X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=EuKsUhUA c=1 sm=1 tr=0 a=KsrZmAOw/KbjvbDXy+jZnQ==:117 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=y4yBn9ojGxQA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=wHC2wf10XNE6MEB2_CQA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=n1YklaLJubsKJ44njHcA:9 a=1EkiU13j3x_bB7_I:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-io1-f52.google.com ([209.85.166.52] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 664291 for flyrotary@lancaironline.net; Thu, 20 Aug 2020 09:28:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.166.52; envelope-from=ceengland7@gmail.com Received: by mail-io1-f52.google.com with SMTP id u126so2113212iod.12 for ; Thu, 20 Aug 2020 06:28:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=eU3TBMFTBbDYMSIzugui8GP3Na2ibm95Zb1B0V7531c=; b=aBbFL+pZeFkAg5L4nJSNCdoycGIllrqG+eDtklj8hSJVJLZwK9Vq5mCIDjHDgDW/nM R28TzUJ2k9zRt3AcBvimB/UAu/TXtK/X5kAeNvxJAWnl2+ae4qMbE0Ef/gpVhuBK1aD2 +JKWJeu3seR7oQh27TCDBLJfRgSNoG/5MEPeXhoxihlds0MkignsPNR5sD7lxpJJKmfq 3uSVw9sT8suLCKkZ88nkDmijOr0Ai3EtxG1KHLjwEfUkTSJDxizsgmvkSrJXOUgYcAva DHHD42VO2i77jJLR//SD+Z4Tqr0aV+iZwlclMLCLOu3surbooQH/6RjRlDMsKgpbNhXV 35pg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=eU3TBMFTBbDYMSIzugui8GP3Na2ibm95Zb1B0V7531c=; b=sEu6qDk/C3g4Qh/YI0Pgk3WT0z2Eo0zMnhcQN9M0pPAd8+oa/KP2dL5+0J0VfUfxEW NCpYPWvkSvx0foQFxw6hKrPTd8zIIaK2hAs8N8uofEjjRPvzjOGxIaEKK2A30MQY4VzX 5AtxVKpz+F1cWO2Tv6WODnn6FXK7UV+FKELkElg754ha9t2ExClfVSqC0pySWsbavrym 8DEBduAS0PSfAFOqMCOQWCC9oISA81ojypqFDr7pmCzzxxPPg7W5ZFJ24DnuSED3yUFB u0nKk2Z9YnfE7zghmGtz4wsn0BFELvI+93ffve7unxTomy3SEJIjJcoXkA3ZyhEGdEAf 8K+A== X-Gm-Message-State: AOAM53390fQRmm+RRM15AZEVDY6HkTdbMyEOCdSvxpNp5L9BsNBxH0ey 8BB9lHDyk+DAA8/IlOsKaFFr+9dMi3RFQdLBWVX7ma7I X-Google-Smtp-Source: ABdhPJyRI9liP+iT2xVv3pV+vAcfxu+NZ/zd5l6VRIrpb1j5UUX7nQE/Fxkyw1MLZBLMOz1c57CrHtCjwMss1AUuMjU= X-Received: by 2002:a5e:c703:: with SMTP id f3mr2530538iop.185.1597930106163; Thu, 20 Aug 2020 06:28:26 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Thu, 20 Aug 2020 08:26:42 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Water direction To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000005a987705ad4f180c" --0000000000005a987705ad4f180c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Neil, If you're using an electric pump, the one change that should be simple to do and would improve the system design is to move the pump location physically lower. I'm working from a very old memory here, but IIRC, the one real downside to the rotary's pump location is that it's at the top of the engine. That means that if for some reason you start losing coolant, the pump quickly loses its ability to move water. Again, if memory is correct, with the pump at the 'bottom' of the system, you can keep coolant flowing for a bit longer. It won't cure anything, but if you have a pressure leak it might keep coolant moving long enough to find a landing site. I suppose it could have a slight benefit in the sense that it'll always have at least a little bit of pressure on the inlet, which could slightly reduce the risk of cavitation. If my memory is defective, hopefully someone else will correct me. Charlie On Thu, Aug 20, 2020 at 7:55 AM William Schertz wschertz343@gmail.com < flyrotary@lancaironline.net> wrote: > The water flow direction is important, the standard takes heat from the > hot side and tries to keep the coild side near the same temperature to > avoid the engine "becoming a banana". The impeller type pumps used in > engines are primarily 'pushers' > > On Thu, Aug 20, 2020 at 2:11 AM Stephen Izett stephen.izett@gmail.com < > flyrotary@lancaironline.net> wrote: > >> Hi Neil. >> >> Two thoughts I imagine that might create issues: >> 1. Energy transfer down due to delta T being lower, increasing the dange= r >> of nucleate boiling near the plugs >> 2. Creating a higher differential between the hot and cold sides of the >> engine producing increased expansion differences across the engine. >> >> Question: Do impeller pumps that we use suck and push equally well? My >> guess is that they don=E2=80=99t. >> If this doesn=E2=80=99t matter would it help with the physical layout to= suck the >> water through rather than push it through? >> >> Cheers >> >> Steve Izett >> >> > On 20 Aug 2020, at 3:30 pm, 12348ung@gmail.com < >> flyrotary@lancaironline.net> wrote: >> > >> > Gents, >> > Looking today how to hook up my electric water pump. >> The simplest is to send the water reverse to a standard pump. I do >> understand the hot side and the colder side but with the water being >> changes every 1 - 2 seconds, does this really matter? >> > Thoughts? >> > Neil. >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > --0000000000005a987705ad4f180c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Nei= l,

