Return-Path: Received: from relay02.roc.ny.frontiernet.net ([66.133.131.35] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2633864 for flyrotary@lancaironline.net; Sun, 12 Oct 2003 12:56:33 -0400 Received: (qmail 22939 invoked from network); 12 Oct 2003 16:56:32 -0000 Received: from unknown (HELO frontiernet.net) ([170.215.97.8]) (envelope-sender ) by relay02.roc.ny.frontiernet.net (FrontierMTA 2.3.6) with SMTP for ; 12 Oct 2003 16:56:32 -0000 Message-ID: <3F8979E0.9868891E@frontiernet.net> Date: Sun, 12 Oct 2003 11:57:20 -0400 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EWP - series pumps and wacky ideas References: Content-Type: multipart/alternative; boundary="------------8FB7FEE6A8E12761619A9371" --------------8FB7FEE6A8E12761619A9371 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit <... how long the engine would run at cruise power, with no water flow, ...> <... If your water pump dies, the engine won't quit immediately, but you will need to get that second pump on right away ...> <... almost have to have a flow meter that goes into alarm ...> If the pump fails, the coolant temp rises. You already know what that is. Hook it to an alarm that will alert you to turn on the other pump. On a related subject, one might do the same thing with fuel pumps - you know the fuel pressure - why not hook it to an alarm if it drops below a certain value. Does anyone know with any accuracy how fuel pumps fail? I doubt they fail catastrophically. I suspect they fail by degrees (probably very gradually as the poorly maintained filter clogs up). Just a theory ... Jim S. Russell Duffy wrote: > I do the same thing Rusty, I just run both fuel pumps all the > time. If you run one pump and it fails, the engine will stop > running immediately. If you run an EWP and it fails, your > engine won't quit immediately, so you would have a little time > to switch over to the other EWP. > > Perry Mick > http://www.ductedfan.com > > Hi Perry. If your water pump dies, the engine won't quit > immediately, but you will need to get that second pump on > right away. To do that, you would almost have to have a flow > meter that goes into alarm below a certain amount of flow, and > better yet, kicks on the backup pump automatically. > Can anyone estimate how long the engine would run at cruise > power, with no water flow, before you boil away lots of > coolant, and warp the housings? I'm afraid it wouldn't be > more than a minute or so. > Cheers, > Rusty (I'm NOT going to experiment with no-flow conditions > ) > > > > -- Jim Sower Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T --------------8FB7FEE6A8E12761619A9371 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <... how long the engine would run at cruise power, with no water flow, ...>
<... If your water pump dies, the engine won't quit immediately, but you will need to get that second pump on right away ...>
<... almost have to have a flow meter that goes into alarm ...>
If the pump fails, the coolant temp rises. You already know what that is. Hook it to an alarm that will alert you to turn on the other pump.

On a related subject, one might do the same thing with fuel pumps - you know the fuel pressure - why not hook it to an alarm if it drops below a certain value. Does anyone know with any accuracy how fuel pumps fail? I doubt they fail catastrophically. I suspect they fail by degrees (probably very gradually as the poorly maintained filter clogs up).

Just a theory ... Jim S.

Russell Duffy wrote:

I do the same thing Rusty, I just run both fuel pumps all the time. If you run one pump and it fails, the engine will stop running immediately. If you run an EWP and it fails, your engine won't quit immediately, so you would have a little time to switch over to the other EWP.
Perry Mick
http://www.ductedfan.com 
Hi Perry. If your water pump dies, the engine won't quit immediately, but you will need to get that second pump on right away. To do that, you would almost have to have a flow meter that goes into alarm below a certain amount of flow, and better yet, kicks on the backup pump automatically.

Can anyone estimate how long the engine would run at cruise power, with no water flow, before you boil away lots of coolant, and warp the housings? I'm afraid it wouldn't be more than a minute or so.

Cheers,

Rusty (I'm NOT going to experiment with no-flow conditions <g>)
 

--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T
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