there is not a category for my instructable!? Answered

i am doing a instructable  with golf balls but there isn't a category for golf balls or sports or anything like that. i was thinking it was probably something like life hacks but i have no idea. help please?

Question by chessman908   |  last reply


How can I make a durable outdoor mini golf course?

I have a low budget and a lot of extra cement. I'm just wondering what other materials I would need other than putters and balls.

Question by Jeremia was a bullfrog   |  last reply



New Sport!! Combine Golf with Archery!

I have an idea for a new sport. If you combine golf with archery, you'd get Golfery! The concept is simple with only some minor modifications. Arrowheads now have a golf ball or ping-pong ball for a head. To get a hole in one, the player must hit the flagpole in the pocket. There are (3) 1 foot wide rings concentrically spaced around the flagpole. Inner ring = 1 stroke, middle = 2 strokes, outer = 3 strokes. If the arrow lands outside of the outer ring, the player must pick up the arrow and gently toss it underhand towards the pocket. Other than that, the standard rules of golf are followed. I don't have the equipment to test out my ideas. If someone here would try it out and PM me with the results and any suggestions that would be great.

Topic by javajunkie1976   |  last reply


How fast can you spin your Golf Ball?

I played around with some balls placed into the airstream of a little blower. Everything light enough just "danced" in the air like being hold on invisible strings. But not so much the golf ball! You would expect those dimples are good for reducing air friction but do they also offer stability in some cases by making the ball spin? Check this video I recorded while playing - to me it looks like with a proper nozzle there is even more speed possible. https://www.youtube.com/watch?v=014QkXuTL0o How fast can you make it spin?

Topic by Downunder35m   |  last reply


how do you build a golf ball trebuchet?

For school i have to make a trebuchet that can shoot a golf bal as far as it possibly can but i don't know how to make it and i can not find any plans that are descriptive enough.

Question by    |  last reply


Does anyone know the exact weight of a golf ball? Answered

I an working on a science project and dont have a scale to calculate the weight of a goflf ball. Please help its due Tomorrow!!!!

Question by west49rules   |  last reply


Golf ball launcher/ spud rifle long range

A golf ball will traver about 3X farther than a smoth round object .  This brings a spud/rifle to a whole new level.. Golf balls now come with 350 to 450 dimples to disrupt the lamar flow and decrease drag.  The ?? test guys did this to a car and got 10% better gas-milage on their first try.  I've thought about this for a longtime now .., I need some help tho,.or I wont ever get to It.  There is a recient article here on a hi power or long range spud rifle that looked good for a launcher, but it mite now be strong enuf for a 45 grain ball? Some ball did come with just a band of dimples so the ball would stabllise in flight and not climb or divert from the spin all golf clubs have built into their faces 7degrees?  I believe they were outlawed since they would be more accurate on drives.  It mite be good for this launcher tho?   Thanx 

Topic by jonpersonals   |  last reply


Cheese fritters like golf balls, spherical? Answered

Mother used to make them from flour dough with grated cheese. They came out beautifully crisp on the outside and chewy inside. She would just spoon the dough into hot oil and Voila ! Don't have the recipe. Please help.

Question by hit_dSpot   |  last reply


Slope Measuring

     I'm interested in making a yardage book for one of the golf courses i play at. The only problem is that i don't know an accurate way to measure the change in distance through elevation. For instance if a shot to a green with no change in elevation requires a 7-iron, then a shot of the same distance that is downhill should require a club that will hit the ball a shorter distance.       My question is, is there a formula of some type that i can enter the rate of change in slope and the distance, and get the actual distance needed for the shot.

Topic by wenpherd   |  last reply


Quantum Minigolf

Hi!http://www.quantum-minigolf.org/Remember I was talking about how it is to play golf in the quantum world during the show and tell at squid labs? For a popular science presentation, my friend Friedemann came up with the idea of implementing a simulation of quantum minigolf: virtual quantum minigolf by tracking a real golf club and projecting the golf ball on the ground. Credits for the original ideas and for the excellent realization go to him!Best wishes, Matthias

Topic by mgoerner 


Can i use a grill igniter to light Black powder

I am building a golf ball morter and I don't want to use fuse could I use a grill igniter?

