Comments on: Weekend Project Birthday - Make a Jam Jar Jet! - Make: Video Podcast

By: zac sisco

zac sisco — Sun, 10 Feb 2008 03:07:31 +0000

were can i get a defuser and what is it made of pls e-mail me at corvettelover1994@hotmail.com

By: alex

alex — Sat, 24 Nov 2007 21:42:56 +0000

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?

By: PSST! it / HOWTO Make a Jet Engine From a Jar of Jam

PSST! it / HOWTO Make a Jet Engine From a Jar of Jam — Tue, 24 Jul 2007 19:10:11 +0000

[...] 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 [...]

By: reallygonecat

reallygonecat — Tue, 24 Jul 2007 18:26:46 +0000

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!

By: Adam W.

Adam W. — Tue, 24 Jul 2007 14:12:20 +0000

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.

By: david

david — Tue, 24 Jul 2007 14:05:38 +0000

how much force does this produce? can you strap it to a toy car?

By: Mic Edwards

Mic Edwards — Tue, 24 Jul 2007 12:13:50 +0000

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

By: doug l

doug l — Tue, 24 Jul 2007 12:01:53 +0000

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.

By: Eustace

Eustace — Tue, 24 Jul 2007 03:59:50 +0000

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.

By: Another Kevin

Another Kevin — Tue, 24 Jul 2007 02:18:42 +0000

@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.

By: chris

chris — Mon, 23 Jul 2007 23:02:08 +0000

here’s the wikipedia page on pulse jets

the german V2 buzz bomb was a pulse jet….

http://en.wikipedia.org/wiki/Pulse_jet

By: Brian Cantoni

Brian Cantoni — Mon, 16 Jul 2007 06:29:08 +0000

Congratulations on your 1-year anniversary. I love the weekly videos!

By: Jake L.

Jake L. — Sun, 15 Jul 2007 22:20:24 +0000

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.

By: cisc

cisc — Fri, 13 Jul 2007 22:30:23 +0000

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.