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<h2>Build a hovercraft!<h2>
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Everything you need is provided in this kit(except scissors).
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<img SRC="all-pieces" BORDER=0 height=240 width=320>
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<br>You should have: a plastic duct, a battery holder with switch, a motor and propeller, a foam tray, four flat foam pieces, a pair of black and white velcro pieces, four small round stickers, a transparent sticker with the words "motor cover", a piece of netting, 25 brass fasteners, a length of foam tape, and a length of string.
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Your hovercraft works likes this: A motor and propeller send air through a plastic duct into the airbox. The airbox sends half of the air underneath the craft, and half of the air out the back. The air sent underneath the craft forms a cushion of air between the craft and any flat surface, and the craft sits on top of this cushion of air. The air sent out the back provides thrust and sends the craft forward. As the air is sent out the back, it flows past the rudders. The rudders straighten the flow of the air to help the craft go straight.<br>
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Look at the four flat foam pieces. Much of it consists of the airbox.
The airbox is made of three parts: a roof, three walls, and a floor with a trapdoor. For now, just familarize yourself with the names. You'll see how it all works as you put your craft together. <br>
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1)Lay out the four flat foam pieces with their creases facing you. For each of the pieces, fold along each of the creases. Fold each crease in both directions -- first toward you, and then away from you. Use a table or desk to brace each piece and then fold with both hands. Fold each crease as far as it will go - it is ok if you hear a cracking noise! Check carefully -- it is easy to forget a crease or two.
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<img SRC="folding-baseplate2.jpg" BORDER=0 height=240 width=320>
<img SRC="foldingairbox1" BORDER=0 height=240 width=320>
<img SRC="foldingcabinsides1" BORDER=0 height=240 width=320>
<img SRC="foldingcabintop1" BORDER=0 height=240 width=320>
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<img SRC="airbox16.JPG" BORDER=0 height=240 width=320 align=right> 2) Now we'll make the airbox. Lay out the airbox walls and the airbox floor as shown. The airbox floor has a small dimpled impression in it -- have it face up. The airbox walls have three flaps at the bottom. Fold the middle flap toward you and fold the left and right flaps away from you, as shown on the right.
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Now connect the walls and the floor using four brass fasteners as shown below. Be sure to tuck in the middle flap against the part of the floor without any holes. <br><br>
<img SRC="airbox1111" BORDER=0 height=240 width=320>
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3) Attach the airbox tightly to the foam tray. Use the four holes surrounding the rectangular opening. Be sure the brass fasteners lay as flat as possible against the bottom of the hull.<br>
<img SRC="airboxontohull1" BORDER=0 height=240 width=320>
<img SRC="airboxontohull2" BORDER=0 height=240 width=320>
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4) Put on the airbox roof and rudders. First lay out the roof and rudders as pictured, with the rudders pointed away from the foam tray. Place brass fasteners in the holes on the left and right sides of the roof, and then attach the roof to the airbox's flaps. Attach the fasteners tightly.
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<img SRC="newrudder1" BORDER=0 height=240 width=320>
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5)Fold and attach the rudders. First attach each rudder to the roof, and then attach the bottom of each rudder to the floor (and foam tray). Be sure to attach all brass fasteners as tightly as possible.<br>
<img SRC="rudder3" BORDER=0 height=240 width=320>
<img SRC="rudder4" BORDER=0 height=240 width=320>
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6)Turn the craft over and open the trapdoor. Open the trapdoor all the way. When you push the trapdoor past the two flaps near the roof, the trapdoor will click into its fully open position. When the trapdoor is fully open, it will press against the rudders, as shown in the second picture. If necessary, realign the brass fasteners so that they do not get in the way of the trapdoor.<br>
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7)The cabin is just for decoration. To attach it, first use one brasss fastener to attach the front flap to the foam tray, and then fold the cabin over and attach the sides. Be sure that the brass fasteners lay as flat as possibly against the bottom of the foam tray. <br>
<img SRC="cabin1" BORDER=0 height=240 width=320>
<img SRC="cabin2.jpg" BORDER=0 height=240 width=320>
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8) Now we're ready to set up the motor.
