Snap Roll Question

[storklappe]

On an Outside Snap Roll, do you "cross-control" the rudder and ailerons? (i.e., down elevator, left aileron, and right rudder)

If so, which determines the direction of the snap; the rudder or ailerons?

Thanks!

[Extra260]

the elevators and rudder determine if it is a negative or positive. a right negative snap would be right aileron down elevator and right rudder.

[Mike c.]

I think you mean left rudder

[Rolling Thunder]

	Quote: Originally Posted by storklappe
	On an Outside Snap Roll, do you "cross-control" the rudder and ailerons? (i.e., down elevator, left aileron, and right rudder) If so, which determines the direction of the snap; the rudder or ailerons? Thanks!

You have described the correct LEFT negitive snap. Aileron determines the direction. This is also the case with negitive spins, Aileron the direction of the spin and rudder is opposite.

Remember when you are inverted the rudder is backwards. But it doesn't matter what the attitude of the aircraft is, if they call for a negitive snap it is down elevator and opposite aileron and rudder. Even if you are upright.

[p sme]

i just looked at the title of this thread...it says "snal roll" made me think "snail roll", maybe an intersting new manuever. lol. Sorry for the off topic. I need some sleep.

[invert0914]

A snap roll is a stall maneuver. On some aircraft the snap can be done with just elevator and must times it’s to the right. Just remember the good old Cap 21 AKA snap 21!. There is a such thing as a cross-controlled snap. When performing a “loungcavuck” no clue how to spell it is usually began inverted and it’s a cross controlled maneuver. Sometimes though it turns out to be just an outside snap because the plane must cartwheel nose over tail to be “loungcavuck” no clue how to spell again. But whether positive or negative in must cases it would be rudder and ailerons in the same direction. Hope this helps.

[Rolling Thunder]

	Quote: Originally Posted by invert0914
	A snap roll is a stall maneuver. On some aircraft the snap can be done with just elevator and must times it’s to the right. Just remember the good old Cap 21 AKA snap 21!. There is a such thing as a cross-controlled snap. When performing a “loungcavuck” no clue how to spell it is usually began inverted and it’s a cross controlled maneuver. Sometimes though it turns out to be just an outside snap because the plane must cartwheel nose over tail to be “loungcavuck” no clue how to spell again. But whether positive or negative in must cases it would be rudder and ailerons in the same direction. Hope this helps.

In a negitive snap the rudder and aileron is not the same direction, NEVER!!

[wizard]

	Quote: Originally Posted by p sme
	i just looked at the title of this thread...it says "snal roll" made me think "snail roll", maybe an intersting new manuever. lol. Sorry for the off topic. I need some sleep.

I edited the title of the thread to correct the spelling. Don't feel bad. I had to backup about 6 times to correct my spelling in this post. LOL

[excelpoint]

Aileron will controll the direction of the snap and yes you cross the controls for a outside(negative) snap, either sticks in or sticks out depending on roll direction

[invert0914]

Thanks for the correction. Never to old to learn something new.

[Mike Bargman]

Negative snap:

Left Negative Snap - Bump Down Elevator, Left Aileron, Right Rudder
Right Negative Snap - Bump Down Elevator, Right Aileron, Left Rudder

Both inside, or both outside. Aileron determines direction of snap. If you push and both sticks go the same way, you get a "tumble"

[invert0914]

	Quote: Originally Posted by Rolling Thunder
	In a negitive snap the rudder and aileron is not the same direction, NEVER!!

Snap Rolls

Figure 1. (K=13)

Figure 2. (K=17)

Snap rolls also have to be flown normally on a straight line. A snap roll is similar to a horizontal spin. It is an autorotation with one wing stalled. Figure 1 shows the symbol for a regular snap roll. Figure 4 for an outside snap. In the regular snap, the plane has to be stalled by applying positive G forces. In an outside snap, the plane is stalled by applying negative G. In both cases rudder is then used to start autorotation in the same direction just like in a spin.
I copied this article from Aviat aerobatic intstructions. I thought maybe I was wrong but if you research you well find this information. This is a direct copie of the article. The figures for some reason did not copy over. So it seams that in both the positive and negative rudder and ailerons would be the same direction. Of course this applys to real airplanes and I guess it all comes down to how you like to snap roll your plane and how YOU achieve your best results!