jmacuk

I was going to ask about the science behind this, but clearly someone beat me to it.

Word to the wise: I tried to make this project really inexpensively, but this does not work with a Nail in Donut setup...

WOW! You and your girlfriend were made for each other! Now for a matching shirt for you...

ooooh, now that's clever!

I love your use of recycled junk! Well done! I've also suggested on YT to make a jet-powered hoverboard out of a skateboard...

Thanks!

PVC and duct tape! I'm sold!

Awesome instructable, I had no idea how involved making a bullwhip was! I now know that I will never be able to make one, but I would love to know where I can get one for my physics class, so I can demonstrate cracking the sound barrier. Can you add some links for Nick Schrader and others who make and sell these whips?

Very nice - but please DO NOT use weight and mass interchangeably! It takes so much time and effort to uproot that misconception later. A simple task to illustrate the difference is to have your lab rats blow their strawkets horizontally, and then use the same force to launch vertically: they should see a noticeable difference in how far they travel. If necessary, add some extra mass like paperclips. (Which makes a good variable for Newt's 2nd law anyway.)Another fun investigation -outdoors- is to poke a hole or two in the bottom of a cup, and fill it with water while sealing the hole(s) with their fingers. Students can investigate what happens when you merely unplug the holes, or release the hole cup : )

"Strawkets". Love it!

I thought it was exceptionally clever, too. : )

Have you got any estimates of the maximum amount of energy stored in a typical mousetrap? (I use Victor, very similar to yours) I find wildly varying answers online; my estimate is ~150 mJ

Thanks! Will have to go back and try some more measurements.

Very thorough description of the MA! I had one group of students build a conical camshaft onto their axle, so that they could accelerate quickly with low MA, then shift to high MA cruise.

"A hole other level of fun" I see what you did there!

LOVE IT! Now, is there and instructable for making your own duct tape?

Way cool! Can this work with a single servo driving nested spindles, like a second, minute and hour pointer?

Fantastic way to have fun and learn a ton! Well done, sir!

I've got to hand it to you, that is a handsome project! I copied your video to edpuzzle so I can show my engineering class your engineering design process. Might have to take out the wooden humor, though... : )

I have to hand it to you, that is a very silly solution. : )

Very cool! Will other common household chemicals produce their colors, particularly green or blue?

What an awesome way to combine space and time!

The Wright brother’s flyer was the first successful powered heavier than air aircraft that flew in controlled flight while carrying a human. Previous attempts were either unpowered, unsuccessful , uncontrolled or undocumented and therefore not recognized .

Impressive. Most impressive.

Very nice! Maybe use bungee cords instead of daisy chaining springs?

Upon reflection, this is an awesome variation of a traditional kalidescope!

Awesome new design! I can't wait to share it with my students!

I like your method of showing flow rate as mass/time: too often my students confuse that with flow speed. DanM17 is correct that there are limits to modeling electric current with flowing water in tubes. Did you test with minimal length tubing, that is, straight drop with no loops? Try the same length of tube stretched straight, at various angles, to create different heights. Also, if practical, rig multiple reservoirs with different diameter tubes: if you can achieve laminar flow, it will model different resistances. If not, you'll have a great counterintuitive model to puzzle your students with : )

So where is Daddy's X-wing?Awesome work!

Very nice! And don't forget how to remove a cork from a wine bottle with a plastic bag!

You learn something new every day : )

This looks very cool! Anyone want to try making a simulated Chladni Plate with this?

That is a great solution to the flaming exhaust pillar! Never would have thought of using otton that way. Awesome work!

Brilliantly simple idea!

clever use of atmospheric pressure! Basically a big suction cup.

If you paint the inside black or line it with black construction paper, you can improve the brightness and clarity of the image being projected.

very cool!

THANK YOU FOR POSTING THIS! My engineering kids need to see that Murphy's law happens! The reason there is an engineering design process that cycles around is because things hardly ever work as intended the first time. Or second, etc.I wish more people would post Destructables (thanks Scaredy Cat!), showing all the ways that projects can go south or be FUBAR. Unless you "really" want to make bacon.PS. As long as you're reading labels more carefully now, double-check whether your garage is coatedin in carcinogens: you may need to powerwash or wipe down all surfaces.

Sweet! Nice work, well focused directions.

Nicely done! Can see this as a great project for either astronomy or photography classes!

you go straight ahead, of course!

Great job! You could go into business making those.

nice!

I'm trying to add this to one of my collections but don't see an option to do so. Is there some restriction on this instructable?

elegant solution!

Nice! I'm going to add this to my engineering class - after we file the points off.

I wonder what twisted genius came up with it?

good point

A further thought, though not as green, is to line the bottle, or maybe even replace the bottle, with a used plastic bag? Then you could dispose of the messy contents and replace with a new bag & mixture.

I think I now know how I am going to ignite my 2L flour-bottle rocket!

nice variation!