X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 02 Nov 2009 15:32:41 -0500 Message-ID: X-Original-Return-Path: Received: from QMTA10.westchester.pa.mail.comcast.net ([76.96.62.17] verified) by logan.com (CommuniGate Pro SMTP 5.2.17) with ESMTP id 3913134 for lml@lancaironline.net; Mon, 02 Nov 2009 10:21:51 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.17; envelope-from=mjrav@comcast.net Received: from OMTA22.westchester.pa.mail.comcast.net ([76.96.62.73]) by QMTA10.westchester.pa.mail.comcast.net with comcast id 0EJZ1d00A1ap0As5AFMKYg; Mon, 02 Nov 2009 15:21:19 +0000 Received: from mjr ([66.30.31.94]) by OMTA22.westchester.pa.mail.comcast.net with comcast id 0FSi1d00C21qeES3iFSkSU; Mon, 02 Nov 2009 15:26:44 +0000 X-Original-Message-ID: <005b01ca5bd0$20e03450$5e1f1e42@mjr> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: unfeathering accumulator question X-Original-Date: Mon, 2 Nov 2009 10:21:19 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01CA5BA6.37E406B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1983 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1983 This is a multi-part message in MIME format. ------=_NextPart_000_0058_01CA5BA6.37E406B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Turbine types, I met a fellow yesterday who is building a Seawind with a 550 hp PT-6. = It is complete except for paint. He says he will not be able to unfeather the prop in flight if there is = no oil pressure. (engine not running) It seems I've read here on the LML that some turbines are equipped with = unfeathering accumulators. Can anyone enlighten me about that for a PT-6? Thanks, He really loved a ride in my 360. Mark Ravinski 1479 hrs ----- Original Message -----=20 From: marv@lancair.net=20 To: lml@lancaironline.net=20 Sent: Monday, November 02, 2009 7:51 AM Subject: [LML] Re: AOA Calibration Questions Posted for John Hafen : Gents: =20 Hopefully someone on the list knows way more about my AOA than I do. = Thanks in advance for your assistance. =20 Running through the AOA PRO II Calibration Check List, in the Cruise Configuration Calibration, the checklist says: =20 Zero G Maneuver for 1/2 second: YES =20 The next line says: =20 PTT Red Record Button PUSH/RELEASE =20 My question: Am I to assume that you push the Red PTT button during = the 1/2 second of Zero G Flight? After? When? =20 You also have to do some button pushing at 1.15 of Clean stall, and 1.15 of dirty/landing configuration stall. =20 Having not repeatedly stalled my IVP while looking closely at the = airspeed indicator, I admit I can=B9t say exactly what the clean and dirty = stall speeds are, although the numbers I have been able to glean are that an IVP = should have a clean and dirty stall speed of 80 and 75 KIAS respectively. =20 So to calibrate the AOA, I would be pushing the buttons at 92 and 87 = KIAS for clean and dirty. =20 Is there any reason to calibrate at higher speeds than 92 and 87? = Would you get an earlier warning of an impending stall? =20 Your advice and comments are very welcome. =20 Regards, =20 John Hafen IVP 413AJ < 200 hours [The AOA records the data at the release of the PTT button, so you can = press it when you start the maneuver and release it at the instant you = are satisfied that you are performing the required maneuver. = ] -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0058_01CA5BA6.37E406B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Turbine types,
I met a fellow yesterday who is = building a Seawind=20 with a 550 hp PT-6.  It is complete except for paint.
He says he will not be able to = unfeather the prop=20 in flight if there is no oil pressure.  (engine not = running)
It seems I've read here on the LML that = some=20 turbines are equipped with unfeathering accumulators.
Can anyone enlighten me about that for = a=20 PT-6?
 
Thanks,
He really loved a ride in my = 360.
 
Mark Ravinski
1479 hrs
----- Original Message -----
From:=20 marv@lancair.net=20
Sent: Monday, November 02, 2009 = 7:51=20 AM
Subject: [LML] Re: AOA = Calibration=20 Questions

Posted for John Hafen = <j.hafen@comcast.net>:

&= nbsp;Gents:
 
 Hopefully=20 someone on the list knows way more about my AOA than I=20 do.  Thanks
 in advance for your=20 assistance.
 
 Running through the AOA PRO II = Calibration=20 Check List, in the Cruise
 Configuration Calibration, the = checklist=20 says:
 
 Zero G Maneuver for 1/2=20 second:        =20 YES
 
 The next line says:
 
 PTT Red = Record=20 = Button           &= nbsp;        PUSH/RELEASE
&nbs= p;
 My=20 question:  Am I to assume that you push the Red PTT button = during=20 the 1/2
 second of Zero G=20 Flight?  After?  When?
 
 You also = have to=20 do some button pushing at 1.15 of Clean stall, and
 1.15 of=20 dirty/landing configuration stall.
 
 Having not = repeatedly=20 stalled my IVP while looking closely at the = airspeed
 indicator, I=20 admit I can=B9t say exactly what the clean and dirty stall = speeds
 are,=20 although the numbers I have been able to glean are that an IVP=20 should
 have a clean and dirty stall speed of 80 and 75 KIAS=20 respectively.
 
 So to calibrate the AOA, I would be = pushing=20 the buttons at 92 and 87 KIAS
 for clean and=20 dirty.
 
 Is there any reason to calibrate at higher = speeds=20 than 92 and 87?  Would you
 get an earlier warning = of an=20 impending stall?
 
 Your advice and comments are very=20 welcome.
 
 Regards,
 
 John=20 Hafen
 IVP 413AJ =8B 200 hours


[The AOA records the = data at=20 the release of the PTT button, so you can press it when you start the = maneuver=20 and release it at the instant you are satisfied that you are = performing the=20 required maneuver.   <marv>   = ]

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