Snap Roll:

From level flight, partial power, full up elevator and full rudder (lead with the elevator). Some planes require aileron as well, but that is not a "true" snap and may become axial. Other snap variations are possible. Also, for a spin, the plane should stall. You do not need to be vertical for this and a level entry makes a better presentation. If it still doesn’t want to snap, move the CG further aft. Just a little bit at a time, say 1/4 inch. A CG to far forward will make the airplane very stable in flight, and prevent the stall. 

Try doing a basic loop with a snap roll at the top, its really easier and looks great!

Lomcevak:

Its done a couple of ways but usually you begin on a 45 degree up line and execute an outside snap roll. Its kinda hard to do really well with most models since engine torque is what makes things happen.

Flat Spin:

Climb VERY high. Pull full throttle, full up elevator, full right rudder, and full right aileron. After a couple of turns, pull full low throttle. Start easing in left aileron. If the plane will flat spin, you should see the spin slow and flatten. Use full throttle and opposite controls to come out of it.

First clarification:

My drawings are of Mode 2: rudder and throttle
on the left, aileron and elevator on the right.


Second clarification of the diagrams:

To see them correctly, you need to set your browser
or your word processor to a fixed-pitch font
(e.g., Courier 10 or Courier 12).  If you're
reading with a proportionally spaced font,
the diagrams are all messed up.


Third clarification:

Dave Patrick says you probably will need
an aft CG, a powerful engine, a big prop,
and a small rudder with lots of throw to
really tumble.  He also suggests experimenting
with lower throttle settings because our
planes are often overpowered compared to
1:1 aircraft.


Fourth clarification:

     The book is from the publisher of Model Airplane
     News.

     Call (800) 537-5874.  $12.95 plus shipping.

     I believe every issue of MAN has a "Pilot's
     Mart" with an order form.  In December '97,
     the ad begins on p. 128 and the form is
     on p. 130.

     More details cheerfully supplied if you
     need them.

All that said, here is a repost of the
original set of formulas and diagrams:


Formulas for Lomcevak

            _Radio Control Airobatics for Everyone_
                  by David Patrick (pp. 42-44)

1. Classic

      A. Pull up at a 45-degree angle.

      B. Roll RIGHT to knife edge.

      C.  +------++------+
          |o     ||o     |
          |      ||      |
          |      ||      |
          +------++------+


2. Dave Patrick's Favorite

      A. Pull up at a 45-degree angle.

      B. Roll RIGHT to knife edge.

      C.  +------++------+
          |o     ||      |
          |      ||      |
          |      ||o     |
          +------++------+

      D. Wait until the plane is upside-down.

      E.  +------++------+
          |o     ||o     |
          |      ||      |
          |      ||      |
          +------++------+


3. Tim Nealy

      A. Pull up at a 60-degree angle.

      B. Roll LEFT to knife edge.

      C. (Optional) Throttle back to 50% power.

      D.  +------++------+
          |     o||      |
          |      ||      |
          |      ||o     |
          +------++------+


4A. Jim Stanton Outside Snap

      A. Pull up at a 60-degree angle.

      B. Roll LEFT to knife edge.

      C.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+

4B. Jim Stanton Right Cross

      A. Pull up at a 60-degree angle.

      B. Roll LEFT to knife edge.

      C.  +------++------+
          |     o||     o|
          |      ||      |
          |      ||      |
          +------++------+
      

5A. Jim Stanton Snap Snap

      A. Pull up at a 45-degree angle.

      B. Roll LEFT to knife edge.

      C. Perform a 3/4 Left Inside Snap:

          +------++------+
          |o     ||      |
          |      ||      |
          |      ||o     |
          +------++------+

      D.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+


5B. John Conrad Snap Cross Cross

      A. Pull up at a 45-degree angle.

      B. Roll LEFT to knife edge.

      C. Perform a 3/4 Left Inside Snap:

          +------++------+
          |o     ||      |
          |      ||      |
          |      ||o     |
          +------++------+

      D.  +------++------+  (Pete Kerezman stops here)
          |o     ||o     |
          |      ||      |
          |      ||      |
          +------++------+

      E.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+

6. John Osterud Outside Snap

      A. Pull up to an 80-degree angle.

      B. Roll inverted.

      C.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+
      

7. John Osterud Complex

      A. Pull up at a 45-degree angle.

      B. Roll LEFT to knife edge.

      C. "Tap" a bit of LEFT rudder (bottom rudder).

      D.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+
      

8. Wayne Handley

      A. Gently pull up to about 30 to 45 degrees.

      B.  +------++------+
          |     o||o     |
          |      ||      |
          |      ||      |
          +------++------+