X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2160866 for flyrotary@lancaironline.net; Fri, 06 Jul 2007 01:19:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao107.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070706051910.NDJL22777.fed1rmmtao107.cox.net@fed1rmimpo02.cox.net> for ; Fri, 6 Jul 2007 01:19:10 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id L5K91X0031xAn3c0000000; Fri, 06 Jul 2007 01:19:09 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: OMP flow rate Date: Thu, 5 Jul 2007 22:20:15 -0800 Message-ID: <000001c7bf95$b7f445e0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7BF52.A9D105E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7BF52.A9D105E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 =20 ----- 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 =20 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. =20 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. =20 Thanks, =20 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. =20 Richard Sohn N2071U =20 Thanks; Richard. I wasn't sure because what I have in my file ends with some open question about the speed: =20 > 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. =20 Al ------=_NextPart_000_0001_01C7BF52.A9D105E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 

=

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

From: Al = Gietzen

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.
>
> 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

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