Does anyone know how to build a catapult? I cannot find any good websites to give me the instructions.?
960148
check this site out. it is not a true catapult but a trebuche.\nkind of the same thing but better. \nhttp://www.ripcord.ws/plans/plans.html
221571
Very Nobel interest. If you can build it then let me know. Here are the tips from me. Use FM band to for the controls, if you can have a digital control system then you can operate that with a high and low pulse from the ground. And if its a toy plane then there shouldn't be more then 3 or 4 controls which should be easier to design. contact me let me know the further update on your this project and any assistance.
196712
http://builder.com.com/5100-6373_14-5109284.html has a\nmini tutorial on it for you
201530
Attach a falcon to the prototype.. Think it will fly high! :-)
570010
Hi there,\n\nHere are some great websites that explain the entire process:\n\nhttp://www.rcskim.com/makeaboard/How%20to%20build%20a%20skimboard.html\n\nhttp://www.skimonline.com/equipment/board_building.htm\n\nhttp://www.surfing-waves.com/howto/make_skimboard.htm
11475
Well it is pretty easy to build a simple motor. There are instructions at this website.
151949
What is it?\nA trebuchet is a war machine capable of launching large objects long distances using a very simple counter weight system. Many people equate a catapult with a trebuchet but in reality the two machines are extremely different in how they operate as well in the end result they produce. A catapult uses tension to launch its payload. A trebuchet uses a counterweight to produce torque across a fulcrum in order to 'sling' its projectiles. During the middle ages a trebuchet would have been considered high tech and was used to take down an enemy's castle. In the picture above, the trebuchet can launch a bowling ball several hundred feet.\n\nFirst link is best:
386704
Go online and look up longbow or if you really feel up to it, fly to Wales, England and find armories that still produce said weapon for Archery clubs.Since the Welsh first used them in combat against the English during the 11th century hey still have a few people who actually make them by hand.It's a dying art and very,very very expensive.\nHave fun.
936096
My daughter had to build a catapult for her geometry class.  We used PVC pipe and large rubber bands (for tension).   It's pretty inexpensive and was easy to put together.  By the way, her catapult shot much further than the elaborate ones that kids brought in.  I think it shot a tennis ball about 70 feet.
238578
First, look at the metal frames holding it up.  They look like metal pipes running vertically from the ground and horizontally along the fence.  There should be a horizontal one at the top of the fence, and sometimes (especially for a fence that high) there is one running through the middle.  Find a section of fence with the most horizontal support frames as they hold the fence in one position, making it easier to climb, and if you are on the side where the beams are, then you can use them as footholds.  \n\nI'm assuming there is no barbed or razor wire on top. Once you found your spot to climb, reach up and take a handhold, then another (do not jump and grab unless you are an accomplished urban climber), then raise a leg to about waist height, and depending on the size of the holes in the fence, either put the toes in through the one of the holes (large holes) or the bottom of the foot braced against the fence in the most stable area of fence you can reach (small holes).  One foot should still be on the ground.  Now, pull up, using your lower body strength as much as possilbe, and grab one handhold higher up and raise the other leg into a foothold.  \n\nNow that all four limbs are on the fence, make sure they are not all tightly together.  This rapidly fatigues the muscles.  In fact, you should spread out as wide as possible while climbing the fence as this offers stability and effeciency.  Whenever you reach for a hold with one limb, the other three should be stable and securely grasping the fence.  Grabbing two holds at a time is not only ineffecient but potentially dangerous.  You could fall, and we don't want that.  \n\nOnce you've reached the top of the fence, your hands should gasp the top horizontal support pipe, no matter which side you're on.  If there is no such beam, you're in a for wild ride as your shifting weight will make the fence sway to and fro dramitically.  Holding tighly with your hands, release one foothold and pull your torso above the top of the fence.  Swing your dominant leg over to the other side, turning your entire body.  This is your most unstable moment, so be extra cautious here.  Release your other foothold and swing it over the fence as well to join your dominant leg as it now looks for a foothold.\n\nYou are now at the top of the other side of the fence.  You can either jump down or climb down.  I would reccomend climbing down using the same principles used to climb up unless you are in a hurry.  \n\nDepending on your skill at urban climbing and upper body strength, you will be able to do this a lot quicker than it took to read.  It's cool to see someone interested in urban climbing.  Have fun!
334998
catapult or trebuchet
1166603
I'm not sure what you're asking here but I'm guessing you're looking for ideas as to what to build?  If that is so, someone needs to invent a better type of ramp or hoist to load motorcycles onto the back of pick-up trucks.  All the old guys who can afford motorcycles nowadays, are having a really tough time finding a spot to load their bikes.  A heavy bike is kind of scary to drive up a ramp....something better is needed now!  If you invented one that worked, I would buy it!  If you contact me, leave your email as many are unvalidated with Yahoo and I can't respond.
416611
First, drill a tiny hole in the ground...No, four holes, each about two or three feet from each other. Then stick in four 1-foot tall pegs into each hole, one peg in each hole. Heres the hard part. Drill one more hole one centimeter away from each peg, stick in another metal rod (really thin), and then bend it till it touches first, thicker, taller peg, then weld. Add a very strong metal upside-down T beam onto the pegs, cut off excess (the ones that extend farther than the peg's location), then weld to the large pegs. There! Phew, that took a while. Hope it helped. Also, take note that this advice only works when you start from scratch.
1169077
It'd be easy to just say, throw the darn dart!  I'm hoping you want the rules to Darts.\n\nIf so, try the link in my Source list.\n\nGood luck, and have fun, and be safe!
805418
Here's a site with alot of different ideas and difficulty levels with instructions.  Maybe you can find something here.\n\nOr you can tell us more about what you are wanting to do and what you like and we might be more helpful on here.\n\nhttp://www.all-science-fair-projects.com/
391825
i believe you might find these 2 links useful, http://www.sunward1.com/woodkits.htm and http://www.redstoneprojects.com/trebuchetstore/build_a_catapult.html
8294
I wondered about this a few years ago...found the solution online.  Very cool engineering trick.  I rememebered where I found the solution.  The cranes grow themselves.  Check out the link below...with pictures.