### Project Information

This puzzle was dropped off on my desk last week. The "rocket" is placed in the cup. You must remove it without dumping it out or using tools (paper clips, tape, etc.). The problem is that there is no place to grab the rocket. How do you get it out? See video at the end if you can't figure it out.

I usually make projects from wood but I don't have a lathe. Therefore, I opted for a 3D print (white/magenta version) with dimensions taken from the wood version. I've included drawings in case someone wants to make their own.

More Info: https://www.instructables.com/id/Newtons-Gravity-Defying-Puzzle-3D-Print/
Video Solution:

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### Comments

#### Dark_Lightning

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Are you allowed to pick it up? If so, you can pick it up, and lower it quickly and the rocket will pop out.

#### mtairymd

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No. It must sit on a flat surface. The solution is interesting

Are you allowed to pick it up? If so, you can pick it up, and lower it quickly and the rocket will pop out.

- Dark_Lightning

#### 000

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Both solutions are extreme.
People don't carry air nozzles and compressors with them, and who would be expected to pour water on someone else's puzzle?
I could probably light the outside on fire too, and after it burns out I could grab the middle.
It did get me to watch your video though, if that's what it was designed for.

#### mtairymd

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Let me clarify. An air compressor isn't needed. It was easier for me to make the video with an air hose. The solution is to blow either down or across the "rocket". It pops right out.

Both solutions are extreme.
People don t carry air nozzles and compressors with them, and who would be expected to pour water on someone else s puzzle?
I could probably light the outside on fire too, and after it burns out I could grab the middle.
It did get me to watch your video though, if that s what it was designed for.

- jbay

#### Desert_Woodworker

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I like this Q: is this about density or bouyancy? Also, this promotes what the new generation likes- Wood but also composites with the machines that produce them CNC, laser and 3d printers

#### Desert_Woodworker

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Both solutions are extreme.
People don t carry air nozzles and compressors with them, and who would be expected to pour water on someone else s puzzle?
I could probably light the outside on fire too, and after it burns out I could grab the middle.
It did get me to watch your video though, if that s what it was designed for.

- jbay
There are other substitutes for water - just think what a man in the woods would do….

#### Dutchy

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GREAT.

Is measerment in " or mm?

#### mtairymd

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The dimensions are in inches. Sorry about all the significant figures and non-standard sizes. I used calipers to take the measurements and didn't need to worry about drill sizes since I was printing it.

GREAT.

Is measerment in " or mm?

- Dutchy

#### mtairymd

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Thanks. The density/buoyancy would be in play if you filled the cup with water. The real solution is to blow on it.

I realized that I'm still a very amateur woodworker a while back while trying to make a block pin puzzle. http://lumberjocks.com/projects/304650

My 3D print of the same part went together perfectly. It took a lot of sanding and a hammer to get my wood version to mate.

I like this Q: is this about density or bouyancy? Also, this promotes what the new generation likes- Wood but also composites with the machines that produce them CNC, laser and 3d printers

- Desert_Woodworker

#### mtairymd

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Funny. I couple of people asked if they could suck it out. I said sure but that would be pretty nasty after Bob and Bill just tried that.

Both solutions are extreme.
People don t carry air nozzles and compressors with them, and who would be expected to pour water on someone else s puzzle?
I could probably light the outside on fire too, and after it burns out I could grab the middle.
It did get me to watch your video though, if that s what it was designed for.

- jbay

There are other substitutes for water - just think what a man in the woods would do….

- Desert_Woodworker

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#### Iamjacob

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I like this Q: is this about density or bouyancy? Also, this promotes what the new generation likes- Wood but also composites with the machines that produce them CNC, laser and 3d printers

- Desert_Woodworker
It's about pressure differences. When the air is not moving the pressure inside is the same as the outside. When you blow over the top of the surface the fast moving air has a lower pressure and the air inside pushes the "rocket" out.

This is the same principal as how airplanes fly.

#### Desert_Woodworker

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I like this Q: is this about density or bouyancy? Also, this promotes what the new generation likes- Wood but also composites with the machines that produce them CNC, laser and 3d printers

- Desert_Woodworker

It s about pressure differences. When the air is not moving the pressure inside is the same as the outside. When you blow over the top of the surface the fast moving air has a lower pressure and the air inside pushes the "rocket" out.

This is the same principal as how airplanes fly.

- Iamjacob
Thanks for this explanation.

#### majuvla

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Very fun to look at those shapes and colours.

#### Natobious

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I made one of these, just used heavy grid sander to make the cone shape on the end of dowel rod , then cut it off.
sand the outside so there is a little gap around the forstner bit hole. I didn't hollow mine out. sucking didn't work on mine. a simple strong blow and it would pop completely out of the hole. some people were able to lick their fingers and get it out. all in all it is a good device especially when combined with other puzzles.

#### mtairymd

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Yeah, I was trying to figure out a way to make the cone shape without a lathe. If only I had a 1" diameter pencil sharpener . People tried 10 different ways to get it out but nobody tried the finger licking trick.

I made one of these, just used heavy grid sander to make the cone shape on the end of dowel rod , then cut it off.
sand the outside so there is a little gap around the forstner bit hole. I didn t hollow mine out. sucking didn t work on mine. a simple strong blow and it would pop completely out of the hole. some people were able to lick their fingers and get it out. all in all it is a good device especially when combined with other puzzles.

- Natobious