X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 Jun 2010 18:29:38 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma06.mx.aol.com ([64.12.78.142] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4371050 for lml@lancaironline.net; Fri, 25 Jun 2010 18:20:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.78.142; envelope-from=Sky2high@aol.com Received: from imo-da03.mx.aol.com (imo-da03.mx.aol.com [205.188.169.201]) by imr-ma06.mx.aol.com (8.14.1/8.14.1) with ESMTP id o5PMK0BD026582 for ; Fri, 25 Jun 2010 18:20:01 -0400 Received: from Sky2high@aol.com by imo-da03.mx.aol.com (mail_out_v42.9.) id q.d89.ddf40f9 (55834) for ; Fri, 25 Jun 2010 18:19:56 -0400 (EDT) Received: from magic-m16.mail.aol.com (magic-m16.mail.aol.com [172.21.188.208]) by cia-md06.mx.aol.com (v129.4) with ESMTP id MAILCIAMD062-da1a4c252b8c4f; Fri, 25 Jun 2010 18:19:56 -0400 From: Sky2high@aol.com X-Original-Message-ID: <34888.d0294aa.3956858c@aol.com> X-Original-Date: Fri, 25 Jun 2010 18:19:56 EDT Subject: Re: [LML] Re: LNC2/320 Cruise Speed X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_34888.d0294aa.3956858c_boundary" X-Mailer: AOL 9.5 sub 155 X-AOL-ORIG-IP: 67.175.87.113 X-AOL-IP: 172.21.188.208 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_34888.d0294aa.3956858c_boundary Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Matt, =20 If Lorn is using ram air, the increase in IAS from 139 to 152 would =20 increase the ram pressure (theoretical is about .22" Hg for that speed ch= ange)=20 and the prop going by more often might also be a slight boost to inlet ra= m=20 pressure. He didn't mention any throttle change. His AOA would have=20 decreased a bit too. =20 Grayhawk =20 =20 In a message dated 6/25/2010 3:49:00 P.M. Central Daylight Time, =20 matt.hapgood@alumni.duke.edu writes: Why did MP change with fuel/RPM change? Matt On Jun 25, 2010, at 1:59 PM, Lorn H Olsen wrote: > 06/22/10 I was flying from Detroit to Ft Lauderdale at 11,000. With=20 nothing else to do, I thought that I would take a few measurements. >=20 > Condition LOP Lo ROP Hi > --------- -------- --------- > 11,000 IA 2,350RPM 2,700 RPM > 13,000 DA 19.3"MP 19.8"MP > 30.08 "Hg 6.0 GPH 8.6 GPH > 12=B0C temp 139 kts IAS 152 kts IAS > 35=B0F dewpt? 168 kts TAS 183 kts TAS > 1,670 lbs >=20 > For a 43% increase in fuel, a 9% increase in airspeed doesn't sound lik= e=20 much. However, 183 kts airspeed at 13,000 ft density altitude, no matter= =20 how you do it, is great. >=20 > The LOP reading at .435 BSFC comes out to HP =3D 36 * 6 * .435 =3D 94.0= HP=20 or 94.0 / 160 =3D 59% power. >=20 > Comments appreciated. >=20 > Lorn >=20 > -- > Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst > DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us > LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan >=20 >=20 > -- > For archives and unsub =20 http://mail.lancaironline.net:81/lists/lml/List.html -- For archives and unsub =20 http://mail.lancaironline.net:81/lists/lml/List.html --part1_34888.d0294aa.3956858c_boundary Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable <= FONT id=3Drole_document color=3D#000000 size=3D2 face=3DArial>
Matt,
 
If Lorn is using ram air, the increase in IAS from 139 to 152 would= =20 increase the ram pressure (theoretical is about .22" Hg for that speed=20 change) and the prop going by more often might also be a sl= ight=20 boost to inlet ram pressure.  He didn't mention any throttle=20 change.  His AOA would have decreased a bit too.
 
Grayhawk
 
In a message dated 6/25/2010 3:49:00 P.M. Central Daylight Time,=20 matt.hapgood@alumni.duke.edu writes:
Why did=20 MP change with fuel/RPM change?

Matt

On Jun 25, 2010, at= 1:59=20 PM, Lorn H Olsen <lorn@dynacomm.us> wrote:

> 06/22/10 I= was=20 flying from Detroit to Ft Lauderdale at 11,000. With nothing else to do,= I=20 thought that I would take a few measurements.
>
> &nbs= p;=20 Condition   LOP Lo      ROP Hi
> &nb= sp;=20 ---------   --------    ---------
>  = ;=20 11,000 IA   2,350RPM    2,700 RPM
>  = ;=20 13,000 DA   19.3"MP     19.8"MP
> &n= bsp;=20 30.08 "Hg   6.0 GPH     8.6 GPH
> &n= bsp;=20 12=B0C temp   139 kts IAS 152 kts IAS
>   35= =B0F dewpt?=20 168 kts TAS 183 kts TAS
>   1,670 lbs
>
>= For a=20 43% increase in fuel, a 9% increase in airspeed doesn't sound like much.= =20 However, 183 kts airspeed at 13,000 ft density altitude, no matter how= you do=20 it, is great.
>
> The LOP reading at .435 BSFC comes out to= HP =3D=20 36 * 6 * .435 =3D 94.0 HP or 94.0 / 160 =3D 59% power.
>
>= Comments=20 appreciated.
>
> Lorn
>
> --
> Lorn H.= =20 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
> DynaComm, Corp.,= =20 248-345-0500, mailto:lorn@dynacomm.us
> LNC2, FB90/92, O-320-D1F,= 1,700=20 hrs, N31161, Y47, SE Michigan
>
>
> --
> For= =20 archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html

--
For ar= chives=20 and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html
--part1_34888.d0294aa.3956858c_boundary--