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Project by ChrisK posted 04-02-2013 11:51 PM 4358 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


8 posts in 3090 days

#1 posted 04-02-2013 11:56 PM

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

Thanks for sharing

View ChrisK's profile


2053 posts in 4165 days

#2 posted 04-03-2013 12:03 AM

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


3296 posts in 3340 days

#3 posted 04-03-2013 12:19 AM

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


9201 posts in 3492 days

#4 posted 04-03-2013 12:51 AM

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 3124 days

#5 posted 04-03-2013 01:11 AM

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


2063 posts in 2995 days

#6 posted 04-03-2013 01:15 AM

Always wanted to build one. Great job!

-- Tim P. Calhoun GA. If traffic is passing you on the right, YOU ARE IN THE WRONG DAMN LANE.

View Lanaug's profile


188 posts in 3292 days

#7 posted 04-03-2013 12:31 PM


View helluvawreck's profile


32122 posts in 3950 days

#8 posted 04-03-2013 12:33 PM

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

helluvawreck aka Charles

-- helluvawreck aka Charles,

View drbyte's profile


848 posts in 5145 days

#9 posted 04-03-2013 02:07 PM

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


90 posts in 3178 days

#10 posted 04-03-2013 07:03 PM

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


489 posts in 4711 days

#11 posted 04-03-2013 07:04 PM

Awesome!!! Stinkin’ Awesome!!!

-- The more skilled you are at something, the worse you are at it when someone is watching.

View JoeinGa's profile


7741 posts in 3090 days

#12 posted 04-03-2013 07:55 PM

”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


675 posts in 4299 days

#13 posted 06-12-2013 06:35 PM

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

-- Cheers and God Bless

View Anthony's profile


127 posts in 2795 days

#14 posted 10-26-2013 05:08 PM

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


69 posts in 2619 days

#15 posted 07-17-2014 06:09 PM

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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