X-Virus-Scanned: clean according to Sophos on Logan.com From: "Stephen Izett" Received: from mail-pf0-f172.google.com ([209.85.192.172] verified) by logan.com (CommuniGate Pro SMTP 6.1.13) with ESMTPS id 9220744 for flyrotary@lancaironline.net; Wed, 30 Nov 2016 03:40:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.172; envelope-from=steveize@gmail.com Received: by mail-pf0-f172.google.com with SMTP id i88so37844814pfk.2 for ; Wed, 30 Nov 2016 00:40:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:mime-version:subject:date:references:to:in-reply-to:message-id; bh=a+28+dm3TLbaT2caQTBXPfsId9QrmnnQh7JuHqoLP5A=; b=gipSnemMK+LfHBTZ+cPGgDMWEAMWxnqv+Z2m8u7G3eOp5yUlErcPBfdcQnT2/rEWA3 8AtK/32DNH1e4Ui4q9thuRd7WHmrLBevBOWUcMHFlRcnS0FMqfrUENlleAZwOdS40Hqp Dhgyw3Z+seeiHZqKMsFN69i0CIGnrf9K7O+Q65AgCDWSJbO6gkHwkzmQY80/PjzQ99GM XVPzg1jLL/gszYKKl3M9FJ9i3Ga+41G4PYmYeir8z9twFrVFZyDEfu+RackoSG7XKyft hQlCo/EmyFeLSLHFA59vwPjP8OEedmmP0U3tHd/ztN0oWuv4+Z1lz0AX18gpbPw5JSwX Qpiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:mime-version:subject:date:references:to :in-reply-to:message-id; bh=a+28+dm3TLbaT2caQTBXPfsId9QrmnnQh7JuHqoLP5A=; b=FI8nVIrK0r+flbWkBgeL6r5uXaFBc1XPGYJB3Omx1vANRnX1dZkzvzsnbkKgy6qRkN lQEQSw12r8aU6g4w4pNmG86aq4paPXQv+fWFVoi2urzpNB4z6emC1T56zySGEguOMdcj wNFFME8AQrhDwF3wt97RthqhL7zLLIx/CyBUGC1LvB8xKTKilifMWPXMN51e6Doqdp2k 4UkzeuY2PYFn/4cYnwE9m6ATtVUy44mi9tqDQa8QRY28JCGh9D66Bs7f6UyYzyfR/OLT nRLYbBoJrKA8sv/vY1E7CpZMKyxspISP/C6IfxAEeohW6bPSrShabzvGipcWlD7/utpq apwg== X-Gm-Message-State: AKaTC0123txY2jdS1daYvUkeTOyZXwG90fDg+NXWBDQAucNrk4q56lWvi20ST/qlx6CmNw== X-Received: by 10.99.192.69 with SMTP id z5mr57503842pgi.169.1480495214292; Wed, 30 Nov 2016 00:40:14 -0800 (PST) Return-Path: Received: from [10.1.1.5] (124-148-93-146.dyn.iinet.net.au. [124.148.93.146]) by smtp.gmail.com with ESMTPSA id a68sm82891057pgc.31.2016.11.30.00.40.12 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Nov 2016 00:40:13 -0800 (PST) X-Google-Original-From: Stephen Izett Content-Type: multipart/alternative; boundary="Apple-Mail=_141FEC5B-B96C-4051-9F0D-2FE0D6A4419A" Mime-Version: 1.0 (Mac OS X Mail 10.1 \(3251\)) Subject: Re: [FlyRotary] Re: flight conditions for HX data Date: Wed, 30 Nov 2016 16:40:09 +0800 References: To: Rotary motors in aircraft In-Reply-To: Message-Id: X-Mailer: Apple Mail (2.3251) --Apple-Mail=_141FEC5B-B96C-4051-9F0D-2FE0D6A4419A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Thanks again Steve > On 30 Nov. 2016, at 4:32 pm, Steven W. Boese = wrote: >=20 > Steve, > It is difficult to specify a delta P that would be suitable for = effective cooling because of all the other variables in the cooling = system. In my case, 2 inches of water pressure across the core of a = Fluidyne DB-30618 oil cooler is more than sufficient to cool the oil at = 85 deg F OAT in climb or slow flight. > Average pressure at the exchanger face with a piccolo tube is easier = to measure and interpret and gives useful information concerning the = behavior of the duct. > Velocity measurement requires both a pitot and a static pressure = measurement at the location of interest. This combined with the area of = the duct and the air temperature at the location of interest enables the = calculation of mass air flow rate. Combining that with the delta T of = the air across the exchanger core enables the calculation of the rate of = heat exchanged. This can be compared to the rate of heat exchange = required as estimated from the fuel flow rate and engine characteristics = and serves as a reality check. > When assisting builders of a Zenith 601 with a Jabiru 6 cyl engine = installation with cooling system concerns, we used four pressure sensors = of the type you have except that they were differential pressure = sensors. We used the 5 volt excitation from the Dynon D180 to power the = sensors. We used the two normal fuel level inputs along with two of = the GP inputs all configured for capacitive fuel senders to log the = data. An additional logging instrument was not required and no = additional pilot workload was introduced when collecting data in this = way. > Steve Boese > RV6A, 1986 13B NA, RD1A, EC2 >=20 >=20 > From: Rotary motors in aircraft > on behalf of Stephen Izett = > > Sent: Monday, November 28, 2016 5:31 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: flight conditions for HX data > =20 > Thanks for the data Steve. > Congrats on successfully reaccelerated the air coming out the back of = the exchanger. > Did you find in your research what kind of delta pressures we could = aim at for a successful installation? >=20 > Ive got 4 or 5 MPX10GP=E2=80=99s that Ill build into a little pressure = sensor set to grab data for first flight. > Ive not worked with reading pressures before. What would you recommend = for the business end of the pressure pickup for: > 1. Pitot velocity measurement? > 2. Average pressure measurement? >=20 > Thanks > Steve --Apple-Mail=_141FEC5B-B96C-4051-9F0D-2FE0D6A4419A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Thanks again Steve

