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Project by ChrisK posted 505 days ago 2068 views 8 times favorited 16 comments Add to Favorites Watch

Built this for Pack 477 to use on there warm weather camp outs. It makes a great water balloon tosser. There are a few tweaks left to maximize the range. I need adjust the release pin angle and sling length along with the weight.

A few stats:

Weight (with empty weight box) 105 Lbs.

Swing arm 95 inches long. 4.5 to 1 ratio.

Length 72 inches, width 46 inches.

Maximum design swing weight 100 lbs.

I want to say there was 20 to 30 hours of design and drawing, at least 60 hours of build time. Every piece was run through the thickness planer and table saw to make 2×4 into 1-1/4×3. Help make the layout for final cuts a little easier. I would say I had 50 or 60 gallons of paced shavings. I plan on building a falling arm version this summer. I doubt I will run all those pieces through the planer.

All in all it was fun, but next time I will leave the 2x’ as is were I can. I think it would be pretty easy to make this 1/2 the size out of 1 x and have pretty much the same results with water balloons.

Try one you will like it.

-- Chris K

16 comments so far

View Bzern's profile


4 posts in 632 days

#1 posted 505 days ago

That’s great! How far can it throw a water balloon?

Thanks for sharing

View ChrisK's profile


1087 posts in 1707 days

#2 posted 505 days ago

Right now it was throwing about 75 feet, trying for 125 to 175. Need a thicker balloon so they do not break from the acceleration of the longer sling.

-- Chris K

View AandCstyle's profile


1286 posts in 882 days

#3 posted 505 days ago

These are great. I often recommend somewhat smaller models as nice father-son, grandfather-grandson projects. I hope that doesn’t sound too sexist, but in my experience that is the way it works out 95+% of the time. Smaller ones can be used indoors with ping pong balls, etc. I first learned to enjoy them watching Monte Python launching cows (not really, of course). Anyhow, they can be a great introduction to woodworking and engineering.

-- Art

View woodbutcherbynight's profile


1247 posts in 1034 days

#4 posted 505 days ago

Nice work, for a good cause. I have to wonder, do you need a license for that????? (laughing)

-- Live to tell the stories, they sound better that way.

View Mike's profile


139 posts in 666 days

#5 posted 505 days ago

Awesome! The boys will love it!! Now you just need to make it mobile, that would be icing on the cake right there. Nice job! I gotta try one of these someday

-- A person of integrity never speaks of it...he walks in it...

View KelvinGrove's profile


748 posts in 538 days

#6 posted 505 days ago

Always wanted to build one. Great job!

-- Tim P. Calhoun GA. Don't cry because it's over, smile....because for 7 glorious miles, everyone thought you were the real bus driver!

View Lanaug's profile


161 posts in 834 days

#7 posted 505 days ago


View helluvawreck's profile


15582 posts in 1492 days

#8 posted 505 days ago

I love these things. They are fascinating. Good work.

helluvawreck aka Charles

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View drbyte's profile


562 posts in 2687 days

#9 posted 505 days ago

Nice job! Always enjoyed the father-son scout and 4H projects myself. And I’m sure there’s no license needed as long as you keep it under 10 balloons ready to fire!!!

-- Dennis, WV

View DBuonomano's profile


79 posts in 721 days

#10 posted 505 days ago

Great build, looks like a fun project! Oh, the things I could have done with this as a kid… makes my old sling shot look rather inadequate!

View Sawdustonmyshoulder's profile


253 posts in 2253 days

#11 posted 505 days ago

Awesome!!! Stinkin’ Awesome!!!

-- Makin' Sawdust!!!

View JoeinGa's profile


3157 posts in 632 days

#12 posted 505 days ago

”It makes a great water balloon tosser”

Oh yeah, and just wait till a can of beans comes flying thru your tent one night! LMAO

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View Kristoffer's profile


670 posts in 1841 days

#13 posted 435 days ago

That is awesome. Where can I find plans to make one?

-- Cheers and God Bless

View Anthony's profile


118 posts in 337 days

#14 posted 299 days ago

Nice work! I can’t wait to build my bigger version.

Do you have any video of it in action?

-- Anthony - "The blacksmith and the artist, reflect it in their art. They forge their creativity, closer to the heart"

View DiggerJ's profile (online now)


55 posts in 162 days

#15 posted 35 days ago

It is a good day when two of the top four projects on the homepage are siege weapons! LOL

Does that mean that a battering ram can’t be far behind?

-- Digger -- If you work long enough and hard enough to make it idiot-proof...the world will build a better idiot!

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