Topic by Boomstick3402   |  last reply


Multiple Ideas / Scholarship Submissions

My first two ideas pertain to the realm of sports. Luckily enough I have a city park for a backyard that is big enough for me to hit my low golfing irons. The only problem is having to chase after the balls myself thus consuming valuable time and energy. My proposal is to alter the irobot to retrieve the balls for me in one of two methods. Additionally I would also like to enable to robot to possibly record the location of where it retrieves the ball to help in my swing analysis method 1: Add a mechanical arm, cage and rake system a la the golf cart guy at your local range by sending the robot out on pre-programmed sweeping patterns. method 2: develop some sort of mechanical arm that can retrieve individual balls by locating them with an ir detector as the white of the ball contrasts with the green of the grass. This could also be modified by loading the golf balls with RIF chips and having the robot detect this symbol. The second idea is to turn the robot into a living assistant for my grandmother. Some of the various functions that I would look to add include some sort of panic button, or emergency button especially as it pertains to her falling down and being unable to get up, others functions would include picking things up off the floor as she has troubles bending, and assisting in the transportation of groceries and other items through the use of either hamper like structures attached to the robot or a coat tree like structure. Additionally I would program the robot to take advantage of pre-existing sensors so that it could follow my grandmother wherever she went and possibly provide a better platform for her cell phone as she never hears it and complains about carrying it and possibly add some pda like features.

Topic by bigtheo23 


Water Tunnel Testing (photos)

I'm starting a new topic so I can edit it later with more content.I went with some friends to a different lab section that was also playing with the tunnel (my official turn is on Friday).Things put in:1. PVC tube -- to show detachment of a cylinder2. Golf Ball -- to show how dimples create turbulence and keep flow attached longer3. Tennis Ball -- to show how fuzz acts almost like golf ball dimples4. Porsche 9115. Atlantis Space Shuttle6. Porsche 911-turbo (or possibly a 935 or 993 -- can't remember)7. Chain Mail Cube -- wtf? why did someone make that?8. Surf Board Fin9. Optimus Prime10. Unknown Porsche (I just can't remember what it was)11. Batting Cage BallThe pump was set to 3.55 inches per second. So for a 1/64 scale model (for the cars) - that's just under 13mph equivalence (in water).My camera had a low battery -- so the shutter was slower than normal. I'll get fresh batteries and a tripod on Friday I'll have some better pictures (hopefully).As for what I'm bringing in... Still don't know -- but I think I am going to do a comparison of apples and oranges :PVideos of the 911, 911turbo, unknown porsche and of the overall tunnel in operation ;)Update November 3rdItems Tested:1. Plastic Cone (with hole in top)2. Apple3. Eyeglass Case4. Obligatory Altoids Tin5. Plastic Water Bottle6. Highlighter Cap7. Reverse Gear from a manual gearbox (Nissan)8. Pen Cap thing9. Rubber Duck10. Nerf Dart (velcro top)11. Batman Shield (this was really cool)12. Welded Plate13. Golf Ball14. Guitar Bar15. Wing FoilAgain, it was set to 3.55 inches per second. I couldn't find an orange on campus (weird considering I'm in central Florida :P). So I'd say an orange is kinda like a golf ball :PThe Bat Shield video is very cool - if you watch just one of them, make it the bat shield ;)

Topic by trebuchet03   |  last reply


Ball counter or weight sensor with relay to sound alarm or trigger 9v confetti cannon

Anyone interested in a bit of work...I could also run it as a competition. Apologies in advance if what I am doing in not allowed on instructables, but I couldn't find a place to offer this work. Peoplehour does not specialise in tech gadgets! I am a one man band training business in the UK. I am trying to find someone to make this gadget to work with my Gravity Ball Game. Gravity Ball is a two hour team building activity. Gravity Ball requires teams to design and build a construction capable of transporting a ball from one zone to another; the ball must roll freely along the construction using gravity only. There will be a shared zone that will require team collaboration, co­operation and coordination. Everyone needs to contribute to the overall team objective whilst ensuring their own structure functions to a specific brief and works correctly. All teams will release their designated ball (tennis ball, golf ball, cricket ball, squash ball. Etc.) at the same time. Each team ball will roll freely along the team structure, into the shared area and the fall into a collection container. When all the balls are in the container (and a specific weight achieved) then the Weight sensitive relay switch will detonate a electronic confetti cannon. Alternatively, an infra red or sensor can count the number of balls that pass at a particular point and when the designated number is reached, the confetti cannon will detonate The detonation will give a wow factor to the team activity. Considerations: I need a gadget, Arduino, raspberry pi or beaglebone that can measure or count the number of ball and then detonate a confetti cannon or sound an alarm • Programmable weight or ball counter setting • Maximum weight 300g-400g or Maximum number of passing balls is 10 • Work with standard electronic confetti cannon from Confetti Masters, alarm or Siren (http://www.confettimaster.com/streamer.electric.confetti.cannons.html) or Showtec electric cannons (http://www.sblite.co.uk/598-80cm-multicolour-electric-confetti-cannon.html) Message me if you are interested! Kind regards Canute

Topic by GreenflashUK 


Controlling a DC motor to only do one rotation and to be triggered using limit switch.

