The problems I had with doing a good snap at first was the way I released the sticks.
It's what I term as flicking the sticks. I just release them causing the sticks to return back to center with a giggle.
This will joit the model slightly combine with a slight moment of wing stall after a snap.
Anyway, it wasn't consistent for the model's tracking.

It was an auto behavior becuase I didn't even notice I was doing it half of the time from playing vedio game.
My flight instructor had to stand next to me and constantly remind me to stop doing it to retrain me.

Don't fight the model.lol
You can snap an SE to the moon becuase of the design. The model won't alter from it's rolling axis as much,
vers..a trinner or 4* will be more of a barrel roll.
Why do you think I clipped the wings and lower the diehedral on all my 4*.

To retrain myself from flicking the sticks while doing a snap roll. I had to do it all backwards.
I simply try to make a lomcevac becuase the lomcevac require me to slide the elevator stick up.
A flat spin requires me to slide the airlerons. None of those maneuver looked right..but that wasn't my instension.
My intensions was to build a habit of sliding the sticks instead of jamming them then flicking them.

Another good manuver is...doing the consecutive rolls or multy rolls.
This will require you to rock the elevator up and down with rythem to maintain a level flight path,
which will get you in the habits of not flicking the sticks.

Also try "OUTSIDE" snaps. Elevator FORWARD instead of back. Note: have altitude or garbage sack. Learn how your plane responds at a safe altitude before attempting lower.

I remember trying a snap roll for the first time. Scared the bejezus out of me. [X(]

I gave it several trys today to snap my arrow with only rudder and elevator and it just was not working for me. holding both at max did not really do anything impressive.

You need more throw.

Set your rudder for all the throw you can get.

Gradually increase the elevator throw until you can get enough to snap. It's the elevator that causes the stall, and the rudder that causes the rotation. The biggest key is to have enough elevator available. You must be able to bring the wing to the very edge of stall. Rudder pushes it over the edge.

I'd recommend increasing your elevator throw, and setting a low rate at your current throw. That way you can take off with familiar throws, then turn'em up in the air for some snap-happy fun. Once you get used to the increased throw, you may or may not ever use the low rate again, but for the first time, it's comforting to know it's there....

J

I already have my controls surfaces moving about triple what the manauls specifies and does loops as tight as I dare (fearful any more elevator will break something) my rudder is as far as the hindge will allow it to move. it has more than enough rudder to knife-edge. I am wondering if I am just at the limits at what can be expected from a high-wing trainer, since it is designed to be stable.

Adui did you have any luck with the snap roll? will yours snap on elevator and rudder alone?

Move the CG back closer to the aft limit. Do this gradually.

that is a good idea. I recently moved it back just slightly and being a beginer it really got my attention as far as it flying different.

something funny about my Hangar 9 manual is that for the CG and the control movements it does not specify a range for any of these. It just tells on single figure of where they want it to be (CG, rudder, aileron, and elevator). regarding the CG is it a rule-of-thumb that it will not fly if the CG is moved behind the center of lift (which would be about the center of the wing)?

Unless you have enough elevator to cause the plane to not loop successfully anymore (with full ele, it should try to roll out of a loop, or do a polygonal loop (stall, catch, stall, catch) then there's not enough elevator. If the plane's well built, there should be no worry about damaging the wing, though this manouver can expose inadequate construction.... Sounds like you've got piles of rudder available.

Some aircraft may benefit from a bit of aileron, but it's not generally required. Can't hurt to try . I'm performing them with a .25 powered high wing flat bottom 3 channel trainer, rudder/ele only. When I apply full up elevator, it's loops begin to show alot of roll tendancy, as my elevator throw is excessive... About 35 degrees. It's the Aamco (Andrews) S-ray shown in my profile, a heavily bashed version of a trainer kit marketed in the late '60's, about as gentle a flier as you could ask for.... Unless you force it to snap!

Remember, though, this is a high-stress, violent manouver involving abruptly stalling one wing panel, and the craft will rotate 3-4 times quicker than it can with just aileron. There is no guarantee (ever) that your plane will survive (99%+ will survive )


J

Move the CG back and try it at a lower speed.

Planes with CG too far aft can be tough to control. This is why you move the CG in small amounts. You have a trainer so the specified CG is more likely toward the forward limit. Moving the CG aft MAY also allow for slightly slower landing speeds but, as always, be careful of major changes.
http://www.allstar.fiu.edu/aero/flight43.htm