Procedure:

Launcher:
1. 90˚ blade cut 2x4 four feet long.
2. Cut another 2x4 32 inches long.

3. Cut two 2x4’s 10 inches long.

4. 45˚ wood angle. Cut each end perpendicular to each other.

5. 32” 2x4 drill two holes on top of each other on 4x32 side on each end of the piece.

6. 90˚ blade cut 2x2 21.7”

7. 48˚ wood angle. Cut each end parallel to the other.

8. Screw 2x4’s together with 2” side facing up through pilot holes.

9. Screw 10” 2x4’s into corners with 4” side face down.

10. Screw 2x2’s together to make a point.

11. Mark center of 32” side.

13. Screw point to open end to form a brace.

14. Put three screws at an angle on each side 6” from the front and 6” from each other.

15. Cut rubber tubing 50” long.

16. String washers over each end and zip tie to keep them on.

17. Cut a 2x4 4 ¼” long.

18. put washers on second screw.

19. clamp on 2x4 with each side stretched equally.

20. Mark the center of the rubber tubing.

21. Screw 6” apart, equal distance from the centerline

Broom head:

1. 90˚ table saw blade cut 2x4 11” long.

2. 45˚ blade lower to 3/4” above table.

3. 4” side of 2x4 down blade just visible on the short side. Cut.

4. Move 1.5” to the left. Cut.

5. Repeat step #4 six more times.

6. Turn wood so that opposite side faces the blade and the blade is just touching the first slit. Cut.

7. Repeat step 4 six times.

8. 90˚ blade cut off extra at one end.

9. Middle of head carve out a hole for the rotator, using auger bit, on a drill.

10. Auger out a ¼” hole on either side of the middle spaced like on a curling broom shaft.

11. Drill a hole through the middle of the other all the way through that is big enough for a curling broom bolt.

12. Put a bolt through one hole with the head on the bumpy side. Secure it with a nut. Do the same with the other hole.

13. Cut seven strips of foam 1x3x6 and staple one to each bump.

14. Cover the bumpy side of the broom head with material and staple in

place.

15. Put the two bolts through the broom shaft and secure each with a nut.

Experiment:

1. Set up launcher. Center the center mark on the centerline and the middle of the brace above the centerline.

2. Have two helpers stand on either side of the launcher on the far end.

3. Put stone in launcher with rubber under the handle.

4. Pull stone back, twist it slightly and let go. Do not have sweepers sweep it. Measure, from the opposite end to the rock, how far it travels. Repeat twice more.

5. Using a different rock set it in the launcher and have the sweepers sweep it with hog hair brooms after the rock passes through the house. Measure, from the opposite end to the rock, how far it travels.

6. Launch the same rock as in step 4 and do not have the sweepers sweep it.  Measure how far it travels

7. Repeat step 5 with brownie broom.

8. Repeat step 6.

9. Repeat step 5 with synthetic head.

10. Repeat step 6.

11. Repeat step 5 with the new design.

12. Repeat step 6.
13. Repeat steps 5-12 four more times.
14. Launch the rock and do not have the sweepers sweep it. Repeat once more.