X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 15 Oct 2012 11:59:48 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma04.mx.aol.com ([64.12.206.42] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTP id 5812042 for lml@lancaironline.net; Mon, 15 Oct 2012 10:04:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.42; envelope-from=Sky2high@aol.com Received: from mtaomg-db01.r1000.mx.aol.com (mtaomg-db01.r1000.mx.aol.com [172.29.51.199]) by imr-ma04.mx.aol.com (8.14.1/8.14.1) with ESMTP id q9FE48jF021085 for ; Mon, 15 Oct 2012 10:04:08 -0400 Received: from core-mta005a.r1000.mail.aol.com (core-mta005.r1000.mail.aol.com [172.29.234.145]) by mtaomg-db01.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id C1326E000088 for ; Mon, 15 Oct 2012 10:04:07 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <84ca.1328f293.3dad71d7@aol.com> X-Original-Date: Mon, 15 Oct 2012 10:04:07 -0400 (EDT) Subject: Re: [LML] Re: Torque X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_84ca.1328f293.3dad71d7_boundary" X-Mailer: AOL 9.7 sub 19 X-Originating-IP: [205.188.66.138] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:449871680:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33c7507c17d73700 --part1_84ca.1328f293.3dad71d7_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Chris, Your answer is much better than mine... The wing bolts, if tightened to max torque value would be crushing the web whether it is made of carbon or prepreg. I have been looking for the right number for years because gut-und-tight still leaves me uncomfortable. Grayhawk In a message dated 10/15/2012 6:58:55 A.M. Central Daylight Time, chris_zavatson@yahoo.com writes: Jim, et al, The torque values in the link provided looked to be very low for the bolt strength quoted (125 to 145 ksi). There was no source stated in the table. After some searching, I found these values to be nearly identical to a table found in AC43.13-1B. The only rub is that this particular table loaded the bolt to only 40,000 psi for the tension application and only 24,000 psi for the shear applications. Utilizing full bolt strength requires quite a bit more torque. For example the required torque for a 3/8" fine thread bolt in tension goes from 160-190 inlbs to 390 inlb to reach 90 ksi. The story does not end there however. There exist applications that should not be torqued to the rated value of the bolt. The materials being clamped may not be able to support the full clamping load of the bolt. For example, the 3/8" Hartzell propeller hub bolts, that also hold the spinner backplate, should not be torqued to 390 inlb. Hartzell limits the hub bolt torque to 264 inlb. Chris Zavatson N91CZ _http://www.n91cz.net/_ (http://www.n91cz.net/) From: Jim Nordin To: lml@lancaironline.net Sent: Wednesday, October 10, 2012 1:04 PM Subject: [LML] Torque http://www.hangtowneaa512.org/techdocs/torqueval.pdf -----Original Message----- From: Lancair Mailing List [mailto:_lml@lancaironline.net_ (mailto:lml@lancaironline.net) ] On Behalf Of peter Sokolowski Sent: Wednesday, October 10, 2012 2:46 PM To: _lml@lancaironline.net_ (mailto:lml@lancaironline.net) Subject: [LML] Torque Hi, I am just mounting the wings of my 360 MKII (finally) and want to use the right torque for the screws. I did not find a number in the manual and could not locate it in the LML too. Can someone please help me out ? Thanks in advance, Peter D-EPSO 360 MKII (hope to fly in December / January 2013.....) -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html -- For archives and unsub _http://mail.lancaironline.net:81/lists/lml/List.html_ (http://mail.lancaironline.net:81/lists/lml/List.html) -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_84ca.1328f293.3dad71d7_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Chris,
 
Your answer is much better than mine...  The wing bolts, if tight= ened=20 to max torque value would be crushing the web whether it is made of carbon = or=20 prepreg.  I have been looking for the right number for years because= =20 gut-und-tight still leaves me uncomfortable. 
 
Grayhawk
 
In a message dated 10/15/2012 6:58:55 A.M. Central Daylight Time,=20 chris_zavatson@yahoo.com writes:
=
Jim, et al,=
The torque values in the link provided looked to be= very=20 low for the bolt strength quoted (125 to 145 ksi).  There was n= o=20 source stated in the table.  After some searching, I found these=20 values to be nearly identical to a table found=20 in AC43.13-1B.  The only rub is t= hat=20 this particular table loaded the bolt to only 40,000 psi f= or=20 the tension application and only 24,000 psi for the shear=20 applications.  Utilizing full bolt strength requires quite a bit mor= e=20 torque.
For example the required torque for a 3/8" fine thr= ead=20 bolt in tension goes from 160-190 inlbs to 390 inlb to reach 90 ksi.=20   The story does not end there however. =20 There exist applications that should not be torqued to the rated val= ue of=20 the bolt.  The materials being clamped may not be able to support th= e=20 full clamping load of the bolt.  For example, the 3/8" Hartzell prop= eller=20 hub bolts, that also hold the spinner backplate, should not be torqued to= 390=20 inlb.  Hartzell limits the hub bolt torque to=20 264 inlb.   Chris Zavatson N91CZ http://www.n91cz.net/ 

From: Jim Nordin=20 <panelmaker@earthlink.net>
To: lml@lancaironline.net
<= SPAN=20 style=3D"FONT-WEIGHT: bold">Sent: Wednesday, October 10, 2012 = 1:04=20 PM
Subject: [LML]=20 Torque

http://www.hangtowneaa512.org/techdocs/torquev= al.pdf=20

-----Original Message-----
From: Lancair Mailing List [mailto:= lml@lancaironline.net] On Be= half Of=20 peter
Sokolowski
Sent: Wednesday, October 10, 2012 2:46 PM
To: <= A=20 title=3Dmailto:lml@lancaironline.net href=3D"mailto:lml@lancaironline.net= "=20 ymailto=3D"mailto:lml@lancaironline.net">lml@lancaironline.net
Sub= ject:=20 [LML] Torque

Hi,

I am just mounting the wings of my 360 MKI= I=20 (finally) and want to use the
right torque for the screws. I did not f= ind a=20 number in the manual and could
not locate it in the LML too.

C= an=20 someone please help me out ?

Thanks in advance,

Peter
D= -EPSO=20 360 MKII (hope to fly in December / January 2013.....)


--
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