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Mvc-002f.jpg (53121 bytes)  Hoverboard Test Report
                            
(February 15, 2001)
                                                    (Charts recalculated 3/31/01)

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Performance Graphs

DIMENSIONS: Length 36". Width 11". Height folded 15". Weight 40 lbs.

PACKAGING: The unit was quite well protected during shipment by the use of "Instapak" foam bags. No signs of finish scuffing, or shifting of the scooter were noted. The outer container was complete and undamaged.

DOCUMENTATION: Very thorough and easy to understand, with one exception. The inserted battery charging sheet and manual are not in complete agreement as to performance specs. (specifically, distance expected) I assume that you intend to correct any discrepancies in a future updated manual.

QUALITY and DESIGN: Visually, the most impressive features of the Hoverboard are the machined aluminum components. The wheels, front and rear swing arms, and motor mount are well engineered and executed. The drawn aluminum battery pan, doubling as a heat sink for the controller and charger, is beautifully incorporated around the oversized monotube frame member. (1-13/32 tubing) Steel standoffs rise up through the pan, supporting the deck and transferring a portion of the payload directly to the frame. This is a clever design element! All welds appear to be TIG, and quite professional. Frame members, battery pan, and handlebar assembly utilize this weld.

The headset bearings are more than adequate, but were somewhat over-tightened as shipped. With use they would loosen, but the "feel" was not smooth. The "umbrella" like steering tube folding mechanism is quick and positive locking, both in the up and folded position.

The solid rubber 6-1/2" x 2" tires are molded true, and should perform well on paved surfaces with their "slick" style contact surface. However, operating the scooter on wet surfaces could be treacherous.

Heavy plastic cap molding surrounding the battery pan and wooden deck contact area provides an adequate water seal, while allowing easy removal of the deck. Also, I like the use of rubber tubing to guide cables into the battery compartment.

The 7 layer plywood deck (appears to be mahogany veneer) with anti-skid strips is strong and should stand up to considerable abuse. At 10-1/2" x 22", it is nicely sized for this machine. I would, however, take the time to "finish" the routed edges more thoroughly. They are somewhat "rough", and detract from the overall "fit and finish" of the product.

The reflective "wrap" on the steering tube, doubling to secure the brake and throttle cables, is effective. However, (if I remember correctly) there is no rear reflector. Finally, a small plate welded to the ground contact point of the kick stand would improve stability on soft surfaces.

TECHNICAL: Both controller, and charger circuit boards are of high quality with many surface mount components for reliability. They are well protected, and incorporate various quick disconnect style plugs for ease of removal. The heat dissipating elements of both boards are effectively heat sinked to the large aluminum battery pan. Through comparison with an older model charger circuit board, it is clear that a component change has been made to reduce the "finish" voltage applied to the batteries. This change, along with a new recommended charge time, is expected to eliminate the overcharge condition found in some older models.

The new brush-less PWM motor, a Litton model BN34-25AL-04LH with large 15/32" shaft, is quiet and extremely controllable at slow speed. In fact, combined with the well designed electronic controller board and finger operated throttle, I was able to maneuver around the shop at speeds well under 2 mph with total speed control. (something Iíve never been able to do with other scooters) A temperature strip, indicating 86 to 140deg F is attached to the motor body and easily readable. Under full speed testing, the motor case temperature reached 140 degrees in about 10 minutes. Without a higher temperature range strip, I canít report actual motor temperature after the completed tests, but no sign of overheating was observed. It is my understanding that various drive roller diameters will be available, to accommodate specific riding conditions. Drive roller tension is automatically adjusted by the pivoting, spring loaded motor mount.

Four Yausa 6 volt, 10A/hr (estimated) batteries in series provide 24 volts to the motor controller. Although I would prefer to see no more than two batteries in a series hookup, (for battery equalization purposes) occasional voltage checks should provide ample warning of battery deterioration. Replacing the "weak" battery will prevent over or under charging of the remaining three units. After four "break-in" runs, these batteries (at 77 deg F) provided power for a 7.9 mile run with an average speed of 13.1 mph. Top speed during this test was 13.8mph, with a duration of 36+ minutes.

Although I was unable to road test the braking system, the two stage design should prove quite effective. A light squeeze of the lever activates the rear wheel dynamic braking action of the motor , while a further movement engages the front wheel caliper brake.

All testing of this unit was completed in a static test fixture. Test load conditions were set to simulate a flat, paved surface, with the equivalent of a 170 lb rider on board. Tests 1,2, and 3 were conducted with batteries at 50 deg F. Test 4 was conducted with batteries stabilized at 77 deg F.

                                         Performance Graphs

                                 (Click graphs for full view. "Back" button to return)

HB-AvSpd.jpg (21471 bytes) HB-Duration.jpg (20264 bytes) HB-MaxSpd.jpg (20804 bytes)
        Average Speed                      Duration                       Maximum Speed

                    HB-Miles.jpg (18979 bytes) HB-SpeedTime.jpg (36555 bytes)
                                  Mileage                       Speed vs. Time

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