X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 16 Aug 2011 07:47:25 -0400 Message-ID: X-Original-Return-Path: Received: from raven.ravenwebhosting.com ([72.9.254.67] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5093374 for lml@lancaironline.net; Tue, 16 Aug 2011 00:39:46 -0400 Received-SPF: none receiver=logan.com; client-ip=72.9.254.67; envelope-from=paul@tbm700.com Received: from s01060017ee00b6c0.cg.shawcable.net ([174.0.115.173]:55767 helo=[192.168.15.11]) by raven.ravenwebhosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1QtBQm-0000pI-R4 for lml@lancaironline.net; Tue, 16 Aug 2011 00:39:13 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-53-154886166 Subject: Re: [LML] Re: Prop Balancing: Legacy X-Original-Date: Tue, 16 Aug 2011 00:38:55 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <925E8117-2B6C-4712-987E-BF67E875E01F@tbm700.com> X-Mailer: Apple Mail (2.1084) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - raven.ravenwebhosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail-53-154886166 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Comments on your comments: On 2011-08-15, at 11:20 PM, Kent wrote: > But a FYI about the Dynavibe, when I looked at them couple years ago, = their vibration pickup had its cable integrated in one piece with the = MEMS sensor. If misfortune caused a cable to burn after touching an = exhaust pipe, one would have to send the whole cable and sensor back for = repair or replacement, which I was told was "several hundred dollars". > Dynavibe told me the sensor has not been returned for any failures. = The cable I think must be kept clear of exhaust and prop and doors and = should be tied down for the testing--just common sense. I did not see = any abnormal risk. > Another thing I wonder about, Dynavibe provides a calibration = certificate but only after paying additional cost. =20 > You think they would check each unit after assembly? Two channels is = also additional cost. =20 > The units are identical and meet the same standards out of the = factory--from OSH reps I spoke with 2011. > Hartzell has instructions for dynamic balance too. Hartzell does not = prohibit adjusting the shim static weights. Kent, I'm not an A&P or prop expert. However, I did reference the ACES = materials in my research, that material is referenced in some FAA = materials to use as a source for dynamic balance instructions. In that = reference, ACES states "WARNING Static balance weight attached to the = propeller hub by a certified propeller shop MUST NOT be removed." I = personally looked at those weights and understand them to be static = balance weights installed (in my case) by Hartzell factory and not = adjustable. I came away with an understanding that the only adjustable = dynamic weight change is to be installed elsewhere such as starter ring, = spinner backplate, spinner screws but not by adjusting the factory = static weights. I'd like your comments on this. >=20 > =20 > regards > Kent Felkins > Tulsa > =20 Paul Calgary/Legacy= --Apple-Mail-53-154886166 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

But a FYI about the Dynavibe, when I looked at them = couple years ago, their vibration pickup had its cable integrated in one = piece with the MEMS sensor. If misfortune caused = a cable to burn after touching an exhaust pipe, one would have to send = the whole cable and sensor back for repair or replacement, which I was = told was "several hundred dollars".
Dynavibe told me the sensor has not been returned for = any failures. The cable I think must be kept clear of exhaust and = prop and doors and should be tied down for the testing--just common = sense. I did not see any abnormal = risk.

Another = thing I wonder about, Dynavibe provides a calibration certificate = but only after paying additional = cost.
You = think they would check each unit after assembly? Two channels is also additional = cost. &nb= sp;
The units are identical and meet the same standards = out of the factory--from OSH reps I spoke with = 2011.

Hartzell has = instructions for dynamic balance too. Hartzell does not prohibit adjusting the shim static = weights.

Kent, I'm not an A&P or prop expert. = However, I did reference the ACES materials in my research, that = material is referenced in some FAA materials to use as a source for = dynamic balance instructions. In that reference, ACES states = "WARNING Static balance weight attached to the propeller hub by = a certified propeller shop MUST NOT be = removed." I personally looked at those weights and understand them = to be static balance weights installed (in my case) by Hartzell factory = and not adjustable. I came away with an understanding that the = only adjustable dynamic weight change is to be installed elsewhere such = as starter ring, spinner backplate, spinner screws but not by adjusting = the factory static weights. I'd like your comments on = this.

regards
Kent = Felkins
Tulsa

Paul

Calgar= y/Legacy

= --Apple-Mail-53-154886166--