X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from access.aic-fl.com ([207.30.253.2] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2161445 for flyrotary@lancaironline.net; Fri, 06 Jul 2007 08:43:09 -0400 Received-SPF: softfail receiver=logan.com; client-ip=207.30.253.2; envelope-from=unicorn@gdsys.net Received: from main (gdsi-45.gdsys.net [207.30.255.45]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Fri, 6 Jul 2007 07:38:57 -0500 Message-ID: <003701c7bfcb$1dcba4a0$2dff1ecf@main> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: OMP flow rate Date: Fri, 6 Jul 2007 07:42:29 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0034_01C7BFA1.346C2150" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0034_01C7BFA1.346C2150 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Friday, July 06, 2007 1:20 AM Subject: [FlyRotary] Re: OMP flow rate ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Thursday, July 05, 2007 7:12 PM Subject: [FlyRotary] OMP flow rate Does anyone know what the flow rate is from the OMP? Unfortunately, I don't know what year the pump is from. It is on my = 20B which has a 12A front cover. It is a 4-port, likely from a 13B, in = which one port has been blocked and the other three go one to each rotor = housing. The only data I have on hand is what Richard measured some years = ago, running the pump at 6000 rpm. This could useful if I knew the = ratio of pump speed to eccentric shaft speed. Thanks, Al The OMP drive gear is the same size as the distributor gear. So it = runs half as fast as the E-shaft. In my tests I referred to the E-shaft = speed. Richard Sohn N2071U Thanks; Richard. I wasn't sure because what I have in my file ends = with some open question about the speed: > At 6000RPM crank speed and 48deg. control lever opening angle, the = flow rate is 498cc or .498Liter/hour. > Opening the control lever to 90deg.resulted in a flow rate of = .688Liter/hour. > The 90deg. position seems to be the maximum for the pump. A run = with the lever at 180deg. did not change the flow rate. >=20 > Richard. > Richard. Your oil flow rate seems very high. Fuel consumption off = 30 > litres/hour at 6000 rpm and .5l of oil gives a ratio of 60 to one. = Most of > us run around 120 - 150 to one. Does the pump actually run at = crank(e shaft) > speed? > Ian Beadle RV6A W. Australia Good point Ian. I don't think it does. Al This test was at maximum condition setting. This condition only = exists in a 6000RPM/WOT situation. This rarely happens in a car. In = addition, the flow adjusted by the control lever does not seem to have a = linear characteristc, it is more like a snap at one point. I never = investigated that. I fully agree with the 120 - 150 to one as an = average. Richard Sohn N2071U -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.476 / Virus Database: 269.10.0/886 - Release Date: = 7/4/2007 1:40 PM ------=_NextPart_000_0034_01C7BFA1.346C2150 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

----- Original Message -----

From:=20 Al = Gietzen=20

To: Rotary motors in = aircraft

Sent: Friday, July 06, 2007 = 1:20 AM

Subject: [FlyRotary] Re: OMP = flow=20 rate

----- Original Message = -----=20

From: Al = Gietzen=20

To: Rotary motors in = aircraft=20

Sent:=20 Thursday, July 05,=20 2007 7:12=20 PM

Subject:=20 [FlyRotary] OMP flow rate

Does = anyone know=20 what the flow rate is from the OMP?

Unfortunately, I=20 don=92t know what year the pump is from. It is on my 20B which = has a 12A=20 front cover. It is a 4-port, likely from a 13B, in which one = port has=20 been blocked and the other three go one to each rotor=20 housing.

The = only data I=20 have on hand is what Richard measured some years ago, running the = pump at=20 6000 rpm. This could useful if I knew the ratio of pump speed = to=20 eccentric shaft speed.

Thanks,

Al

The = OMP drive=20 gear is the same size as the distributor gear. So it runs half as = fast as=20 the E-shaft. In my tests I referred to the E-shaft=20 speed.

Richard=20 Sohn
N2071U

Thanks; = Richard. I wasn=92t sure because what I have in my file ends = with some=20 open question about the speed:

> At 6000RPM=20 crank speed and 48deg. control lever opening angle, the flow rate is = 498cc=20 or .498Liter/hour.
> Opening the control lever to = 90deg.resulted in a=20 flow rate of .688Liter/hour.
> The 90deg. position seems to be = the=20 maximum for the pump. A run with the lever at 180deg. did not change = the=20 flow rate.
>
> Richard.

> Richard. Your oil flow rate seems = very high.=20 Fuel consumption off 30
> litres/hour at 6000 rpm and .5l of = oil gives=20 a ratio of 60 to one. Most of
> us run around 120 - 150 to = one. Does=20 the pump actually run at crank(e shaft)
> speed?
>=20 Ian Beadle RV6A W. Australia

Good point Ian. I = don't=20 think it does.

Al

This test was at maximum condition setting. This = condition=20 only exists in a 6000RPM/WOT situation. This rarely happens in a = car. In=20 addition, the flow adjusted by the control lever does not seem to = have a=20 linear characteristc, it is more like a snap at one point. I never=20 investigated that. I fully agree with the 120 - 150 to one as an=20 average.

Richard=20 = Sohn
N2071U

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.476 / Virus Database: 269.10.0/886 - Release = Date:=20 7/4/2007 1:40 PM
------=_NextPart_000_0034_01C7BFA1.346C2150--