On = 30 Nov. 2016, at 4:32 pm, Steven W. Boese <flyrotary@lancaironline.net> wrote:

Steve,
It is difficult to specify a delta = P that would be suitable for effective cooling because of all the other = variables in the cooling system.  In my case, 2 inches of water = pressure across the core of a Fluidyne DB-30618 oil cooler is more = than sufficient to cool the oil at 85 deg F OAT in climb or slow = flight.
Average pressure at the exchanger face with a piccolo tube is = easier to measure and interpret and gives useful information = concerning the behavior of the duct.
Velocity measurement requires both a = pitot and a static pressure measurement at the location of = interest.  This combined with the area of the duct and the air = temperature at the location of interest enables the calculation of mass = air flow rate.  Combining that with the delta T of the air = across the exchanger core enables the calculation of the rate of heat = exchanged.  This can be compared to the rate of heat exchange = required as estimated from the fuel flow rate and engine = characteristics and serves as a reality check.
When assisting = builders of a Zenith 601 with a Jabiru 6 cyl engine installation with = cooling system concerns, we used four pressure sensors of the type you = have except that they were differential pressure sensors.  We used = the 5 volt excitation from the Dynon D180 to power the = sensors.   We used the two normal fuel level inputs = along with two of the GP inputs all configured for capacitive fuel = senders to log the data.  An additional logging instrument was not = required and no additional pilot workload was introduced when collecting = data in this way.

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2



From: Rotary motors in aircraft = <flyrotary@lancaironline.net> on behalf of Stephen = Izett <flyrotary@lancaironline.net>
Sent: Monday, November 28, 2016 = 5:31 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: flight = conditions for HX data
 
Thanks for the data Steve.
Congrats on = successfully reaccelerated the air coming out the back of the = exchanger.
Did you find in your research what kind = of delta pressures we could aim at for a successful = installation?

Ive got 4 or 5 MPX10GP=E2=80=99s that Ill = build into a little pressure sensor set to grab data for first = flight.
Ive not worked with reading pressures = before. What would you recommend for the business end of the pressure = pickup for:
1. Pitot velocity = measurement?
2. Average pressure = measurement?

Thanks
Steve
= --Apple-Mail=_141FEC5B-B96C-4051-9F0D-2FE0D6A4419A--