X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 24 Mar 2014 22:06:01 -0400 Message-ID: X-Original-Return-Path: Received: from argon.lunarpages.com ([216.97.227.30] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6794884 for lml@lancaironline.net; Mon, 24 Mar 2014 21:58:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.97.227.30; envelope-from=thorn@starflight.aero Received: from 65-128-87-216.hlrn.qwest.net ([65.128.87.216]:62150 helo=VAlien2) by argon.lunarpages.com with esmtpa (Exim 4.77) (envelope-from ) id 1WSGcw-0003HV-Kb for lml@lancaironline.net; Mon, 24 Mar 2014 18:58:07 -0700 From: "Valin & Allyson Thorn" X-Original-To: X-Original-Cc: "Valin & Allyson Thorn" Subject: Hartzell Prop Governor Low RPM Capability X-Original-Date: Mon, 24 Mar 2014 19:58:03 -0600 X-Original-Message-ID: <007c01cf47cd$a8ab9a80$fa02cf80$@starflight.aero> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_007D_01CF479B.5E1437C0" X-Mailer: Microsoft Outlook 15.0 Content-Language: en-us Thread-Index: Ac9HzGabFSpI/7ZvRkirGgaj3pkx0g== X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - argon.lunarpages.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - starflight.aero X-Get-Message-Sender-Via: argon.lunarpages.com: authenticated_id: thorn@starflight.aero This is a multipart message in MIME format. ------=_NextPart_000_007D_01CF479B.5E1437C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I was surprised to learn recently that the Hartzell propeller governor (S Series) cannot adjust the blade pitch with an engine speed below about 1800 rpm. Seems like that could be a problem in an engine out glide scenario, where the prop stays at flat pitch, high drag. I talked to a guy at Hartzell Technical Support and he confirmed that's how their S series governors work. He said it's not a problem and that they are on all the Cirrus airplanes. But, with the Cirrus' single lever control linkage, I don't think Cirrus pilots can adjust the blade pitch in an engine out scenario anyway. For the Legacy flyers out there flying with the Hartzell governor, when you're at best glide speed of 120 KIAS, are you able to get enough engine rpm to get maximum blade pitch (low drag) or not.? Thanks, Valin Thorn Legacy Project Boulder, Colorado USA ------=_NextPart_000_007D_01CF479B.5E1437C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I was surprised to learn recently = that the Hartzell propeller governor (S = Series) cannot adjust the blade pitch with an engine speed below about = 1800 rpm.  Seems like that = could be a problem in an engine out glide scenario, where the prop stays = at flat pitch, high drag.

 

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

 

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

 

Thanks,

 

Valin Thorn

Legacy = Project

Boulder, Colorado = USA

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