07.13.2007
Categories: Old Posts
This year of making videos has been awesome! Making something and then making a video about how to make it every week has been an incessant and intense year! Let’s celebrate by making a jam jar jet!
This pulse jet works by igniting a flame, which pushes the gas out of the jar and then bit of a vacuum that it leaves sucks the air back in and the circle is repeated. Watch the video and download the pdf to learn how to make it!
I haven’t done this alone, the guests on the show have brought their expertise to it. Thanks to everyone who’s been a part of this show! Also, thanks to you for watching and commenting!
Weekend Projects is sponsored by Microchip Technology. Check out their seminars and the Microchip Masters Conference.
Funny, I got a laugh out of the episode. I looked at the glass and was thinking, man I hope that thing doesn’t shatter”. I was also looking at the tarred roof and appreciated your safety measures.
I built a jam jar jet and it works well but I am having trouble understanding how this thing works and the power it is perducing. Culd you please explain this so I can understand? thanks.
Congratulations on your 1-year anniversary. I love the weekly videos!
here’s the wikipedia page on pulse jets
the german V2 buzz bomb was a pulse jet….
http://en.wikipedia.org/wiki/Pulse_jet
@chris
The V-1 was a pulse jet. The V-2 (Vergeltungswaffe Zwei, also known as the A.4) was a true liquid-fueled rocket.
You so rock, hero man. I’m working my way thru the archives, makin as I go - thanks to teh dude… Bre. Keep it goingggg.
Nice experiment…but I noticed you put the jar in the fridge to make it cooler so it wouldn’t be as likely to break. In fact it may have increased its likelihood for breakage since the breaking occurs due to thermal shock, not the heat itself. The thermal shock represents the transition of the material in size as represented by it coefficient of expansion. Glass at room temperatures can only do this slowly and the cooler the glass the slower it must be done. One way around this is to insure that the heating is very even thereby using the natural structural strenght of the glass when it is in an evenly distributed curve (like a sphere)to overcome the stresses expereinced during the heating or cooling…the thermal shock. Glass madness is mass gladness.
Bre,
It would be nice to see your eyes without all the reflections in your glasses.
Maybe you could either 1) move the light source, or 2) get some coated lenses in your glasses.
Thanks for the great vids!
Mic
how much force does this produce? can you strap it to a toy car?
Dammnit.. I had this idea like 6 months ago (only using beer cans)
MIT has their rocket science class online with a neat applet for rocketry.
Don’t wear gloves when using a drill like that. Not a safe practice - the drill could grab the glove and oops! Broken finger bones!
[...] and then bit of a vacuum that it leaves sucks the air back in and the circle is repeated. From: http://www.brepettis.com/blog/2007/07/13/weekend-project-birthday-make-a-jam-jar-jet-make-video-podcast... (PDF Available) PSST! Pass it on… Did you like this [...]
where do i get the ring things that i put iside the jar? also, i dont have a drill thing, so can i just poke the holes with nails and a hammer? is the wire just regular wire?
were can i get a defuser and what is it made of pls e-mail me at corvettelover1994@hotmail.com