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Date: Fri, 22 Feb 2008 09:46:12 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: and a couple more
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paul malcolm booth wrote:
> G'day Ernest,
>   I'm a lurker from Downunder, could you please advise details of the 
> electric water pump in your photo?. Also is it instead of, or in 
> addition to the original pump?. Where is your radiator located?. We 
> are looking at a rear fuselage radiator, behind baggage area,- long 
> hoses, extra pump?.
>                       Regards,
>  
The pump is a Moroso brand pump designed for a Chevy.  $300 or so from Summit or 
Jegs (I forget which).  The water enters the center, and exits through the two 
legs, which are detachable.  I have 1" hose from the engine into the pump.  I 
tapped both the legs for 3/4" NPT fittings.  One I left in its original 
orientation and passed the fitting through the firewall.  This leaves a nice 
fitting sticking right out of the firewall. 3/4" hose leads to a 13"x11"x3.5" 
radiator in the strake.

http://ernest.isa-geek.org/Delta/Pictures/Radiator.jpg
http://ernest.isa-geek.org/Delta/Pictures/RadiatorDuctFront.jpg
http://ernest.isa-geek.org/Delta/Pictures/RadiatorDuctTop.jpg
http://ernest.isa-geek.org/Delta/Pictures/RadiatorDuctTopFront.jpg

Fabric ducts carry the exit air to a composite shark-gill exit on the top of the 
strake that is integrated with the retractable main gear's wheel well.  I made 
the shark-gill vent louvres part of the strake skin, but I decided that it makes 
maintenance of other things a nightmare.  I cut them out, joined the top skin 
with the wheel well, and will build a removable vent cover "any day now".

http://ernest.isa-geek.org/Delta/Pictures/FabricDuct5.jpg
http://ernest.isa-geek.org/Delta/Pictures/FabricDuct6.jpg
http://ernest.isa-geek.org/Delta/Pictures/FabricDuct7.jpg
http://ernest.isa-geek.org/Delta/Pictures/FabricDuct8.jpg
http://ernest.isa-geek.org/Delta/Pictures/RightFuselageTopSkin3.jpg
http://ernest.isa-geek.org/Delta/Pictures/airpath.jpg
http://ernest.isa-geek.org/Delta/Pictures/CoolingAirExitGillsRemoved.jpg

The other leg of the pump, I turned around to face forward.  I'll have a smaller 
heat exchanger in the engine bay.  I haven't even started on that yet, except 
that I have a candidate radiator core.  The coolant returns to a homemade 
backflow preventing Y joint that I made up from pieces of aluminum NPT fittings 
(McMaster Carr).  3/4" from the radiators, and 1" back out to the engine.

http://ernest.isa-geek.org/Delta/Pictures/DSCF1387.JPG
http://ernest.isa-geek.org/Delta/Pictures/DSCF1389.JPG
http://ernest.isa-geek.org/Delta/Pictures/DSCF1390.JPG
http://ernest.isa-geek.org/Delta/Pictures/DSCF1392.JPG

The hoses come into the engine with an aluminum block, drilled and tapped for 1" 
NPT hose nipples.  I got two elbows from Autozone and the filler neck is made 
from more McMaster-Carr aluminum pipe fittings: one 1" NPT Tee, two 1"NPT 
nipples, one 1"x6" NPT pipe.  A chunk of 1/4" 6061 plate, drilled and tapped for 
1"NPT gave me something to mount the filler cap to.  A couple of aluminum sheet 
pieces connect the filler neck to the firewall.

http://ernest.isa-geek.org/Delta/Pictures/EngineFirewallForward_Feb2008.jpg

The oversized lines act as my reservoir.  The filler neck will be left mostly 
empty, providing the "pressure spring" that Al Wick champions.  The water will 
vent overboard, just to the side of the canopy, if the engine overheats 
(providing an respectable "Oh! Sh!!" factor).

Writing this up, I notice that I don't have much pictorial detail of this setup 
on my website.  I'll attempt to rectify that situation "real soon now".