Mailing List flyrotary@lancaironline.net Message #66253
From: William Schertz wschertz343@gmail.com <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Water direction
Date: Thu, 20 Aug 2020 06:54:58 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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 danger 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’t.
If this doesn’t 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.


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