[AR] Re: "How Hard Can It Be" rocket episode
- From: <johndom@xxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Wed, 20 Nov 2013 22:56:55 +0100
Thin flexible multilayer PCBs are available since the seventies. Applied in
most NATO jets circuitry. Allow for 90° bends. Mylar I think. Not sure about
180° folding them (from international aerospace exhibitions visits, like
Farnborough and Le Bourget).
So I wonder if flex ones crack too.
jd
_____
Van: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
Namens George Herbert
Verzonden: woensdag 20 november 2013 22:17
Aan: arocket@xxxxxxxxxxxxx
Onderwerp: [AR] Re: "How Hard Can It Be" rocket episode
I'm more worried about boards cracking, solder joints between chips / SMT
components and the board cracking, etc.
On Wed, Nov 20, 2013 at 1:13 PM, Keith Henson <hkeithhenson@xxxxxxxxx>
wrote:
> From: George Herbert <george.herbert@xxxxxxxxx>
snip
> Some of my lawn-dart style manned capsule landers kept G-loads to 10 Gs or
> less for the crew. That should be within tolerance bands for electronics,
> though one needs to look at the specific equipment.
Back in the early 70s part of the testing protocol was to spin bonded
chips at 10,000 g upside down to test that the bonding wires didn't
come off.
--
-george william herbert
george.herbert@xxxxxxxxx
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