X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 03 Nov 2009 08:21:37 -0500 Message-ID: X-Original-Return-Path: Received: from web112614.mail.gq1.yahoo.com ([98.137.27.194] verified) by logan.com (CommuniGate Pro SMTP 5.2.17) with SMTP id 3914069 for lml@lancaironline.net; Mon, 02 Nov 2009 21:50:05 -0500 Received-SPF: neutral receiver=logan.com; client-ip=98.137.27.194; envelope-from=airmale@windstream.net Received: (qmail 50834 invoked by uid 60001); 3 Nov 2009 02:49:31 -0000 X-Original-Message-ID: <299703.50820.qm@web112614.mail.gq1.yahoo.com> X-YMail-OSG: WoCLiCUVM1mpXLE_yoAwWhpajoPJwp2l6UvTj_qohWIZ1T3Mfpg5L0kOUW3HIQO.2eSwaBFvFgseijL7uR.t0vzi78CN4lEpKOzrTmJlF1u0_p5IBknb1_KAPslcjvMv2ZdaMWQCa.F7M6s0hodh7asbemA2UHVWPMrcCwFCMK55ZFj4h90Ii4D_CSi0T83d_kmEl4lgc5HvOLffyh1vK0Ls9NcmBlK4pYeLDUWlEbaRrukk40vlVQtac9Gi4uPU2ceBjZ8lLJPKEpTmykE9DA54rOlAxydcmvhIdQm7CXlhRdd2kDErmcjEIgwiUa7HTN8H1WxOOWW6vrHKKIN9jInfKdVz0w-- Received: from [98.21.179.216] by web112614.mail.gq1.yahoo.com via HTTP; Mon, 02 Nov 2009 18:49:31 PST X-RocketYMMF: airmale4 X-Mailer: YahooMailRC/211.6 YahooMailWebService/0.7.361.4 References: X-Original-Date: Mon, 2 Nov 2009 18:49:31 -0800 (PST) From: J H Webb Subject: Re: [LML] unfeathering accumulator question X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-544135100-1257216571=:50820" --0-544135100-1257216571=:50820 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mark,=0AWith a free turbine, there is absolutly no problem unfeathering the= PT6. This engine is unique in that you can feather it and still have the e= ngine running providing the aircraft with power due to the free turbine des= ign. I have flown the PT6 in a vast number of aircraft including the Lanca= ir IVP. I have flown this engine doing Expemental Flight Test inclyding Kno= w Iciing testing. It is a smooth light engine that does not require an unfe= athering accumlator unless you want to unfeather the prop in flight without= the engine running. But I cannot think of a reason to do this as the drag = rise is very substantial.=0A=0AJack Webb=0AL360, LIV=0AFormer Chief Enginee= ring Test Pilot=0ABSAE=0A=0A=0A=0A=0A________________________________=0AFro= m: Mark Ravinski =0ATo: lml@lancaironline.net=0ASent: Mo= n, November 2, 2009 12:32:41 PM=0ASubject: [LML] unfeathering accumulator q= uestion=0A=0A =0ATurbine types,=0AI met a fellow yesterday who is building = a Seawind =0Awith a 550 hp PT-6. It is complete except for paint.=0AHe say= s he will not be able to unfeather the prop =0Ain flight if there is no oil= pressure. (engine not running)=0AIt seems I've read here on the LML that = some =0Aturbines are equipped with unfeathering accumulators.=0ACan anyone = enlighten me about that for a =0APT-6?=0A =0AThanks,=0AHe really loved a ri= de in my 360.=0A =0AMark Ravinski=0A1479 hrs=0A----- Original Message -----= =0A>From: marv@lancair.net =0A>To: lml@lancaironline.net =0A>Sent: Monday,= November 02, 2009 7:51 =0A> AM=0A>Subject: [LML] Re: AOA Calibration =0A>= Questions=0A>=0A>=0A>Posted for John Hafen :=0A>=0A>= Gents:=0A> =0A> Hopefully =0A> someone on the list knows way more about m= y AOA than I =0A> do. Thanks=0A> in advance for your =0A> assistance.=0A= > =0A> Running through the AOA PRO II Calibration =0A> Check List, in the = Cruise=0A> Configuration Calibration, the checklist =0A> says:=0A> =0A> Ze= ro G Maneuver for 1/2 =0A> second: =0A> YES=0A> =0A> The next lin= e says:=0A> =0A> PTT Red Record =0A> Button PUSH/RELEAS= E=0A> =0A> My =0A> question: Am I to assume that you push the Red PTT but= ton during =0A> the 1/2=0A> second of Zero G =0A> Flight? After? When?= =0A> =0A> You also have to =0A> do some button pushing at 1.15 of Clean st= all, and=0A> 1.15 of =0A> dirty/landing configuration stall.=0A> =0A> Havi= ng not repeatedly =0A> stalled my IVP while looking closely at the airspee= d=0A> indicator, I =0A> admit I can=C2=B9t say exactly what the clean and = dirty stall speeds=0A> are, =0A> although the numbers I have been able to = glean are that an IVP =0A> should=0A> have a clean and dirty stall speed o= f 80 and 75 KIAS =0A> respectively.=0A> =0A> So to calibrate the AOA, I wo= uld be pushing =0A> the buttons at 92 and 87 KIAS=0A> for clean and =0A> = dirty.=0A> =0A> Is there any reason to calibrate at higher speeds =0A> tha= n 92 and 87? Would you=0A> get an earlier warning of an =0A> impending st= all?=0A> =0A> Your advice and comments are very =0A> welcome.=0A> =0A> Reg= ards,=0A> =0A> John =0A> Hafen=0A> IVP 413AJ =E2=80=B9 200 hours=0A>=0A>= =0A>[The AOA records the data at =0A> the release of the PTT button, so yo= u can press it when you start the maneuver =0A> and release it at the inst= ant you are satisfied that you are performing the =0A> required maneuver. = ]=0A>=0A>=0A>--=0A>=0A>For archives and unsub http://mail.lancai= ronline.net:81/lists/lml/List.html --0-544135100-1257216571=:50820 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Mark,
With a free turbine, there is absolutly no problem unfea= thering the PT6. This engine is unique in that you can feather it and still= have the engine running providing the aircraft with power due to the free = turbine design.  I have flown the PT6 in a vast number of aircraft inc= luding the Lancair IVP. I have flown this engine doing Expemental Flight Te= st inclyding Know Iciing testing. It is a smooth light engine that does not= require an unfeathering accumlator unless you want to unfeather the prop i= n flight without the engine running. But I cannot think of a reason to do t= his as the drag rise is very substantial.

