Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Fri, 13 Aug 2010 14:43:29 -0400
Message-ID: <redirect-4429890@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=64.12.206.42; envelope-from=RWolf99@aol.com
Subject: Re: Prop Balancing
MIME-Version: 1.0
From: rwolf99@aol.com
Content-Type: multipart/alternative; 
 boundary="--------MB_8CD092D8884C860_FCC_3D51_webmail-d021.sysops.aol.com"


----------MB_8CD092D8884C860_FCC_3D51_webmail-d021.sysops.aol.com
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="us-ascii"


My original posting on this subject was slightly in error.  Everyone else'=
s postings made me remember.  (It was ten years ago, by the way...)

1)  Yes, a mark is placed on the back of one propeller blade.  A piece of=
 reflective tape, as I recall.

2)  An electronic gizmo is temporarily affixed to the cowling.  Don't reca=
ll how -- tape or something.

3)  An RPM input is provided to the gizmo.

4)  The electronic gizmo measures acceleration (vibration).  The gizmo has=
 an optical sensor which detects when the reflective tape on the back side=
 of the prop goes by.  The RPM signal lets the gizmo figure out how many=
 degrees to attach the weights.

5)  I was wrong when I said that the screws holding on the spinner are cha=
nged.  What he really did was affix a screw and washer and self-locking nu=
t to the spinner backing plate.  If the gizmo said he needed 1.2 grams at=
 90 degrees past the reflectively taped blade, then he went into his box=
 of parts and found a screw and washer and nut whose combined weights adde=
d up to what was needed.  Yup, boxes of washers in 0.1 gram increments

- Rob Wolf


----------MB_8CD092D8884C860_FCC_3D51_webmail-d021.sysops.aol.com
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="us-ascii"

<font color=3D'black' size=3D'2' face=3D'arial'>
<div>My original posting on this subject was slightly in error.&nbsp; Ever=
yone else's postings made me remember.&nbsp; (It was ten years ago, by the=
 way...)</div>


<div>&nbsp;</div>


<div>1)&nbsp; Yes, a mark is placed on the back of one propeller blade.&nb=
sp; A piece of reflective tape, as I recall.</div>


<div>&nbsp;</div>


<div>2)&nbsp; An electronic gizmo is temporarily affixed to the cowling.&n=
bsp; Don't recall how -- tape or something.</div>


<div>&nbsp;</div>


<div>3)&nbsp; An RPM input is provided to the gizmo.</div>


<div>&nbsp;</div>


<div>4)&nbsp; The electronic gizmo measures acceleration (vibration).&nbsp=
; The gizmo has an optical sensor which detects when the reflective tape=
 on the back side of the prop goes by.&nbsp; The RPM signal lets the gizmo=
 figure out how many degrees to attach the weights.</div>


<div><br>
5)&nbsp; I was wrong when I said that the screws holding on the spinner ar=
e changed.&nbsp; What he really did was affix a screw and washer and self-=
locking nut to the spinner backing plate.&nbsp; If the gizmo said he neede=
d 1.2 grams at 90 degrees past the reflectively taped blade, then he went=
 into his box of parts and found a screw and washer and nut whose combined=
 weights added up to what was needed.&nbsp; Yup, boxes of washers in 0.1=
 gram increments</div>


<div>&nbsp;</div>


<div>- Rob Wolf<br>
</div>


<div style=3D"CLEAR: both"></div>
</font>

----------MB_8CD092D8884C860_FCC_3D51_webmail-d021.sysops.aol.com--