Throatless rocket engine
John Carmack is working a potentially disruptive technology: A throatless rocket engine. Its made from plain aluminum pipes with few machined fittings. Carmack says: “The great thing about these engines is that it only takes me two nights to machine the parts, so we can test two engines a week if necessary.” It scales too: “If this line of tube engine development works out, we can make a 5,000 lbf engine with very little more effort than the test engine. [via] Link.
Perry writes “I invented this new type of cutting tool and have been having a blast with it. I want to see the cool things people can make and mod with them. The MP series cuts metal foils and plastic sheets. The other lines work great on paper, photo and vellums. If you make some cool stuff and I’d like to konw about it”. Clever, it’s a blade, inside a marker.
Wow, I rarely use Excel, but here’s a good reason to keep it around- If you have Excel 2003 and use the social bookmarking tool Del.icio.us, you can backup your bookmarks in Excel.
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