originally Posted by JoeAirPort
	Try right aileron with right rudder and down elevator. Does a very nice slow motion manuever if you get all the stick amounts correct. Looks very cool. Too bad the sims don't make WMV's directly or we could post examples of what we are talking about.

Joe, do this at an IMAC contest and it will be rewarded with a zero everytime. For inside or "Negitive" smaps as they are called in the IMAC community the aileron and rudder are always opposed in direction. For some myself incuded when the direction of the snap sets you up for the next manuver I will have my caller tell me "sticks in" or "sticks out"



Shawn

[bodywerks]

That's a good idea ("stick in" or "sticks out")!
Anyway, if that's all you are asking then yes, sticks in the opposite direction for an outside snap. Of course, to do it right will be a whole other discussion - there's more to it than just slamming the sticks into the corners. Doing it right takes some "flying" through the maneuver, the most important being showing a pitch departure prior to rotation and unloading the snap by removing the up or down elevator as soon as you show the pitch departure. Simply slamming the sticks will probably get you a zero in an IMAC contest, too.

[GremlinX]

Just so I have it right..... Inside snap(canopy in) is a negative snap. Positive snap is canopy out ? I am asking because this is probably like people calling it wrong with positive and negative castor and camber with cars...

[GROOVEN J]

You know how people do a positive snap to the left and to the right... What are the stick movements for a negative snap to the Right? Is it just the opposite?

[Big J]

A negative (or outside) snap to the right would require right aileron, down elevator, and left rudder (outside sticks). A negative snap to the left would require left aileron, down elevator, and right rudder (inside sticks).

[bodywerks]

Inside snap is a posative snap. A positive snap, basically, requires up elevator, and aileron and rudder in the same direction. An outside snap is a negative snap. A negative snap, basically, requires down elevator, and aileron and rudder in opposite directions. In other words, a negative snap to the left requires left aileron, but right rudder, and obviously down elevator for the pitch departure. A positive snap to the left requires left aileron AND left rudder, and obviously up elevator for the pitch departure. These are the only gyroscopic-type maneuvers you will see in precision aerobatics.
To really throw you off, a positive cross-snap is still up elevator, but aileron and rudder are in opposite (crossed) positions, and you typically just shove the sticks into the corners. You can get some pretty cool gyrations depending on how you enter it and manage throttle. then there is the tumble, which is what many people seem to think is an outside snap, but it isn't. It is down elevator, but ailerons and rudder in the same direction. Typically, slamming the sticks on this one will cause it to go into what looks like a positive snap. T actually get it to tumble, you typically need to use about half a stick of aileron instead of full stick.

[Shawn Berkheimer]

OK things are getting complicated here. For a negitive snap to the right from level inverted.


Bump just a tad of down elevator to show judges pitch departure

Come in with right aileron and left rudder while pushing just a tad more

Half way through get out of the elevator completly

The last 1/4 revolution you may need to bump up elevator to finish nose level


These are just the rough mechanics that will no doubt need to be polished as setups and airplanes will differ.


Shawn