About the model

What this is

The Balance Board Pro lab is an interactive model of the Ocean Waves Surfskate 34″, with a reverse-kingpin front truck and a standard rear truck. Explore the mechanism in the tour or follow a trick in study mode.

One input, the lean

The deck lean φ drives both trucks. The model relates the pivot axis angle α to steering δ and axle tilt β, then uses the axle base and the front and rear steering angles to compute a model estimate of turn radius R.

Measured values

Deck

86.3 × 25.5 cm

Layup

7 × 1.5 mm maple

Wheels

65 × 41 mm · 78A

Hanger

6.25″ · 159 mm

Bushings

87A · ~15 mm

Riser

3 mm

Estimated and provisional values

Axle to axle · est.

486 mm · photo estimate

Pivot axis front / rear · est.

66° / 50° · photo estimates

The front truck is a reverse-kingpin design; the rear is a standard truck. A standard truck's 45° is the reference.

Provisional: pivot angles and axle positions (photo estimates), axle width, concave, bushing diameter and lean limit. These values still need readings from the physical board.

What the model leaves out

The model runs each pivot axis through the axle centre, while the real pivot sits higher. The bushings are drawn, not modelled.

The ollie

The ollie is a model of time read from a reference video. The study follows BEND KNEES / POP / SLIDE, with controls to pause and examine the motion.

Credits and contact

Built by 7APP for Balance Board Pro, with three.js and the teardown kit. Read the licences and credits.

For questions and feedback, contact 7APP.