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Jun 11, 2009, 12:33 PM
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Biggest etch ever


Going over the Walmart specials again, a spin copter would take buying lots of toy copters & finding out if any have enough power. There's no other way. $100 was the price of finding out 12mm brushless motors R too heavy to land.

The Havoc Cyclone looks like it might work if chopped up. Lift junk hardware first. Etch a single sided board with no voltage regulator. Single sided is lighter than double sided. That's July's budget.

Our double sided boards cost 2x as much & weigh 2x as much because they need 2x the etching board & the vias R too big. Their only advantage is the form factor & the wow factor for our Iranian readers.

SSME nugget 4 U

The answer is yes, the SSME has 1000 tiny tubes on the inside of the nozzle, not the hatbands U see on all the media photos. The outside rings R called hatbands & just keep it from falling apart. Didn't know this, so didn't get a high resolution photo of the tubes. Only got a wide angle photo of the nozzle.

The tubes R 1/4" in diameter on the aft end & shrink to pin size as they approach the forward end. Liquid hydrogen flows from the aft end to the forward end to keep the nozzle from melting. The tubes R braze welded to the nozzle wall. Finding leaks is real hard.
Last edited by Jack Crossfire; Jun 11, 2009 at 12:49 PM.
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