Abstract: The present invention comprises an improved track which increases the speed of a gravity-driven racing car. Firstly, a micro-grooved wheel rolling surface increases the friction for lateral movement of the car wheels through a fingerprint effect, thus straightening the trajectory of the path to the finish line. Secondly, this effect also reduces the amount of sideways movement towards the central guide strip and the associated bumping velocity. Thirdly, a low-friction material on the central guide strip reduces the frictional drag when contacted by a car's wheels. Fourthly, the micro-grooved surface also reduces the contact area between the wheel and the track surface causing a reduction in rolling friction. Finally, the micro-grooved rolling surface in combination with the low-friction guide strip material have a synergistic effect since the coefficient of sliding friction between a wheel and low-friction guide strip material is lessened because of a reduction in lateral velocity of contact.

Abstract: The present invention comprises an improved track which increases the speed of a gravity-driven racing car. Firstly, a micro-grooved wheel rolling surface increases the friction for lateral movement of the car wheels through a fingerprint effect, thus straightening the trajectory of the path to the finish line. Secondly, this effect also reduces the amount of sideways movement towards the central guide strip and the associated bumping velocity. Thirdly, a low-friction material on the central guide strip reduces the frictional drag when contacted by a car's wheels. Fourthly, the micro-grooved surface also reduces the contact area between the wheel and the track surface causing a reduction in rolling friction. Finally, the micro-grooved rolling surface in combination with the low-friction guide strip material have a synergistic effect since the coefficient of sliding friction between a wheel and low-friction guide strip material is lessened because of a reduction in lateral velocity of contact.

Abstract: This invention relates to gravity-driven car racing, specifically an improved ramp, such as used in the popular Pinewood Derby race, which is cycloid shaped. The present invention eliminates excessive centripetal force and related problems such as car oscillation caused by prior art ramps which are curved too much or curved in the wrong places. The present invention comprises a ramp shaped as a section of a cycloid curve with the ramp bottom tangent to the horizontal coasting run. It can be shown mathematically that such a curve will produce the least possible centripetal force and associated friction increase in the car wheels as it accelerates toward the coasting run. The present invention causes a ramp to assume the cycloid shape by applying appropriate bending forces to the underside of the ramp. In a preferred embodiment, a hinged brace automatically applies the key bending force as the main support legs are lowered.

Abstract: This invention relates to gravity-driven car racing, specifically an improved ramp, such as used in the popular Pinewood Derby race, which is cycloid shaped. The present invention eliminates excessive centripetal force and related problems such as car oscillation caused by prior art ramps which are curved too much or curved in the wrong places. The present invention comprises a ramp shaped as a section of a cycloid curve with the ramp bottom tangent to the horizontal coasting run. It can be shown mathematically that such a curve will produce the least possible centripetal force and associated friction increase in the car wheels as it accelerates toward the coasting run. The present invention causes a ramp to assume the cycloid shape by applying appropriate bending forces to the underside of the ramp. In a preferred embodiment, a hinged brace automatically applies the key bending force as the main support legs are lowered.

Abstract: This invention relates to gravity-driven car racing, specifically an improved electrical timing start switch for race tracks such as used in the popular Pinewood Derby race. The present invention eliminates the imprecise coupling between the mechanical release of start posts and the subsequent generation of an electrical timer start signal by a separate micro switch-based contact. The micro switch is eliminated and the start post trigger release mechanism itself is insulated and wired as a normally closed contact that will essentially immediately start the race timer when activated. The difference in the time the start posts begin to move and the time the trigger “switch” activates the timer is then reduced to an extremely short and precise time. This time is that for mechanical movement propagation from the trigger release point to the start posts, only about 20 millionths of a second for a one lane track.

Abstract: An improved start gate for gravity-driven cars which is itself a gravity-driven compound pendulum. The pendulum includes a horizontal drop member rigidly connected at one end to a start post support rod which in turn supports a plurality of start posts. A trigger lever, when moved either directly or remotely, allows the drop member to fall as in a compound pendulum thereby rotating the start posts and allowing the cars to start. The embodiment teaches that the subsequent initial start post acceleration is approximately twice the car acceleration. The equations of motion are solved showing that the start posts are guaranteed not to interfere with car motion. A major advantage over prior art spring-loaded start gates is that the gate “slap” from stopping overly-forceful spring motion and the associated track jarring and car jostling is eliminated, thereby contributing substantially to a more smooth and fair start.

Abstract: This invention relates to gravity-driven car racing, specifically an improved electrical timing start switch for race tracks such as used in the popular Pinewood Derby race. The present invention eliminates the imprecise coupling between the mechanical release of start posts and the subsequent generation of an electrical timer start signal by a separate micro switch-based contact. The micro switch is eliminated and the start post trigger release mechanism itself is insulated and wired as a normally closed contact that will essentially immediately start the race timer when activated. The difference in the time the start posts begin to move and the time the trigger “switch” activates the timer is then reduced to an extremely short and precise time. This time is that for mechanical movement propagation from the trigger release point to the start posts, only about 20 millionths of a second for a one lane track.

Abstract: An improved start gate for gravity-driven cars which is itself a gravity-driven compound pendulum. The pendulum includes a horizontal drop member rigidly connected at one end to a start post support rod which in turn supports a plurality of start posts. A trigger lever, when moved either directly or remotely, allows the drop member to fall as in a compound pendulum thereby rotating the start posts and allowing the cars to start. The embodiment teaches that the subsequent initial start post acceleration is approximately twice the car acceleration. The equations of motion are solved showing that the start posts are guaranteed not to interfere with car motion. A major advantage over prior art spring-loaded start gates is that the gate “slap” from stopping overly-forceful spring motion and the associated track jarring and car jostling is eliminated, thereby contributing substantially to a more smooth and fair start.