From owner-freebsd-hardware Wed Jun 21 17: 2:58 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from finch-post-12.mail.demon.net (finch-post-12.mail.demon.net [194.217.242.41]) by hub.freebsd.org (Postfix) with ESMTP id E78D537C0D3 for ; Wed, 21 Jun 2000 17:02:54 -0700 (PDT) (envelope-from dmlb@ragnet.demon.co.uk) Received: from ragnet.demon.co.uk ([158.152.46.40]) by finch-post-12.mail.demon.net with esmtp (Exim 2.12 #1) id 134uSK-000HRT-0C; Thu, 22 Jun 2000 00:02:52 +0000 Received: from dmlb by ragnet.demon.co.uk with local (Exim 3.03 #1) id 134sjx-0006RB-00; Wed, 21 Jun 2000 23:12:57 +0100 Content-Length: 1270 Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <4.1.20000621233928.026e05c0@mail.rz.fh-wilhelmshaven.de> Date: Wed, 21 Jun 2000 23:12:57 +0100 (BST) From: Duncan Barclay To: Olaf Hoyer Subject: Re: Hardware in space? Cc: Brian Handy , freebsd-hardware@FreeBSD.ORG Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi all, > > 2) Which computing power will be needed? > If the power of a 486 will suffice, there should be no need for special > cooling, since a run of, say 15 minutes won't overheat the chip. > > 3) Is it really necessary to have air in? > (Except from cooling purposes or movement maker for HDDs) > > 4) For thermal insulation, is it possible to use something like styrofoam > around the computing parts? (Or sometimes for housebuilding purposes there > is similar foam for insulation, that you can "spray" from a can) > > 5) Real problem: Acceleration. If I got you right, we talk about some > launch phase of some minutes, then a ~5 minute picture shooting, and then a > landing and perhaps some notification via GPS where to pick up the parts. Heat could the the main problem. Depending on how high you are going up, the assumption that an air cooled device will be cooled fails...There is no air! Devices that are designed to be cooled by convection may over heat. Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@ragnet.demon.co.uk | the alcoholics, and the permanently stoned. ________________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message