130-28029 Parallax Inc, 130-28029 Datasheet - Page 253

• Manufacturer Part Number: 130-28029
• Description: KIT PARTS SMART SENSORS
• Manufacturer: Parallax Inc

Specifications of 130-28029

• Accessory Type: Education Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Chapter 6: Accelerometer Projects · Page 241
About the Ollie
The first documented ollie was done by Alan (Ollie) Gelfand in the late 1970s. Gelfand
pioneered it in ramps and bowls. The flatland version of the ollie evolved in the early
1980s. When a skater does an ollie, he jumps, and it looks like his board is attached to his
feet, even though it's not.
Regardless of the environment or skating style, most
skateboard tricks today are variations of the ollie.
Ollie Mechanics
Figure 6-14 shows the mechanics of an ollie. As the skater jumps, (a) his feet are both
pushing the board down. Just before the skater is about to become airborne, (b) he lifts
his front foot and at the same time extends his back foot to tiptoe, and the tail of the board
smacks the concrete. The momentum of the front of the board keeps it rising (c), and the
skater now lifts his back foot, and kicks his front foot forward. This causes the back of
the board to rise (d), and move slightly forward. As the deck meets the skater's back foot
(e), the skater applies just enough pressure to keep the board against his feet as it falls
back to the ground (f). The highest ollie to date, performed by Danny Wainwright, was
in excess of five feet high.
Figure 6-14: Ollie Mechanics