neptronix wrote:is this a joke?
Not joking at all.
You are not going to ever have a hoverboard that looks anything like the science fiction models shown in the movies, but personal hovercraft type hoverboard models have been around for awhile.
The two working hovercraft type hoverboards on the market today both use gas powered engines. However, the "Airboard" from Arbortech is the only serious hovercraft type hoverboard on the market right now: http://www.arbortech.com.au/view/airboard/
Here are the specs from the site:
Easy to Ride
The Airboard has an electric start. Simply start it up, hop on board, adjust the throttle and away you go. By using varying degrees of weight transfer, the Airboard can be made to respond in different ways - sharp or slow turns, 360Âº turns and sliding turns are all possible. As your skills increase so does the range of exciting manoeuvres you can perform.
The Airboard accelerates quickly to a top speed of 25 kph (15 mph).
Easy to Control
There are two levers on the handle bar - One for lift (engine speed) and one for thrust. By leaning back a small thrust wheel at the rear of the vehicle can be brought into contact with the ground to assist acceleration. When flying the rider simply leans to the left to turn to the left, leans to the right to turn to the right. Stopping is attained by either a sharp turn or letting go of the controls.
Easy to Maintain
The four stroke petrol engine is manufacture by one of the world's largest manufacturers and needs only periodic maintenance. All wearing components, such as filters and friction pads, are easily serviced by the user.
The Airboard can be used any firm reasonably level surface such as mown grass, asphalt, pavement etc., or any packed dense surface that is free of stones and litter. The Airboard is not suitable for use on water!
Ideal for beginners & skilled riders (OVER 14 YEARS OF AGE)
Diameter:___________________________1650 mm (5 ft 4ins)
Height incl.handle:___________________1200 mm (4 ft 0 ins)
Deck height:_________________________300 mm (1ft 0 ins)
Weight approximately :________________70kg (152 lb) Control & Performance
Top speed:___________________________25km/h (15mph) subject to conditions
Braking:_____________________________Brake lever- cuts throttle and expels air
Hand Controls:_______________________Brake, clutch
Lift Controls:________________________Throttle lever
Emergency Cut-off:__________________safety lanyard to engine kill switch
Maximum obstacle height:____________40mm (1-1/2 ins)
Stopping distance approximately:_____6m at 25km/h
Operating Surfaces:_________________Firm mowed grass, hard asphalt, concrete General:
Total payload, incl. rider:____________120kg (260Ib)
Operating time:____________________1.5 hours on full tank of fuel
Construction:______________________Roto-moulded Metallocine LDPE square tubular chassis
Finish colour:______________________Variable- most primary colours
Starting:__________________________Electric key-start, Battery included
Engine:___________________________Briggs & Stratton 4-stroke
Fuel tank capacity:_________________5 litre (1.3 US gal)
Fuel type:_________________________Use clean, lead-free gasoline with a minimum of 85 Octane
Approx. shipping weight:___________150kg (330 lb) incl. shipping package
Approx. shipping package size 740mm H x 1800mm W x 1800mm L (30 ins H x 6 ft W x 6ft L)
The Airboard is a pretty good model. It has made a lot of advances as a pioneer of the field and it's leaps and bounds ahead of the competitors.
Still, it does have some weaknesses in noise levels, limited control, and limited areas of use.http://www.youtube.com/watch?v=P_-PQdrgw2A&feature=fvwrel
The other board is the "hoverboard" from Future Horizons. It seems to be the only actually functioning item on the site. Although incredibly loud and funky looking, it is lighter than the airboard. http://www.futurehorizons.net/hoverboard.htm
For hovercrafts this small, efficiency is the primary factor. Basically governed by fan efficiency, skirt performance which could also be called air leakage, fuel levels or battery operating time, and weight.
One of the things I have been working on is a drastically different kind of skirt design that could majorly reduce air leakage, and would also work best on the small platform size of a hoverboard. This could reduce the fuel usage, required motor power, weight, and cost of the board. I have also been looking into calculating the ideal fan type for this application with the best resource by far being the Fan Handbook: Selection, application, and design
by Frank P. Bleier.
A centrifugal fan may not be the ideal fan choice for this application. In addition to the high level of static pressure that is needed to lift a board this size, there is also the system resistance which can act the same as static pressure, and "turbulent" air flow which is also a key factor of major losses of efficiency in high air volume fans. Two stage axial fans have a unique design that can actually mostly counteract turbulent air flow without guiding vanes and withstand static pressure ranges of 4WC to 18WC compared to 0-1 for propeller fans, 1-2 for tubeaxial fans, and 1-9 for single stage vaneaxial fans. If a two-stage axial fan was combined with a S-tipped airfoil fan blade, than this fan could have a high performance at the ideal static pressure ranges of the hoverboard with a large reduction in the noise levels due to the S-shaped blade.
My current design would use electric motors and LiPo batteries (possibly A123) with a battery life of about 1 to 1.5 hours. This calculation is based on the "Hovercraft lift calculator" from HoverHawk.com http://www.hoverhawk.com/lcalc.html
My design is much more in line with the model made by Eddie EdwardÃ¢â‚¬â„¢s shown below.http://www.designnews.com/article/12790-Eddie_s_Big_Challenge_Ground_Effect_Turbulence.php
Here are the design notes for Eddie's "Hovaboard"Hovaboard Ã¢â‚¬â€œ Construction Guide
Attach the spacer boards to the top board; this will form a plenum chamber.
The fan, motor controller and batteries are mounted to the bottom board, so that the fan system can be wired up and tested before assembly.
Once the fan system is tested the top board and bottom board can be brought together to form the hovercraft plenum chamber.
The segmented skirt attaches between the top and bottom board, to channel the air from the chamber under the board. And there you have it, as simple as that!!!???
It is a good idea to build an in emergency cut-out to the motor controller to stop the fan if the rider falls off the board.Hovaboard Ã¢â‚¬â€œ Parts List
1 x Top board Aluminium honeycomb composite
1 x Base board Aluminium honeycomb composite
4 x Spacer boards Aluminium honeycomb composite
1 x Centrifugal fan Ã¢â‚¬â€œ Similar to -
Mfr.'s Part #:
Allied Stock #:
Backward Curve AC Impeller CFM710
1 x 48V power system (Lithium Ion)
1 x Motor controller
1 x Segmented hovercraft skirt (rubberised nylon)
Assorted nuts, bolts, cables and connectors.