In NovemberAnthony Smith completed the Disintegrator, a shot motorized rubber band gun with 2 barrel counter-rotating rotors. This gun can be mounted on a tripod Rubber Rounds fired from the hip, and can fire more than 40 rounds per second. A rotor with a pre-prepared string spooled around it pulls off rubber bands one-by-one as it is unwound from the rotor and off the barrel. The string is wound around one barrel, then a rubber band placed on that barrel, then the next barrel, and so on until the string can be pulled and the bands fired.
Each barrel has an escapement mechanism on it with a releaser that is pressed once the barrel reaches a certain point. Rubber band guns can be created with many different media balancing ease of construction, reliability, and capacity:. The majority of lasting, reliable rubber band guns are made of machined wood. Among the most popular wooden RBG designers are parabellumwho has developed magazine-fed automatic and select-fire designs, and oggcraftknown for his unique firing mechanisms.
Rubber band guns can be made from Popsicle sticks. The individual sticks are held together by either rubber bands, tape or glue. They can also be cut or carved to the required shape. It is generally limited to pistols and sniper rifles, as only one or two shots can be loaded on most guns, but semi-automatic ice-cream stick guns have been made by determined amateurs. They can also be adapted to fire arrows or other small objects with the rubber bands. In some guns, the handle doubles as a trigger, but having a separate trigger and handle provides much better accuracy.
Rubber band guns can be made using only Popsicle sticks, staples, and rubber bands of various styles and sizes. This specialized technique developed and honed by Rubber Rounds school student Stuart A. Burton  is very malleable and can be utilized to develop very advanced and complicated rubber band guns. For instance, using levers and sliding mechanisms, one can make a pump action shotgun. Using simple geometry and specialized positioning, you can easily make semi-automatic and 2-shot burst fire weapons, as well as more complicated fully automatic weapons using paperclips as an axis for a rotating firing piece.
Occasionally, other materials like bamboo skewers, for instance may be used in the making of the gun. Sights, foregrips and magazines to hold extra rubber bands may also be made according to the owner's preferences. Through creativity and imagination, one can make detachable sights, grips, stocks, silencers, and under-barrel shotguns or grenade launchers.
Rubber band guns can be built from K'Nex. Such constructions can include handheld pistols, automatics and sniper rifles. Here are some of the selling points they came Rubber Rounds with. What's your favorite? Bright red? Why not use a different color in every garden bed? It's stupid and it stinks -- literally. On a hot summer day, it smells like hot tires.
Secondly, colored mulch looks horrible. Thirdly, natural mulch slowly decomposing over time is a GOOD thing. Adding organic matter to the soil loosens it, increases nutrient and water retention, and feeds earthworms and beneficial soil microbes.
Finally, rubber mulch isn't a healthy choice. They are designed to be inherently stable in flight; if disturbed by a gust of wind or a thermal current they will return automatically to stable flight.
Their stability is achieved by a combination of design and trim, - the relationship between centre of gravity, wing and tailplane incidence and rudder setting. Most of them glide at little more than walking pace and few weigh more than grams. Free flight models may be broadly divided into four categories: . When flown competitively, the usual aim is maximum flight duration.
In the case of models flown outdoors, the modeler attempts to launch the model into rising column of air, a thermal. These outdoor free flight models tend to be designed for two very different flying modes: climbing rapidly under power or tow, and gliding slowly Rubber Rounds circling with minimum fall rate.
Much of the challenge in designing and flying these models is to maintain aerodynamic stability in both modes and to make a smooth transition between them. Modern models use mechanical or electronic timers to move control surfaces at preset times.
Detecting the thermal into which to launch is vital and can involve several methods, ranging from radio telemetered temperature and windspeed measurements plotted on a chart recorder to Mylar streamers or soap bubbles to visualize the rising air.
Because competitions normally involve up to seven rounds during the day, each flown to a maximum flight time hard to achieve without thermal assistance; an automatic on-board timeswitch upsets the trim of the aircraft when the "max" is achieved, to bring the aircraft down safely and quickly.
Locating and recovering the aircraft for further flights is an important part of free-flight. Many aircraft carry radio location beacons, and flyers will use GPS, binoculars, a compass and a directionally sensitive radio tracking receiver to assist them.
A day's flying and retrieval may well involve 20 miles 32 km or so on foot or on bike, depending on wind strength.
Models flown indoors do not depend on rising air currents, but they must be designed for maximum flight efficiency, because of the limited energy stored in the rubber or electric power source. Within each category, there are different classes. Within the competition classification codes specified by the FAI, free flight aeromodeling gets the generic code of F1where the "F" stands for flying model aircraft in general, with the "1" standing specifically for free flight models.
Gliders have no onboard motive power. The only energy inputs are the launch, and rising air encountered during the flight. The model must have a projected area wing and stabilizer of between dm 2and a minimum weight of g.
Launch is by hand tow, using a tow line of 50 m length, similar to towing a kite. During the tow phase, the glider can be controlled by letting it glide in tight circles followed by towing it up against the wind.
Once the decision is taken to launch the model, the sportsman runs to make the model gain speed. When the model is at maximum speed overhead, the tow line is released and a mechanism frees the tow line from the model which then starts a pre-programmed pattern to convert speed into altitude. Modern F1A gliders can gain sometimes as much as 70 meters of additional altitude. Open glider contests are rarely flown, and most competitors in such contests use F1A gliders. Other glider classes include magnet-steered F1E Rubber Rounds - essentially a free flight slope Rubber Rounds class, and hand-launched glider usually abbreviated HLG, and also widely known as simply chuck glider.
HLGs are small models which are launched from level ground simply by being thrown hard. This is one of the more athletic of the free flight disciplines. Rubber-powered models are powered by the stored energy of a twisted elastic material. These range from the simple rubber-band powered toys available in many toy stores, up to the open rubber class, examples of which often use g of rubber in their "motor".
Rubber does not produce a constant power output; when fully wound a rubber motor produces its maximum torque, but this drops rapidly at first before 'plateauing', finally declining again, after which the propeller stops. Using this initial burst efficiently is vital, and automatic variable-pitch propellers help here, together with timer-operated changes of wing and tailplane incidence and of rudder setting.
At the end of the power run the blades fold back alongside the fuselage to minimise drag during the glide. Charles Dennis Rushing has written on the history of the Wakefield Cup.
The maximum total area of the model must be less than 19 dm 2. The mini rubber class is Coupe d'Hiver also known as F1G.
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