About 15 years ago our indoor free flight group were getting a little stale and needed a shot in the arm.  We decided to try our hand at having a rubber powered control line contest. We had a barrel of fun with the following events:

1. Distance - the greatest distance flown on one winding.
2. Speed Dash - Fastest time for two laps  .
3. Balloon Burst - Fastest time to burst the balloon.
4. 25 lap Team Race - multiple plane race with the required pit stops for rewinding.
5. Stunt - Most stunts (loops etc) done in 5 flights, bonus points for complexity.
6. Combat/Demolition Derby - Multiple plane event, last plane down wins  .

The Rules:
1. All the parts of the disassemble plane must fit or be drawn on a 11" by 17" sheet of paper.
2. Planes must ROG.
3. 8" prop.
4. 20' heavy thread lines.
5. 10 gram motor. This is 10 feet of 1/8" wide rubber looped to either 4, 6 or 8 strands depending on event.
6. No restriction on construction materials.

My designs were called the "Latex-Lancer" and are shown in the photos. We used to demonstrate these models to kids in the schools and let them have a go at it. These models work best in a gym or other indoor facility. For stunt you need at least a 30' ceiling. Although the flight times are rather short, the competition makes them a lot of fun  .

Orv. (ya gotta git older but ya don't gotta grow up!)

Should be possible to build a full size stunter , with say six ' motors ',
gear driven , with a load operated catch , so as a motor ' winds down '
the next one hooks in .
Might pay to putem in a carbon tube though. Max turns that way .