X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 Jun 2010 20:49:44 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma03.mx.aol.com ([64.12.206.41] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4371149 for lml@lancaironline.net; Fri, 25 Jun 2010 20:30:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.41; envelope-from=Sky2high@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-ma03.mx.aol.com (8.14.1/8.14.1) with ESMTP id o5Q0TAiE017619 for ; Fri, 25 Jun 2010 20:29:10 -0400 Received: from Sky2high@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.dcd.c4fdb53 (37557) for ; Fri, 25 Jun 2010 20:29:08 -0400 (EDT) Received: from magic-m16.mail.aol.com (magic-m16.mail.aol.com [172.21.188.208]) by cia-mb03.mx.aol.com (v129.4) with ESMTP id MAILCIAMB036-92b54c2549d3fa; Fri, 25 Jun 2010 20:29:07 -0400 From: Sky2high@aol.com X-Original-Message-ID: <3a595.31ea6989.3956a3d3@aol.com> X-Original-Date: Fri, 25 Jun 2010 20:29:07 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_3a595.31ea6989.3956a3d3_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_3a595.31ea6989.3956a3d3_boundary Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable I've got to try that.............. =20 Grayhawk =20 =20 In a message dated 6/25/2010 7:04:43 P.M. Central Daylight Time, =20 matt.hapgood@alumni.duke.edu writes: My experience is that I LOSE MP with increased RPM (all other things held= =20 equal).=20 Matt On Jun 25, 2010, at 6:29 PM, _Sky2high@aol.com_ (mailto:Sky2high@aol.com)= =20 wrote: 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_ (mailto:matt.hapgood@alumni.duke.edu) wri= tes: Why did MP change with fuel/RPM change? Matt On Jun 25, 2010, at 1:59 PM, Lorn H Olsen <_lorn@dynacomm.us_=20 (mailto:lorn@dynacomm.us) > 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_=20 (mailto:lorn@dynacomm.us)=20 > 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_ (http://mail.lancai= ronline.net:81/lists/lml/List.html)=20 -- For archives and unsub=20 _http://mail.lancaironline.net:81/lists/lml/List.html_ (http://mail.lancai= ronline.net:81/lists/lml/List.html)=20 =3D --part1_3a595.31ea6989.3956a3d3_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>
I've got to try that..............
 
Grayhawk
 
In a message dated 6/25/2010 7:04:43 P.M. Central Daylight Time,=20 matt.hapgood@alumni.duke.edu writes:
My experience is that I LOSE MP with increased RPM (all other thing= s held=20 equal). 

Matt

On Jun 25, 2010, at 6:29 PM, Sky2high@aol.com wrote:

<= /DIV>
Matt,
 
If Lorn is using ram air, the increase in IAS from 139 to 152 wou= ld=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=20 slight boost to inlet ram pressure.  He didn't mention any= =20 throttle 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,= matt.hapgood@alumni.duke.edu=20 writes:
Why=20 did MP change with fuel/RPM change?

Matt

On Jun 25, 20= 10, at=20 1:59 PM, Lorn H Olsen <lorn@dynacomm.us> wrote:
>=20 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=20 measurements.
>
>   Condition   LOP= =20 Lo      ROP Hi
>   --------- &nb= sp;=20 --------    ---------
>   11,000 IA &= nbsp;=20 2,350RPM    2,700 RPM
>   13,000 DA &= nbsp;=20 19.3"MP     19.8"MP
>   30.08=20 "Hg   6.0 GPH     8.6 GPH
> &nbs= p;=20 12=B0C temp   139 kts IAS 152 kts IAS
>  = 35=B0F=20 dewpt? 168 kts TAS 183 kts TAS
>   1,670 lbs
>= =20
> For a 43% increase in fuel, a 9% increase in airspeed doesn= 't=20 sound like much. However, 183 kts airspeed at 13,000 ft density alti= tude,=20 no matter how you do it, is great.
>
> The LOP reading= at=20 .435 BSFC comes out to HP =3D 36 * 6 * .435 =3D 94.0 HP or 94.0 / 16= 0 =3D 59%=20 power.
>
> Comments appreciated.
>
>=20 Lorn
>
> --
> Lorn H. 'Feathers' Olsen, MAA, ASME= L,=20 ASES, Comm, Inst
> DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
>=20 LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan
>= ;=20
>
> --
> For archives and unsub http://mail.lancaironline.ne= t:81/lists/lml/List.html

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