X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm29.access.bullet.mail.mud.yahoo.com ([66.94.237.94] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with SMTP id 4990118 for flyrotary@lancaironline.net; Fri, 20 May 2011 20:44:38 -0400 Received-SPF: softfail receiver=logan.com; client-ip=66.94.237.94; envelope-from=echristley@nc.rr.com Received: from [66.94.237.198] by nm29.access.bullet.mail.mud.yahoo.com with NNFMP; 21 May 2011 00:44:02 -0000 Received: from [66.94.237.103] by tm9.access.bullet.mail.mud.yahoo.com with NNFMP; 21 May 2011 00:44:02 -0000 Received: from [127.0.0.1] by omp1008.access.mail.mud.yahoo.com with NNFMP; 21 May 2011 00:44:02 -0000 X-Yahoo-Newman-Id: 492802.97821.bm@omp1008.access.mail.mud.yahoo.com Received: (qmail 79400 invoked from network); 21 May 2011 00:44:02 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1305938642; bh=/pnPNGXKpGru7/uarbtDv4231urUWRLYUM4nTY7p9f0=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=r4TAPX+1dqvolz0ncSkNxhbkbty3Fn9sIkwuyyawLaUjS3XuH5leJcY8TW8QsIeAxkYVb/jToOAVGUguyp0vzuZrW81zYUwZ33Lq8Wu+04TPU5nFQjMZMY8zkRvCUgSPoQTGBxQAQbY3ddz6mw7bux196ZbyMjXLf+Zm1mNQ/HY= Received: from [192.168.1.2] (echristley@65.190.53.180 with plain) by smtp108.sbc.mail.mud.yahoo.com with SMTP; 20 May 2011 17:44:02 -0700 PDT X-Yahoo-SMTP: 40RP3pGswBDvPav1a.I8eMv.KS8bdgWBnCloVoKaow-- X-YMail-OSG: VV5wVCkVM1n7reZfYd_mefmD3tfZjBiR1Rf8HFXFZvJa5Em Qw2Wy7LLFldKyKiHJfK1EDtABGmOT12ZBmsX1vDPviaShrsDR3CYj31nfS7L qy.z6TVitLRfl.JJ.NJkZJj3lFVFjrpy8AopLrt4hMFwkUEXquSZ0gXUMYBh B94RqgXkO1SESs44F1S9ice_P1tKfIwSqKm2sD1BWiHNMdzWe1yzb7x1JWbP sKT8ysA4HMMguVE9UmAamG0XzkT10neM0Kq6gpvZ1xDma7KUoNMiz6B_HhFK G_xQQJJ2ii4NOTptLqbCAkaVOQdLFlgEx20YmD8s21ouPBtzZSw-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <4DD70ACC.5090401@nc.rr.com> Date: Fri, 20 May 2011 20:43:56 -0400 From: Ernest Christley Reply-To: echristley@att.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Blower experiment: FAIL References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 05/20/2011 07:35 PM, H & J Johnson wrote: > So your thinking that the centrifugal forces are what sheared the rivets? It's pretty crazy how high the forces spikes could be from an unblanced fan. I've not see one yet that was just built and installed w/out being balanced and lived for any period of time. That kind of stuff fails spectacularly, once it starts to go you couldn't stop it fast enough to stop it from exploding. Can't argue one way or the other. All I know is that it came apart completely, and I wouldn't trust another constructed that way to last any longer. > As far as cnc'ing one, sure that can be arranged. Are we talking from billet or a casting or..? Material? Would a cast object be able to hold together? I was thinking that with a CNC, a machined billet one-off would be the easiest route.