Hi, I'm designing a mini golf hole for a festival in 3 weeks. The idea is to putt the ball in one hole and another ball to be released on another hole. I'm going to use a limit switch to as the trigger signal, but not sure how to get only one rotation on a dc motor and then to reset the trigger. I have to run the whole circuit off 12v battery's. Any and all help would be greatly appreciated. Thanks!

Topic by cmc graphics   |  last reply


My dad has a bump on the back of his neck

My dad has a HUGE bump on the back of his neck, at first i thought it was a zit but after about a year its grown to the size of a golf ball...i've told him to go to the doctors, but he refuses to go...i dont know what to do, and i worried about him...what should i do.?

Question by dannielleeee   |  last reply


Ipod/ Ipod Touch Games

List your best, paid Ipod Touch games here! (I have A lot) Mine are: Super Monkey Ball Supermonkey ball 2 Jellycar Jellycar2 Tap Tap Revenge (1,2,and 3. Riddim Ribbon Rolando Rolando 2 Streetball Lightbike Shrek Karting IShoot Cooking Mama Monopoly: World Edition Madden 2010 Top Gun Let's Golf The Sims 3, World Adventures 2XL Supercross Peggle Angry Birds Pocket God Bloons TD MX Mayhem Monster Trucks Nitro Wheel of Fortune Topple Topple 2 Pac Man Remix Paper Toss World Tour Moron Test

Topic by sammychow4   |  last reply


(newsletter) Toddler Guitar Hero, Homemade Pizza Recipes, Printer Shredder

Toddler Guitar Hero Controller Homemade Pizza Recipes Printer Shredder Dystopic Lamp Easy Compression Bookshelf Glass Beads from Broken Bottles Money Origami Collapsible Bed Frame Wristband Light Writer Ball Bearing Rollercoaster Handmade Rings Position Sensitive MIDI Drum Pad Birch and Aluminum Desk Waterproof Camera Case DIY Disc Golf Target

Topic by fungus amungus 


how can i become as good as possible in basball whithin a week?

I know the basic rules, and we'll play by hitting the ball off a tee (like in golf just much higher). It's for a sportsday of the whole college. Any class attends in two disciplines in a tournament against all ther classes and the teachers team. This year it's football and baseball. (last year was basketball and swimming, extremely funny). Now i'm pretty bad at the moment and i'm in my final year, so i don't want to be the jackass who screws up for the seniors :P I'm a pretty good runner on short distances and the field won't be huge (good advantage), but i'll need to hit the ball far enough to run, that is my major problem. (already read a tutorial from this side, but it wasn't that helpful), so i'm very glad for any tricks, ideas, instructions or whatever. thanks in advantage, oliver from switzerland (yes, the guys with the evil tax-stealing banks XD)

Question by    |  last reply


is this a real meteorite?

I found this out in the desert on one of my visits to arizona from vegas. I found this rock during thanksgiving weekend where my dad and I park at his little ranch which is very clean, no rocks at all. we spent the night at kingman for thanksgiving and on our way back to vegas we stop at our little ranch to drop some stuff off when we park I got out and found this rock in a small crater in the dirt. obviously to my surprise I think its a space rock. its heavy for its size and a little larger than a golf ball you'll see the picture. so yeah theres my back ground story of it so let me know what it is. thanks!

Question by capt. caveman   |  last reply


Barbie Electric Chair, Chaos Machine, Build a Pizza Oven...

