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#1
10-07-2004, 11:49 PM
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members with disturbed childhood: READ
So I have to build a projectile launcher for my physics class. The guidelines are that it must launch a marble/ball bearing between 5 and 10m with good accuracy. No explosives or compressed air. Anyone whip up some plans or ideas for a nice and easy launcher, one that preferably can kick all my other classmates' asses?
__________________
"The greatest Americans have not been born yet, they are waiting patiently for the past to die" 
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#3
10-08-2004, 12:19 AM
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Re: members with disturbed childhood: READ
Drainpipe bazooka.
2 metres of 3 inch drain pipe, bicycle inner tube for a slingshot.Cut innertube and fix ends over one end of pipe.String from back of slingshot through pipe to a winder on the back end.Ratchet the string up until slingshot is good and tight,then take aim and cut string. Also good for firing bamboo garden canes.
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#5
10-08-2004, 12:25 AM
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Re: members with disturbed childhood: READ
^no compressed air or explosives^
hmm... would a slower-burning material count as an explosive, per se?
__________________
 SoStAsSaId: and the flight attendant is cute... if i was a lesbian, i'd join the mile high club  <---call this number
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#6
10-08-2004, 01:42 AM
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Re: members with disturbed childhood: READ
Keep in mind, if you want accuracy, you need to figure out how to spin the ball before it gets airborn. Think of like a paintball gun... I do believe they have a little rubber piece inside the barrel that spins the paintballs.
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#8
10-08-2004, 02:00 AM
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Re: members with disturbed childhood: READ
Take a look at the older rifle style pellet guns. They are essentially a really strong spring and plate at the base with a long barrel for accuracy. The hardest part would be figuring out how to compress the spring and hold it there until you want to release it. If built right, it could pack a pretty good punch.
__________________
 1977 GMC Jimmy - daily driver-sitting on 33's and bedliner inside and out 1995 9C1 Caprice - winter beater 1994 Impala SS - newest project 1991 9C1 Caprice - (rip) "There are two great problems in the world today; an ever-growing lack of common sense, and too many warning labels. Take away all of the warning labels and the problem will work itself out..." -B
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#10
10-08-2004, 02:32 AM
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Re: members with disturbed childhood: READ
steel tube about half and inch wide,
cut off long finger of a glove, attach glove finger to end of steel tube using heaps of duct tape. Put marble in the glove finger and pull back. (use longer tube for accuracy)
__________________
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#12
10-08-2004, 03:00 AM
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Re: members with disturbed childhood: READ
I built a tabletop model once... I found the plans for a full size model on-line lemme google it right quick...
__________________
"I'm a simple man really, all I need is enough sleep for two men, enough drink for three, and enough women for four." -Walter Slovotsky Black 1993 Porsche 968 Coupe (official compensation vehicle.) 1999 Ford Ranger (Fishing and Track Support Vehicle) 1999 Toyota Corolla (Official low maintenance, high gas mileage commuter car)
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#13
10-08-2004, 03:04 AM
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Re: members with disturbed childhood: READ
Ahhhh Here we go, tennis ball trebuchet.... Have fun, post pictures
http://www.ripcord.ws/plans/plans.html
__________________
"I'm a simple man really, all I need is enough sleep for two men, enough drink for three, and enough women for four." -Walter Slovotsky Black 1993 Porsche 968 Coupe (official compensation vehicle.) 1999 Ford Ranger (Fishing and Track Support Vehicle) 1999 Toyota Corolla (Official low maintenance, high gas mileage commuter car)
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#14
10-08-2004, 04:04 PM
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Re: members with disturbed childhood: READ
Oh yeah, no trebuchets/catapults.
I'm leaning towards a simple spring and plate system. Anyone have any ideas for holding the plate back until its time to release?
__________________
"The greatest Americans have not been born yet, they are waiting patiently for the past to die"
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#15
10-08-2004, 05:04 PM
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Sounds like a fun project... I don't think a trebuchet would work very well for something as light as a marble or ball bearing anyways.
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