X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 18 Jun 2013 12:32:55 -0400 Message-ID: X-Original-Return-Path: Received: from vms173015pub.verizon.net ([206.46.173.15] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6330933 for lml@lancaironline.net; Tue, 18 Jun 2013 11:06:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.15; envelope-from=n5zq@verizon.net Received: from BillHP ([unknown] [173.72.172.118]) by vms173015.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0MOL00B15GL7AF10@vms173015.mailsrvcs.net> for lml@lancaironline.net; Tue, 18 Jun 2013 10:05:32 -0500 (CDT) X-Original-Message-id: <722A9F125E944EB18C6E2B7BA8B3A51F@BillHP> From: "Bill Harrelson" X-Original-To: References: In-reply-to: Subject: Re: [LML] Propeller choice for Lancair 320 X-Original-Date: Tue, 18 Jun 2013 11:05:30 -0400 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0158_01CE6C13.BEB870A0" X-Priority: 3 X-MSMail-priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3538.513 X-MIMEOLE: Produced By Microsoft MimeOLE V15.4.3538.513 This is a multi-part message in MIME format. ------=_NextPart_000_0158_01CE6C13.BEB870A0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Nick, I have an MT two blade on our 320. We=E2=80=99ve got just under 2,200 = hours on it with no cracks in the blade or spinner parts. Our = performance with the MT seems to be comparable to our friends with = Hartzell props. I=E2=80=99m quite happy with the MT although = I=E2=80=99m not sure that your information about it being lower cost is = correct. You can purchase various blade lengths for either the Hartzell = or the MT.=20 Bill Harrelson N5ZQ 320 2,150 hrs N6ZQ IV 300 hrs From: Nick Long=20 Sent: Tuesday, June 18, 2013 10:51 AM To: lml@lancaironline.net=20 Subject: [LML] Propeller choice for Lancair 320 Hello Everyone, With the discussion on MT backplates, this my be a good time to = introduce myself and ask for the group=E2=80=99s opinion on something. I have a Lancair 320 and I need a new prop. There=E2=80=99s no point = beating about the bush: the reason is that I did a bad landing and had a = prop strike. The engine is a Lycoming IO-320-B1A (ex Twin Comanche) and the current = propeller is a Hartzell 2 blade. It seems that some people are using the = MT 3 blade instead, so I want to consider this as an alternative. As far as I understand it, the MT prop is a little lower cost, it is = significantly lower weight, and it is 3 inches smaller diameter. On the = face of it, all these things sound good. On the other hand, I have had = people telling me that they always seem to need new blades at overhaul = time =E2=80=93 they develop cracks at the blade root. What I = haven=E2=80=99t had anyone tell me is what the performance difference = might be. In theory, a smaller diameter means less thrust, but the = difference could easily be outweighed by design differences. What does the group think? Has anyone experience of switching from one = to the other? Thanks, Nick Long From: Silvio Novelli=20 Sent: Tuesday, June 18, 2013 1:37 PM To: lml@lancaironline.net=20 Subject: [LML] Re: MT Spinner backing plate No problems with mine, three blades Lyc IO 320, 100 hours. Silvio Novelli Lancair 320 PP-XSN +55 (14) 9614-3129 On 18 Jun 2013,w 25, at 8:45 AM, Dan Ballin wrote: Just wondering if anyone else has had this issue. I noticed cracks (3 of them) in the spinner backing plate of my = counterweighted MT prop for my Legacy. I have been keeping an eye on it = because Ralph Love has had two plates crack on him. I have had the prop = about a year, it was dynamically balanced. Of interest both Ralph and I = have Performance engines that have been inspected and altered ie bad = parts out good parts in. Dan LEG2 N386DM ------=_NextPart_000_0158_01CE6C13.BEB870A0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Nick,
 
I have an MT two blade on our 320. = We=E2=80=99ve got just=20 under 2,200 hours on it with no cracks in the blade or spinner parts. = Our=20 performance with the MT seems to be comparable to our friends with = Hartzell=20 props.  I=E2=80=99m quite happy with the MT although I=E2=80=99m = not sure that your=20 information about it being lower cost is correct. You can purchase = various blade=20 lengths for either the Hartzell or the MT.
 
Bill Harrelson
N5ZQ 320 2,150 hrs
N6ZQ  IV 300 hrs
 
 
 
From: Nick Long
Sent: Tuesday, June 18, 2013 10:51 AM
Subject: [LML] Propeller choice for Lancair = 320
 
Hello Everyone,
 
With the discussion on MT backplates, this my be a good time to = introduce=20 myself and ask for the group=E2=80=99s opinion on something.
 
I have a Lancair 320 and I need a new  prop. There=E2=80=99s = no point beating=20 about the bush: the reason is that I did a bad landing and had a prop=20 strike.
 
The engine is a Lycoming IO-320-B1A (ex Twin Comanche) and the = current=20 propeller is a Hartzell 2 blade. It seems that some people are using the = MT 3=20 blade instead, so I want to consider this as an alternative.
 
As far as I understand it, the MT prop is a little lower cost, it = is=20 significantly lower weight, and it is 3 inches smaller diameter. On the = face of=20 it, all these things sound good. On the other hand, I have had people = telling me=20 that they always seem to need new blades at overhaul time =E2=80=93 they = develop cracks=20 at the blade root. What I haven=E2=80=99t had anyone tell me is what the = performance=20 difference might be. In theory, a smaller diameter means less thrust, = but the=20 difference could easily be outweighed by design differences.
 
What does the group think? Has anyone experience of switching from = one to=20 the other?
 
Thanks,
 
Nick Long
 
 
Sent: Tuesday, June 18, 2013 1:37 PM
Subject: [LML] Re: MT Spinner backing = plate
 
No=20 problems with mine, three blades Lyc IO 320, 100 hours.

     Silvio = Novelli
Lancair 320=20 PP-XSN
+55 (14)=20 9614-3129
 

 
On 18  Jun 2013,w 25, at 8:45 AM, Dan Ballin wrote:
 
Just wondering if anyone else has had this issue.
I = noticed cracks=20 (3 of them) in the spinner backing plate of my counterweighted MT prop = for my=20 Legacy.  I have been keeping an eye on it because Ralph Love has = had two=20 plates crack on him.  I have had the prop about a year, it was = dynamically=20 balanced. Of interest both Ralph and I have Performance engines that = have been=20 inspected and altered ie bad parts out good parts=20 in.

Dan
LEG2  N386DM
 
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