X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: LML Date: Sun, 06 Dec 2009 12:32:22 -0500 Message-ID: X-Original-Return-Path: Received: from QMTA01.westchester.pa.mail.comcast.net ([76.96.62.16] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4003780 for lml@lancaironline.net; Sat, 05 Dec 2009 08:24:18 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.16; envelope-from=mjrav@comcast.net Received: from OMTA02.westchester.pa.mail.comcast.net ([76.96.62.19]) by QMTA01.westchester.pa.mail.comcast.net with comcast id DR0f1d0080QuhwU51RP5Dz; Sat, 05 Dec 2009 13:23:05 +0000 Received: from sz0110.wc.mail.comcast.net ([76.96.58.170]) by OMTA02.westchester.pa.mail.comcast.net with comcast id DRPk1d0043gN07g3NRPke2; Sat, 05 Dec 2009 13:23:44 +0000 X-Original-Date: Sat, 5 Dec 2009 13:23:44 +0000 (UTC) From: mjrav@comcast.net X-Original-To: Lancair Mailing List X-Original-Message-ID: <1496352808.11765281260019424124.JavaMail.root@sz0110a.westchester.pa.mail.comcast.net> In-Reply-To: <2106880602.11763221260018936714.JavaMail.root@sz0110a.westchester.pa.mail.comcast.net> Subject: Re: [LML] Flutter and nose wheel shimmy MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_593076_1016755828.1260019424123" X-Originating-IP: [71.234.42.4] X-Mailer: Zimbra 5.0.18_GA_3076.RHEL5_64 (ZimbraWebClient - IE6 (Win)/5.0.18_GA_3076.RHEL5_64) ------=_Part_593076_1016755828.1260019424123 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Interesting and sounds like a good idea.=20 The wheel assembly itself is also behind the center of rotation (the strut)= because of the castor of the wheel mount.=20 And I think shimmy is generally driven by wheel loads rather than aerodynam= ic ones.=C2=A0 That does not mean that ballancing all components can't help= .=20 It's not hard to imagine that adding mass to whatever wiggles may cause it = to get worse.=20 Mark Ravinski=20 360=20 ----- Original Message -----=20 From: "Pete Sinclair" =20 To: lml=20 Sent: Friday, December 4, 2009 4:28:30 PM GMT -05:00 US/Canada Eastern=20 Subject: [LML] Flutter and nose wheel shimmy=20 So if we balance ailerons and elevators, why not balance the nose gear fair= ing by adding weight in the front until it is neutrally balanced around the= axle? =C2=A0Would this not help reduce nose gear "flutter"? =C2=A0I unders= tand that the real center of vibration of the nose gear is around the strut= axis, but balancing the wheel pant would at least bring the center of bala= nce farther toward this axis.=20 Comments?=20 Pete=20 ------=_Part_593076_1016755828.1260019424123 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit

Interesting and sounds like a good idea.

The wheel assembly itself is also behind the center of rotation (the strut) because of the castor of the wheel mount.

And I think shimmy is generally driven by wheel loads rather than aerodynamic ones. That does not mean that ballancing all components can't help.

It's not hard to imagine that adding mass to whatever wiggles may cause it to get worse.

Mark Ravinski

360

----- Original Message -----
From: "Pete Sinclair" <pete@leapfrogventures.com>
To: lml
Sent: Friday, December 4, 2009 4:28:30 PM GMT -05:00 US/Canada Eastern
Subject: [LML] Flutter and nose wheel shimmy

So if we balance ailerons and elevators, why not balance the nose gear fairing by adding weight in the front until it is neutrally balanced around the axle? Would this not help reduce nose gear "flutter"? I understand that the real center of vibration of the nose gear is around the strut axis, but balancing the wheel pant would at least bring the center of balance farther toward this axis.

Comments?

Pete

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