Function clickclear(thisfield, defaulttext) {if (thisfield.value == defaulttext) {thisfield.value = "";}}Sign-up for our newsletter subscribe Sept. 6, 2007 Welcome back! We're seeing a few of the robots coming in from the iRobot Challenge this week as well as a variety of other cool projects. Check them out! How to Weld - MIG Welding A basic guide to the awesome process of using electricity to melt and join pieces of metal together.posted by noahw on Sep 5, 2007 PosterBot: Make a Marker-Writing Robot I always got marked down for posters that weren't "neat" enough. Like any nerd, I figured "If I can't do it, I'll make a robot to do it for me."posted by W_world on Sep 5, 2007 How to make Gingerbread Pumpkin Whoopie Pies Make a treat kids love in under 20 minutes.posted by DMR301 on Sep 5, 2007 Put an iPod Nike+ sensor in any running shoe in one minute for 5 cents Avoid buying specialized Nike+ shoes with this simple hack.posted by fungus amungus on Sep 4, 2007 How to build a Pizza Oven Create a functional piece of art for your backyard and start cooking.posted by t.rohner on Sep 2, 2007 Share your tasty recipe with us! Answer our burning questions! Get a free shirt! Make it fly! Barbie Doll Electric Chair Science Fair Project! This is a science fair project that I did in middle school and completely disgusted the entire female staff of Benton Middle.posted by jessyratfink on Sep 2, 2007 The Chaos Machine (Double Pendulum) Every physics department needs a double pendulum, so here's how to build one. posted by Luke Luck on Aug 31, 2007 Baby Space Invader Hat Let your little one go retro with this gaming-inspired knitting pattern.posted by tracy_the_astonishing on Sep 5, 2007 Golf Ball Gun!!! How To Make One That Can Shoot 400+ yards! Learn about pistons and pneumatics while firing golf balls through plywood.posted by MrCrowley on Sep 2, 2007 ServerBot - for serving food and drinks Create a robot that's helpful, entertaining, whimsical AND simply amazing. posted by JoeCreate on Aug 31, 2007 Now go build something awesome, and I'll see you next week! -Eric )))

Topic by lebowski 


Launch It! Challenge Results!

Instructables is happy to announce the winners for the Launch It! Challenge. We saw some amazing entries that showed creativity and power. Once again, you showed us that there are people making cool things all around the world. These Instructables should serve as inspiration for others for a long time.Stay safe, everyone.Ratings Prize: FirstThe Instructable with the highest rating will receive a gift certificate for a Instructables Robot t-shirt from the Instructables store, and a custom-engraved Leatherman. Launch It: Patriot Model Rocket by kruser495Ratings Prize: Runners-UpThe 5 Instructables with the next-highest rating will each receive a gift certificate for a Instructables Robot t-shirt from the Instructables store. Golf Ball Gun!!! How To Make One That Can Shoot 400+ yards! by MrCrowley 25MM Pneumatic Sniper Rifle by irwinner Piano-wire Slingshot by chluaid Colossal Cannon: Building a behemoth piston-valved pneumatic by DeusXMachina The EasySling by -insertnamehere-Page Views Prize:The Instructable with the greatest number of pageviews will receive a gift certificate for a Instructables Robot t-shirt from the Instructables store, and a custom-engraved Leatherman. How to Make Fireworks by pudi.dkRandom Prize:We randomly picked one Instructable to receive a gift certificate for a Instructables Robot t-shirt from the Instructables store, and a custom-engraved Leatherman.Watch the video to see the winner: OK, here it is: Pencil Crossbow by marc92

Topic by fungus amungus   |  last reply


My grandparents found a rock at the beach that spontaneously combusted. what is it? Answered

My grandparents were out walking the dog before sunrise, and noticed an odd rock which felt warm, they left it, it was sitting at the shore line, not fizzling or bubbling, it was low tide,so it must have been submerged at one point within the last 4 hours. Later on their way back, the sun had rose and the rock was now fizzling , when they touched it with their sandal, it burst like a waterballoon of petrol and created a bright thick fire like an oil fire, as if the golf ball sized stone was filled with super heated napalm. My grandparents kicked the small stone which had not melted, into the water and it made a huge explosion which intensified the flames, as if it were sodium. My grandppa kept the stone after it had been burning in the shores wash line for an hour, and took it home. when he got home, he put it into a glass of water and it violently fizzled and sustained a flame momentarily. i checked the so called stone, and it looked like a standard beach pepbble with a tiny bit of quartz attached. What could it have been? that would have passivated in the water and not completely reacted until the inert skin was broken. my grandparents claim it was the sunlight that triggered the exothermic reaction. Anyway, they say the flames werent blidingly bright which possibly rules out alkali metals, plus it was yello which rules out lithium ontop of the meals, as well as the fact that it had previously been under water. does anyone know what it is? like i siad, it looks like standard smoothed beach rock now, its exterior was what burnt.

