X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-db01.mx.aol.com ([205.188.91.95] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5598149 for flyrotary@lancaironline.net; Wed, 13 Jun 2012 18:05:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.91.95; envelope-from=ARGOLDMAN@aol.com Received: from mtaomg-da05.r1000.mx.aol.com (mtaomg-da05.r1000.mx.aol.com [172.29.51.141]) by imr-db01.mx.aol.com (8.14.1/8.14.1) with ESMTP id q5DM4jaD012984 for ; Wed, 13 Jun 2012 18:04:45 -0400 Received: from core-dsb002c.r1000.mail.aol.com (core-dsb002.r1000.mail.aol.com [172.29.253.5]) by mtaomg-da05.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id B2034E00008B for ; Wed, 13 Jun 2012 18:04:45 -0400 (EDT) From: ARGOLDMAN@aol.com Message-ID: <1645b.39e221d5.3d0a687d@aol.com> Date: Wed, 13 Jun 2012 18:04:45 -0400 (EDT) Subject: Re: [FlyRotary] IVO Prop controls To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_1645b.39e221d5.3d0a687d_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [24.14.64.174] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1339625085; bh=+ZbieE3IfLFnUYDjT6t0aJ5cUUH/BMXDUbzfPoBMAuc=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=dC4zHs37lcHVrRRBbgKsfZHo1zzljTYz+KYIBkQ0BCNW4Wc6lZbuzxXFJWykUsPHH sacV9WlCm64AoA7TQJmWa7wBwJ53CGobRy0MKjWbdhPe1nKje+5aRvyKZ9Y3G5bAz1 BLC8Rjdb/1OxRWxO1c+n0JQmi9/SljHd+W0fnLPo= X-AOL-SCOLL-SCORE: 0:2:388646432:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d338d4fd90e7d1028 --part1_1645b.39e221d5.3d0a687d_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit The IVO has a geared motor that drives a screw. The screw drives a device which goes fore and aft in the hub twisting the blades. The physical limits are placed on the device (fore and aft) via a series of washers with a plastic one which compresses for mechanical safety. The unit only draws current when the pitch is changed. Otherwise it is static and the prop stays in the last pitch setting. Failure mode is that the prop will not change pitch-- it will not flatten out like most standard oil press C/S props or increase pitch. Rich In a message dated 6/13/2012 4:15:56 P.M. Central Daylight Time, Lehanover@aol.com writes: Why in the world would IVO use a device that is designed to fail critical flight gear in the case of improper control manipulation when they don't have to? Isn't this the classical and proper application for a polyfuse? Polyfuses are used in power windows for this exact reason. You're kids can pull on that switch all day without damaging the window motor. I'm thinking of the case where a switch gets shorted (like my belt sander's switch is right now...the power cord is serving as a temp fix until I get time), or someone accidentally leans something against the switch. Why does the motor draw current after the pitch has been changed? Lynn E. Hanover --part1_1645b.39e221d5.3d0a687d_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
The IVO has a geared motor that drives a screw. The screw drives = a=20 device which goes fore and aft in the hub twisting the blades. The physical= =20 limits are placed on the device (fore and aft) via a series of washers with= a=20 plastic one which compresses for mechanical safety. The unit only draws cur= rent=20 when the pitch is changed. Otherwise it is static and the prop stays in the= last=20 pitch setting.
 
Failure mode is that the prop will not change pitch-- it will  no= t=20 flatten out like most standard oil press C/S props or increase pitch.
 
Rich
 
In a message dated 6/13/2012 4:15:56 P.M. Central Daylight Time,=20 Lehanover@aol.com writes:
=
Why in the world would IVO use a device that is desig= ned to=20 fail critical flight gear in the case of improper control
manipulation= when=20 they don't have to? Isn't this the classical and proper application for a= =20 polyfuse? Polyfuses are
used in power windows for this exact reason. Y= ou're=20 kids can pull on that switch all day without damaging the window
motor= . I'm=20 thinking of the case where a switch gets shorted (like my belt sander's s= witch=20 is right now...the power cord
is serving as a temp fix until I get tim= e),=20 or someone accidentally leans something against the switch.
Why does the motor draw current after the pitch has been changed?
 
Lynn E.=20 Hanover 
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