To keep the insides of the motor nice and clean, cover the six holes in the motor with stickers. Use the white round stickers to cover the two holes in front and the two holes in back, and use the "motor cover" transparent sticker to cover the two slots along the side of the motor. This is an important step - your motor won't last long with unsealed holes.<br>
<img SRC="motorsticker1" BORDER=0 height=240 width=320>
<img SRC="motorsticker2" BORDER=0 height=240 width=320>
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9) Next, put the motor into the plastic duct. It is a tight fit! It may help if you approach the plastic duct on a slight angle. If that doesn't work, you can also slightly move one of the pieces of plastic which holds the motor in place. Be sure to line up the little metal tabs on the motor with holes in the motor duct. <br>
<img SRC="motorinsert1" BORDER=0 height=240 width=320>
<img SRC="motorinsertnew3" BORDER=0 height=240 width=320>
<img SRC="motorinsert4" BORDER=0 height=240 width=320 align=left> <br>After you have placed the motor into the duct, spin the propeller. If the propeller hits the walls of the duct, check if the motor is fully inside the duct. If it is still hitting, adjust the four pieces of plastic holding the motor in place so that they are staight.<br>
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10) Hook up the motor to the battery holder. There are two ways to do it. The simple way is shown here. You'll see a more fancy way to do it on the next slide. In either case, the little metal clips at the end of the wires slide onto the motor's metal tabs. You may need to practice this a few times, but once you get it, it is easy. Attach the black wire to the side of the motor which has the slots sealed by the transparent "motor cover" sticker).
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11) And here is a more fancy way. One of the arms of the plastic duct is thicker and contains a channel for hiding the wires. Thread the wires over the curved wall of the duct and to the right of the thick arm of the duct. Pull the wires up throug the middle hole in duct, and then press the wires into the channel as shown.<br>
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12) Use the flaps on either side of the airbox to attach the plastic duct.
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<br> Use three brass fasteners for permanent use, or just use just the left and right fasteners for temporary experiments. The duct's thick arm should be pointed down. .<br>
<img SRC="ductonairbox4" BORDER=0 height=240 width=320>
<img SRC="ductonairbox5" BORDER=0 height=240 width=320>
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13) The battery holder is held in place with velcro. On the battery holder, place the velcro on the side that does not have the switch. On the tray, cover the first part of the word "free" in "CFC Free". <BR>
<img SRC="velcro1" BORDER=0 height=240 width=320>
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14) We're almost done, but before we go hover, lets give the craft a few finishing touches.
First of all, the hovercraft will probably bump into things, so it needs a bumper to protect its sides. Use the foam tape. Start at the rear of the craft, and attach the tape all the way around. There will be two or three inches of tape left over.<br>
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15) When the hovercraft bumps into something, sometimes the battery holder slides open. That extra length of foam tape from the last step can fix that problem. Place it ahead of the cabin's middle rivets, as in the picture, so that it holds the battery holder in place.<br>
<img src="foambatterytape" BORDER=0 height=240 width=320>
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16) The propeller spins very fast and if it hits anyone's finger, it will hurt. Cover the propeller with a guard. Use the white netting and eight brass fasteners. Pull the white netting tight, but not so tight that it bends the plastic duct. Trim with scissors. You'll have lots of netting left over.
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17) You can use the red white and blue stripes to decorate your craft, or use your own stickers and markers. And finally, you can put a leash on the craft, so you can walk it like a dog. Don't skip this step - the string makes the hovercraft twice as much fun. Use a brass fastener to attach a string just in front of where you placed the battery and the extra length of foam tape. Be sure to line up the brass fastener with the center of the craft, and be sure to fasten it tightly to the hull. You can store the string at the front of the cabin when you want the hovercraft to fly free. Happy hovering!<br>
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