Return-Path: Received: from [216.52.245.18] (HELO ispwestemail1.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2902376 for flyrotary@lancaironline.net; Tue, 23 Dec 2003 09:36:30 -0500 Received: from 7n7z201 (unverified [65.56.136.243]) by ispwestemail1.mdeinc.com (Vircom SMTPRS 3.0.273) with SMTP id for ; Tue, 23 Dec 2003 06:36:28 -0800 Message-ID: <044601c3c962$22672970$272dbbd0@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] dual EWP plumbing? Date: Tue, 23 Dec 2003 08:35:32 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0442_01C3C92F.BA9049D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0442_01C3C92F.BA9049D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI am trying to understand this plumbing scheme. Where in the = circuit are the water pumps? Are they after the "Y splitter", or on the = line going from the core to the Meziere inlet? The pumps are likely to = do better at 'pushing' the liquid rather than pulling it, so you want = the outlet of the pump going into the evaporator core. One operational concern is if you are operating on one core, and the = thermostat calls for the second pump, when it turns on, it is going to = be delivering 'cold' fluid that has been stagnant in the core to the = engine. you 'might' end up with oscillations in the cycling of the pump. = Will this cause a problem? Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, December 22, 2003 8:39 PM Subject: [FlyRotary] dual EWP plumbing? Greetings, As I continue on the painfully slow process of de-BUC-ing the plane, = I'm looking into plumbing options for the EWP's. The Meziere adapter = has two inlets, and one outlet to the engine. The plan is to run the = one large outlet to a Y splitter, then to each evap core. Since there = are two core outlets, two EWP's, and two inlets to the engine, it's = mighty tempting to let each EWP handle only one core. It's certainly = the simplest way to plumb it. BTW, I do have one way valves, so there = will be no backflow through the pump that's off. In a way, this makes sense to me, because I can thermostatically = control one of the pumps, and leave the other one on all the time. In = normal cruise flight, cold weather, and certainly descent, one core will = be enough. Eventually, I may install an effective cowl flap to cut drag = at cruise, and the plumbing can certainly be re-worked if needed then, = or I can just let both pumps run. The worst case situation is that one = pump fails on climb, but the EM-2 (that Tracy is still adding features = to ) will tell me the temp is going up, and I'll reduce power, or = increase speed. =20 One other possible benefit is more even flow through the cores when = both pumps are on. Haven't I heard some of you say that you've had = difficulty getting the water to flow evenly though parallel cores? =20 In my usual masochistic way, I offer this idea for your abuse, or is = that the other list :-) Cheers, Rusty (learning more about exhaust every day) ------=_NextPart_000_0442_01C3C92F.BA9049D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I am trying to understand this plumbing = scheme.=20 Where in the circuit are the water pumps? Are they after the "Y = splitter", or on=20 the line going from the core to the Meziere inlet?  The pumps are = likely to=20 do better at 'pushing' the liquid rather than pulling it, so you want = the outlet=20 of the pump going into the evaporator core.
 
One operational concern is if you are = operating on=20 one core, and the thermostat calls for the second pump, when it turns = on, it is=20 going to be delivering 'cold' fluid that has been stagnant in the core = to the=20 engine. you 'might' end up with oscillations in the cycling of the pump. = Will=20 this cause a problem?
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, December 22, 2003 = 8:39=20 PM
Subject: [FlyRotary] dual EWP=20 plumbing?

Greetings,
 
As I continue = on the=20 painfully slow process of de-BUC-ing the plane, I'm looking into = plumbing=20 options for the EWP's.  The Meziere adapter has two inlets, and = one=20 outlet to the engine.  The plan is to run the one large outlet to = a Y=20 splitter, then to each evap core.  Since there are two core = outlets, two=20 EWP's, and two inlets to the engine, it's mighty tempting to let each = EWP=20 handle only one core.  It's certainly the simplest way to plumb = it. =20 BTW, I do have one way valves, so there will be no backflow through = the pump=20 that's off.
 
In a way, = this makes=20 sense to me, because I can thermostatically control one of the = pumps, and=20 leave the other one on all the time.  In normal cruise flight, = cold=20 weather, and certainly descent, one core will be enough.  = Eventually, I=20 may install an effective cowl flap to cut drag at cruise, and the = plumbing can=20 certainly be re-worked if needed then, or I can just let both pumps = run. =20 The worst case situation is that one pump fails on climb, but the EM-2 = (that=20 Tracy is still adding features to <g>) will tell me the temp is = going=20 up, and I'll reduce power, or increase=20 speed.   
 
One other = possible=20 benefit is more even flow through the cores when both pumps are=20 on.   Haven't I heard some of you say that you've had = difficulty=20 getting the water to flow evenly though parallel cores? =20
 
In my usual = masochistic=20 way, I offer this idea for your abuse, or is that the other list=20 :-)
 
Cheers,
Rusty = (learning more=20 about exhaust every = day)
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