Be an Aeronautical Scientist: Make your Own Jet Engine for a few Pennies.

Step 3 What goes wrong...

"Daddy, show us how you made the jet engine!"

"Not a problem", thinks I.

I grabbed another jar, smacked a hole in the lid, splashed in some meths and lit it.

Foosh, then nothing. It didn't work. (There's not much point watching past the first few seconds of this video.)

After some research, it turned out that the hole was too big. If you make a jam jar jet, and it goes foosh and then does nothing, like it does in the first video above, then the hole in the lid is too big. Go make another one.

(Later)

If your jet lights, goes foosh, and then goes RRRR for a moment, like it does in the second video, then your hole is not quite big enough.

Comments

[orangetj]

second one sounded like a fart as imature as that may sound

[dakkenly]

Lol I made a quick one and it went WRRNT real quick lol really loudly... Dunno what to think, half too big half too small!

[Greygh0st]

nice analyzation. this is the most useful tech i've found on these.

[dynamite boy]

those are actually called pulse jets.

[Wolfie42]

hehe i love the second one but i wouldent stick it under a cussion or on a cair like a whoopy custion :O O.o damn that would hurt

[nathan42100]

Heh, the second one sounds like a fart!

[instructa-fan]

good call!