Question by oldmanbeefjerky   |  last reply


MIT Open-couseware Helps Physics Professor Become a Web Star

Open-courseware is helping some MIT professors gain much deserved recognition. While I never took a class from Walter Lewin, I did watch a Nobel laureate (before he won the prize!) ride that same rocket-powered tricycle across the stage of 26-100 (I wrote a little bit about that here in a comment).At 71, Physics Professor Is a Web StarCAMBRIDGE, Mass. Walter H. G. Lewin, 71, a physics professor, has long had a cult following at M.I.T. And he has now emerged as an international Internet guru, thanks to the global classroom the institute created to spread knowledge through cyberspace.Professor Lewin's videotaped physics lectures, free online on the OpenCourseWare of the Massachusetts Institute of Technology, have won him devotees across the country and beyond who stuff his e-mail in-box with praise."Through your inspiring video lectures i have managed to see just how BEAUTIFUL Physics is, both astounding and simple," a 17-year-old from India e-mailed recently.Steve Boigon, 62, a florist from San Diego, wrote, "I walk with a new spring in my step and I look at life through physics-colored eyes."Professor Lewin delivers his lectures with the panache of Julia Child bringing French cooking to amateurs and the zany theatricality of YouTube's greatest hits. He is part of a new generation of academic stars who hold forth in cyberspace on their college Web sites and even, without charge, on iTunes U, which went up in May on Apple's iTunes Store.In his lectures at ocw.mit.edu, Professor Lewin beats a student with cat fur to demonstrate electrostatics. Wearing shorts, sandals with socks and a pith helmet -- nerd safari garb -- he fires a cannon loaded with a golf ball at a stuffed monkey wearing a bulletproof vest to demonstrate the trajectories of objects in free fall.He rides a fire-extinguisher-propelled tricycle across his classroom to show how a rocket lifts off.

Topic by ewilhelm   |  last reply


Converting gravitational potential energy into air pressure to launch a projectile?

Hello my name is Aaron! I am a high school senior from northeastern Kentucky designing a pneumatic system of sorts for a science competition and need some help. I will be building a device that converts gravitational potential energy, from a falling mass, into air pressure (or possibly the movement of air depending on the design) to launch a projectile a specific distance (max distance needed is 8.25 m). What I am thinking about doing is using one double action pneumatic cylinder (DAPC) as a bellow in which a falling mass (max 3.500 kg at a max 90 cm) would strike its piston shaft, creating positive pressure within the system. With that positive pressure another DAPC’s piston would simultaneously strike our projectile sending it airborne in theory. Below there is an illustration of my idea, sorry about the poor quality. So what I need help determining is would this design work before I start buying parts? If so what approximate sizes should the two cylinders be and should they be different sizes to maximize the force exerted on the projectile? If you have any other ideas concerning the design or any questions about the project PLEASE feel free to share!!! Below are some of the design rules that pertain to this project along with some notes in italics about them. Thank you very much for your time in advance! ------------------------------------------------------------------------------------------------------------ Description:    -Prior to competition, teams will design, construct, and calibrate a single device capable of launching projectiles into a target and collect data regarding device parameters and performance. Design Constraints:    -The launching force must be entirely supplied by the gravitational potential energy from a falling mass less than or equal to 3.500 kg. Any device part whose potential energy decreases and provides launch energy is considered part of the mass. The mass may consist of multiple discrete parts, which together count as the total mass.    -During each launch, the gravitational potential energy must be converted to air pressure or air movement, which is then used to launch the projectile, either directly (e.g., pop gun style, etc.) or indirectly (e.g., using a pneumatic cylinder to swing an arm, etc.) All device air chambers must start at ambient air pressure and must automatically return to ambient air pressure.    -The launching device (would look similar to this with the adjustable angle to accommodate different ranges), including the projectile and all components, must fit within a 75.0 cm x 75.0 cm x 1.00 m box in ready-to-launch configuration, in any orientation chosen by the team. Weights used to stabilize the device must be within the box.    -The triggering device (would look something like this except elevated with a mass suspended ready to be released) in not considered part of the device and must not contribute energy to the launch. It must extend out of the launch area, allow for the competitors to remain at least 1.00 m away from the launch area, and does not need to return to the launch area after launch. The triggering device must not pose a danger to anyone due to flying parts or excessive movement outside the launch area.    -Teams must provide unmodified tennis, racquet, ping pong, and/or plastic practice golf balls to be used as projectiles. Teams may change projectiles for each launch.    -The launching device must be designed and operated in such a way to not damage or alter the floor.    -Electrical components are not allowed as part of the device or triggering device. The Competition:    -Two targets, designated by small marks on tape on the floor or panels lying on the floor, must be placed in front of and centered on an imaginary line parallel to the launch direction that bisects the launch are. Supervisors are encouraged to place sand, cat litter, or similar substance in the area around the targets to help indicate landing spots.    -The targets must be placed in front of the launch area at distances between 2.00 m and 8.00 m (in intervals of 10 cm). A distance of at least 2.00 m must separate the targets. Target distances must not be announced until after impound is over and must be the same for all teams. Room ceiling height should be considered when setting the distances.

Question by ahoback   |  last reply