X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 Mar 2014 11:45:22 -0400 Message-ID: X-Original-Return-Path: Received: from mail-oa0-f41.google.com ([209.85.219.41] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6795625 for lml@lancaironline.net; Tue, 25 Mar 2014 09:52:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.41; envelope-from=bbreen@cableone.net Received: by mail-oa0-f41.google.com with SMTP id j17so596511oag.28 for ; Tue, 25 Mar 2014 06:51:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:references:from:content-type:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=BLmaxcbpbL9MVI8q4YLlQAXcW0P0k/BijjcEFwnqiR4=; b=Yg+B0SpX4C8HjRUtoTbTwMKwuw2u6VRM9RiV8JNE6o/OeD//hzB/F7HOJTAYKMmXPh K6/YRB0M/llvrLQqtdb7iJ6m3vi9YlI1sT6GfJ2/n66gkYxv9zBMG1Am7uCosPc3aOnz y+yYFL5mDkz6jbIcKlg+worJxuO1caOTMxqQv7ca0tnJjz+MqmWh8q3Vfga9/RwqKsEG mplgOaymngx2MDLUKPMKputBCHAY7VG6Aa4qxlWkyUkhFqx+fc+eTIz6tnZ2NIP2bWUF 3P9Ic4u2/NJrn7VhX/ya1hQq57uKf9gyifls6o+IT/IY5VDVz6jnbTMiOk2o6H1cr6S6 D8MA== X-Gm-Message-State: ALoCoQkvhcVxmJDaUYyG6ar1qi2aR2NVJW92lLBFdh0cz/1rRcLyfFoN8fikWuXpBU8+/6nmieP7 X-Received: by 10.182.188.73 with SMTP id fy9mr1285633obc.68.1395755488851; Tue, 25 Mar 2014 06:51:28 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.106] ([96.19.130.180]) by mx.google.com with ESMTPSA id ec8sm30490521obb.18.2014.03.25.06.51.27 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 25 Mar 2014 06:51:27 -0700 (PDT) Subject: Re: [LML] Hartzell Prop Governor Low RPM Capability References: From: Berni Breen Content-Type: multipart/alternative; boundary=Apple-Mail-6A9FA21E-A24D-47DB-8360-4A68FAEB104F X-Mailer: iPhone Mail (11B554a) In-Reply-To: X-Original-Message-Id: X-Original-Date: Tue, 25 Mar 2014 08:51:24 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-6A9FA21E-A24D-47DB-8360-4A68FAEB104F Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable This issue was a topic of discussion amongst some of the attendees at the Co= ntinental/Lancair maintenance clinic this past weekend. While I do have a H= artzell prop and governor on my Lancair Legacy, I am not sure if I have the S= series governor you refer to. I have used 2000 RPM as my setting to check m= y prop during run-up as that is what I was advised to do when I bought my fl= ying Legacy. Admittedly, I had not been concerned about the engine out rami= fications of such a high required setting. As such I went out yesterday to c= heck for the lowest possible RPM setting for prop control occur. I found th= at I had to go to 1900 RPM to have control on the ground. I have no reason t= o believe it will be any better in the air but I will check that out on my n= ext simulated engine out opportunity. Clearly this issue is genuine cause for some level of concern...not sure how= much just yet. Berni Breen Sent from my iPhone > On Mar 24, 2014, at 9:06 PM, "Valin & Allyson Thorn" wrote: >=20 > I was surprised to learn recently that the Hartzell propeller governor (S S= eries) cannot adjust the blade pitch with an engine speed below about 1800 r= pm. Seems like that could be a problem in an engine out glide scenario, whe= re the prop stays at flat pitch, high drag. > =20 > I talked to a guy at Hartzell Technical Support and he confirmed that=E2=80= =99s how their S series governors work. He said it=E2=80=99s not a problem a= nd that they are on all the Cirrus airplanes. But, with the Cirrus=E2=80=99= single lever control linkage, I don=E2=80=99t think Cirrus pilots can adjus= t the blade pitch in an engine out scenario anyway. > =20 > For the Legacy flyers out there flying with the Hartzell governor, when yo= u=E2=80=99re at best glide speed of 120 KIAS, are you able to get enough eng= ine rpm to get maximum blade pitch (low drag) or not=E2=80=A6? > =20 > Thanks, > =20 > Valin Thorn > Legacy Project > Boulder, Colorado USA --Apple-Mail-6A9FA21E-A24D-47DB-8360-4A68FAEB104F Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
This issue was a topic of discussion a= mongst some of the attendees at the Continental/Lancair maintenance clinic t= his past weekend.  While I do have a Hartzell prop and governor on my L= ancair Legacy, I am not sure if I have the S series governor you refer to. &= nbsp;I have used 2000 RPM as my setting to check my prop during run-up as th= at is what I was advised to do when I bought my flying Legacy.  Admitte= dly, I had not been concerned about the engine out ramifications of such a h= igh required setting.  As such I went out yesterday to check for the lo= west possible RPM setting for prop control occur.  I found that I had t= o go to 1900 RPM to have control on the ground.  I have no reason to be= lieve it will be any better in the air but I will check that out on my next s= imulated engine out opportunity.
Clearly this issue is genuine cau= se for some level of concern...not sure how much just yet.

Berni Bree= n
Sent from my iPhone

On Mar 24, 2014, at 9:06 PM, "= Valin & Allyson Thorn" <thor= n@starflight.aero> wrote:

=

I was su= rprised to learn recently that the Hartzell pr= opeller governor (S Series) cannot adjust the blade pitch with an engine spe= ed below about 1800 rpm.  Seems= like that could be a problem in an engine out glide scenario, where the pro= p stays at flat pitch, high drag.

 

I talked to a guy at Hartzell Technical Support and he confirmed that=E2=80=99s how their S series gove= rnors work.  He said it=E2=80=99= s not a problem and that they are on all the Cirrus airplanes.  But, with the Cirrus=E2=80=99 single lever c= ontrol linkage, I don=E2=80=99t think Cirrus pilots can adjust the blade pit= ch in an engine out scenario anyway.

 <= /o:p>

For the Legacy flyers out there flying with the Hartzell governor, when you=E2=80=99re at best glide s= peed of 120 KIAS, are you able to get enough engine rpm to get maximum blade= pitch (low drag) or not=E2=80=A6?

 

Thanks,

 

Valin Thorn

Legacy Project

Boulder, Colorado USA

= --Apple-Mail-6A9FA21E-A24D-47DB-8360-4A68FAEB104F--