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Potato cannon carriage #6: Some tweaks and the test firing

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Blog entry by JJohnston posted 1421 days ago 3325 reads 0 times favorited 29 comments Add to Favorites Watch
« Part 5: Forward armor Part 6 of Potato cannon carriage series Part 7: Artwork and final assembly »

I made a few little improvements this week while I’m finishing the forward armor.

I redesigned the forward ramrod tube bracket. It’s as minimal as I could get it – a 3/4” piece of poplar, cut to fit between the tubes, and a hose clamp. This lightens up the front end, both visually and literally. I also reattached the cap chain with a ziptie right behind the cap, which shortens/cleans it up. A shot of green paint and everything looks fine.

I had a vision of kids (my brother’s) fighting over the trigger switch, so I put connectors at both ends of the wires to act as breakaways in case somebody yanks on it.

I added a bracket to hold the trigger switch and wires. It’s a piece of 1-1/2” PVC with a cap (actually the end of the first ramrod tube) with a slot cut down the side, and a small block to hold it away from the elevating arc. The cord wraps around the block and the trigger switch drops into the tube.

And finally, the moment of truth – the test shots. I’m on my back patio, shooting at a piece of solid core door leaning against the wall about 20’ away. These are the first and third shots, and they’re weak. I didn’t record the second shot, and I wish I had – it went POW!! and made the dent you can just make out in the upper left quadrant of the door in the latter part of the video. It dented the near side almost 1/2” and pushed out a bulge on the back! I don’t know what I did differently on that shot; I know I didn’t stop to do any narrative, which I did on #1 and 3 (edited out).

Next installment: artwork

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."



29 comments so far

View Jack_Isidore's profile

Jack_Isidore

89 posts in 1440 days


#1 posted 1421 days ago

WOAH! Very cool looking potato gun. Any idea what the velocity you get out of it is?

View brunob's profile

brunob

2275 posts in 2756 days


#2 posted 1421 days ago

Ya could stand in o0ne place and plant a whole acre of potatoes. Neat!

-- Bruce from Central New York...now, if you'll pardon me, I have some sawdust to make.

View sawblade1's profile

sawblade1

754 posts in 1614 days


#3 posted 1421 days ago

Awesome man Cool toy!!!! :)

-- Proverbs Ch:3 vs 5,6,7 Trust in the lord with all thine heart and lean not unto your own understanding but in all your ways aknowledge him and he shall direct your path elmerthomas81@neo.rr.com

View Manitario's profile

Manitario

2245 posts in 1470 days


#4 posted 1421 days ago

very nice! I’m going to have to make one of these.

-- Sometimes the creative process requires foul language. -- Charles Neil

View RonPeters's profile

RonPeters

708 posts in 1467 days


#5 posted 1421 days ago

That is so cool! What you using for fuel? Hairspray?

-- “Once more unto the breach, dear friends...” Henry V - Act III, Scene I

View lew's profile

lew

9921 posts in 2342 days


#6 posted 1421 days ago

SO COOL!!

I could use one of these to scare the squirrels out of the garden ;^)

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View JJohnston's profile

JJohnston

1577 posts in 1878 days


#7 posted 1421 days ago

Actually, you’d just be shooting food at them, so I don’t know how well it would work. Fuel is Static Guard.

Velocity – I couldn’t even begin to guess. There’s so much inconsistency between shots, I don’t know if knowing would be of any use.

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."

View JAGWAH's profile

JAGWAH

929 posts in 1671 days


#8 posted 1421 days ago

Absolutely cool. You are a bad boy. Ok when we all team up for the potatoe wars I want to be on your side.

-- ~Just A Guy With A Hammer~

View JAGWAH's profile

JAGWAH

929 posts in 1671 days


#9 posted 1421 days ago

So you core a potato, insert an egg, cap the potatoe and fire. Splat and ewwee! Cool

-- ~Just A Guy With A Hammer~

View nailbanger2's profile

nailbanger2

952 posts in 1730 days


#10 posted 1421 days ago

The only time I saw one firing, they used hair spray and the tighter the fit, the farther it went.

-- Wish I were Norm's Nephew

View JJohnston's profile

JJohnston

1577 posts in 1878 days


#11 posted 1421 days ago

It may depend on the shape of the potatoes, too. The ones I got are kind of flat, rather than football-shaped, so when they go down, they’re short. I’ve had better luck with nice, round bakers that end up about 1 caliber long.

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."

View nailbanger2's profile

nailbanger2

952 posts in 1730 days


#12 posted 1421 days ago

I remember they actually had taters that were too big, stuffed them in there so the sides scraped the skin off and formed an airtight seal.

-- Wish I were Norm's Nephew

View kidi's profile

kidi

15 posts in 1799 days


#13 posted 1421 days ago

Very COOL! I’ve been waiting for this post to see the final project.

-- paul, mmsmarimbas.com

View JJohnston's profile

JJohnston

1577 posts in 1878 days


#14 posted 1421 days ago

That’s the way it’s done. You can see in the second picture above that the muzzle is sharpened. I fired the test shots before I took the picture, so you can also see some potato residue on it.

@kidi: it’s not done yet. The best part is yet to come.

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."

View Brad_Nailor's profile

Brad_Nailor

2531 posts in 2544 days


#15 posted 1421 days ago

Cool…I like your idea for the bracket…really simple but it looks great. I thought it would fire with more velocity than that..do you have it purposely dialed down due to the fact that kids will be using it?

-- http://www.facebook.com/pages/DSO-Designs/297237806954248

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