If you're using an= electric pump, the one change that should be simple to do and would improv= e the system design is to move the pump location physically lower. I'm = working from a very old memory here, but IIRC, the one real downside to the= rotary's pump location is that it's at the top of the engine. That= means that if for some reason you start losing coolant, the pump quickly l= oses its ability to move water. Again, if memory is correct, with the pump = at the 'bottom' of the system, you can keep coolant flowing for a b= it longer. It won't cure anything, but if you have a pressure leak it m= ight keep coolant moving long enough to find a landing site.

I suppose it could have a slight benefi= t in the sense=C2=A0that it'll always have at least a little bit of pre= ssure on the inlet, which could slightly reduce the risk of cavitation.

If my memory is defective, h= opefully someone else will correct me.

Charlie

On Thu, Aug 20, 2020 at 7:55 AM William Schertz = wschertz343@gmail.com <flyrotary@lancaironline.net&= gt; wrote:
The water flow direction is important, the standard takes heat = from the hot side and tries to keep the coild side near the same temperatur= e to avoid the engine "becoming a banana". The impeller type pump= s used in engines are primarily 'pushers'

On Thu, Aug 20, 2020 at 2:= 11 AM Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
<= /div>
Hi Neil.

Two thoughts I imagine that might create issues:
1. Energy transfer down due to delta T being lower, increasing the danger o= f nucleate boiling near the plugs
2. Creating a higher differential between the hot and cold sides of the eng= ine producing increased expansion differences across the engine.

Question: Do impeller pumps that we use suck and push equally well? My gues= s is that they don=E2=80=99t.
If this doesn=E2=80=99t matter would it help with the physical layout to su= ck the water through rather than push it through?

Cheers

Steve Izett

> On 20 Aug 2020, at 3:30 pm, 12348ung@gmail.com <flyrotary@lancaironline.net> wrote: >
> Gents,
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Looking t= oday how to hook up my electric water pump.=C2=A0 The simplest is to send t= he water reverse to a standard pump.=C2=A0 I do understand the hot side and= the colder side but with the water being changes every 1 - 2 seconds, does= this really matter?
> Thoughts?
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0Neil.


--
Homepage:=C2=A0 http://www.flyrotary.com/
Archive and UnSub:=C2=A0 =C2=A0http://mail= .lancaironline.net:81/lists/flyrotary/List.html
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