Jack Webb
L360, LIV
= Former Chief Engineering Test Pilot
BSAE

From: Mark Ravinski <mjrav@comcast.net>
= To: lml@lancaironline.net<= br>Sent: Mon, November 2, = 2009 12:32:41 PM
Subject: [LML] unfeathering accumulator question

=0A=0A=0A =0A =0A<= style>=0A=0A
Turbine types,
=0A
I met a fellow yesterday w= ho is building a Seawind =0Awith a 550 hp PT-6.  It is complete except= for paint.
=0A
He says he = will not be able to unfeather the prop =0Ain flight if there is no oil pres= sure.  (engine not running)
=0A
It seems I've read here on the LML that some =0Aturbines are equi= pped with unfeathering accumulators.
=0A
Can anyone enlighten me about that for a =0APT-6?=0A
 
=0A
Thanks,
=0A
He really loved a ride in my 360.
=0A
 
=0A
Mark Ravinski
=0A
14= 79 hrs
=0A
=0A
----- Original Message -----
=0A
From: =0A marv@lancair.net =0A
=0A <= div style=3D"font-family: arial; font-style: normal; font-variant: normal; = font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust= : none; font-stretch: normal; -x-system-font: none;">To: lml@lancairo= nline.net
=0A
Sent: Monday, November 02, 2009 7:51 =0A AM
=0A
Subject: [LML] Re: AOA = Calibration =0A Questions
=0A

=0A
Posted for John Hafen <j.hafen@comcast.net>:

 Gents:
 
 Hope= fully =0A someone on the list knows way more about my AOA than I =0A do.&= nbsp; Thanks
 in advance for your =0A assistance.
  Running through the AOA PRO II Calibration =0A Check List, in the = Cruise
 Configuration Calibration, the checklist =0A says:
&nbs= p;
 Zero G Maneuver for 1/2 =0A second:    &nb= sp;    =0A YES
 
 The next line says:
&n= bsp;
 PTT Red Record =0A Button      = ;            &n= bsp; PUSH/RELEASE
 
 My =0A question:  Am I= to assume that you push the Red PTT button during =0A the 1/2
 se= cond of Zero G =0A Flight?  After?  When?
  You also have to =0A do some button pushing at 1.15 of Clean stall,= and
 1.15 of =0A dirty/landing configuration stall.
 
=  Having not repeatedly =0A stalled my IVP while looking closely at th= e airspeed
 indicator, I =0A admit I can=C2=B9t say exactly what t= he clean and dirty stall speeds
 are, =0A although the numbers I h= ave been able to glean are that an IVP =0A should
 have a clean an= d dirty stall speed of 80 and 75 KIAS =0A respectively.
 
 = ;So to calibrate the AOA, I would be pushing =0A the buttons at 92 and 87 = KIAS
 for clean and =0A dirty.
 
 Is there any rea= son to calibrate at higher speeds =0A than 92 and 87?  Would you=
 get an earlier warning of an =0A impending stall?
 
&= nbsp;Your advice and comments are very =0A welcome.
 
 Reg= ards,
 
 John =0A Hafen
 IVP 413AJ =E2=80=B9 200 h= ours


[The AOA records the data at =0A the release of the PTT bu= tton, so you can press it when you start the maneuver =0A and release it a= t the instant you are satisfied that you are performing the =0A required m= aneuver.   <marv>   ]

=0A

--

For archives and unsub http://mail.lancaironline= .net:81/lists/lml/List.html
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