| Project by USCJeff | posted 613 days ago | 2270 views | 10 times favorited | 8 comments | ![]() |
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Before I get into this one, anyone want to take a guess at which shot the furthest (see pic 6 to see Alien, Whopper, or Skittle)? See bottom for the answer.
Lowe’s carries a line of simple children’s projects that are designed to be fun and with safer methods. That’s great, but in reality the end product is at best fragile. The method and process are the aim. The Catapult uses a lot of pre-cut pieces that are very similar to Popsicle sticks. It also had wheels on it which would make it much harder to shoot versus a solid base. A couple reviews of the product stated the cross bar that the “spoon” slams into breaks after a few uses.
My 4 year old helped out here and there on this one. He did some sanding, finishing, and got glue on everything. I didn’t sand out most of it since “I like it like that” was his response. The walnut base is face to end grain butt joints (Not normally the best idea). The vertical arms and the braces are glued as well. The braces connect to the arms via lap joints. The crossbar is also a glued lap joint. The Lap joints take the real force making taking most of the pressure of the weaker butt joints. I suppose a dowel or brad could always reinforce it, but it seems as if it should hold under a kids use. The spoon is hard maple and has two holes drilled. One is to allow for the dowel to go through it and the other is for the rubber-band. and Yes, I’m not that big on carving and didn’t really go to town cleaning up the concave portion of the spoon. I put a couple holes near the cross bar to facilitate the knots. The rubber band in all likelihood will break if he abuses it. I found a pretty thick one in a drawer, so I think it’ll be fine for a while.
As to the shooting trials. . . The Alien went about 11 feet (Jacob attached a jet pack (really scuba gear) to make him go further). The whopper was in the ballpark of 15 feet. The Skittle is lethal. It kept hitting the ceiling about 10 feet from the coffee table it was shot from. Took it to the driveway and it easily cleared 20 feet.
-- Jeff, South Carolina
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8 comments so far
Brett
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472 posts in 928 days
#1 posted 613 days ago
This is great Jeff! I like that it is more about Jacob and not the catapult. Keep up the good work with your son and your projects. Shaping a soul and some wood are both worthy endeavours but the soul will outlast the wood by far.
We have a couple of catapults that my Dad actually made. One is an onager like the one you made and the other is a trebuchet. The trebuchet looks cooler but the onager really out performs it. Ours (onager)uses a different design to provide the power to launch and we can get about 175’-200’ from a marble! I was amazed, to say the least.
-- Hand Crafted by Brett Peterson John 3:16 http://www.TheCrookedNail.blogspot.com
racerglen
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1694 posts in 949 days
#2 posted 613 days ago
Brett, do you warn the neighbours when you’re going out to play ?
That’s pretty good range !
Jeff, I’m with Brett on the posting, great to be working with the boy, but I wouldn’t show him this, you could end up making bigger and better units (maybe open the window ?)
-- Glen, Vernon B.C. Canada
TopamaxSurvivor
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13192 posts in 1845 days
#3 posted 613 days ago
Nice modification, I’m sure the kids will love playing with you dad! ;-)
-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence Wake Up America!! Please read; http://www.commondreams.org/view/2009/01/26-0
DesertNavy
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5 posts in 613 days
#4 posted 613 days ago
Jeff, very cool!
souichiro
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369 posts in 1515 days
#5 posted 613 days ago
Very very cool indeed!
-- Dale, Oregon
KnotCurser
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1409 posts in 1237 days
#6 posted 613 days ago
Awesome build and design!
One thing you might want to do is to place a piece of rigid foam where the arm meets the crosspiece to lessen the impact and chance of cracking. It won’t diminish the distance either – don’t ask me how I know this. ;-)
Great piece!
-bob
-- Man is a tool-using Animal. Nowhere do you find him without tools; without tools he is nothing, with tools he is all. - Thomas Carlyle http://www.ffrf.org
USCJeff
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1041 posts in 2237 days
#7 posted 613 days ago
Right on Bob. I actually had a piece of self-adhesive felt laying around and had it one the cross bar at first. It didn’t seem to do anything. The difference sound on contact was indistinguishable. Some type of foam as you mentioned would work. Anything spongy I suppose.
-- Jeff, South Carolina
Lockwatcher
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78 posts in 861 days
#8 posted 613 days ago
I made something like this for our scout group a few years ago…
Marshmellow Catapult
Ken C.
-Lockwatcher-
-- Lockwatcher, Ohio, http://www.lockwatcher.com/
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