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Message-ID: <1c23473f05072006104dab8ae1@mail.gmail.com>
Date: Wed, 20 Jul 2005 06:10:53 -0700
From: David Leonard <wdleonard@gmail.com>
Reply-To: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Evans Coolant
In-Reply-To: <list-181214@logan.com>
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On 7/19/05, Al Gietzen <ALVentures@cox.net> wrote:=20
>=20
>  Dave;=20
>=20
> At some point you might share your observations of Evans coolant vs water=
,=20
> and why you switched back.
>=20
>  I have not completely given up on the Evans. Best I can tell my temps ar=
e=20
20-40 deg warmer with the evans but that is really hard to tell because I=
=20
only have 2 brief flights with water and the new intake. There are a lot of=
=20
confounding variables and my temp sensor only has a resolution of 10 deg C.=
=20
With the Evans I saw cruise temps of 230, climb temps of 250. No apparent=
=20
ill effects from those temps=20
 I switched back to water to eliminate the evans as a possible cause for=20
this loss of power thing I have been experiencing. I still attribute it to=
=20
compressor surge except for the fact that coolant temp seems to play a role=
.=20
Although it is still there, I did see an improvement in my last brief fligh=
t=20
but I attribute that to opening up the waste gate rather than the switch=20
back to water.
 I kept the evans and will probably put it back in this winter after some=
=20
more experience with the water and new set up.
 The big question is: since the drive is going back to Tracy soon, should I=
=20
switch to the RD-1C or stick with the B-model?
 --=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html

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<br><br>
<div><span class=3D"gmail_quote">On 7/19/05, <b class=3D"gmail_sendername">=
Al Gietzen</b> &lt;<a href=3D"mailto:ALVentures@cox.net">ALVentures@cox.net=
</a>&gt; wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Dave;&nbsp;</span></font><font =
face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZE: 11pt; =
COLOR: blue; FONT-FAMILY: Verdana">
&nbsp;</span></font></p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">At some point you might share y=
our observations of Evans coolant vs water, and why you switched back.</spa=
n></font>
</p>
<p><font face=3D"Verdana" color=3D"blue" size=3D"2"><span style=3D"FONT-SIZ=
E: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p></div><=
/blockquote>
<div>I have not completely given up on the Evans.&nbsp; Best I can tell my&=
nbsp;temps are 20-40 deg warmer with the evans but that is really hard to t=
ell because I only have&nbsp;2 brief flights with water and&nbsp;the new in=
take.&nbsp; There are&nbsp;a lot of confounding variables and my temp senso=
r only has a resolution of 10 deg C.&nbsp; With the Evans I saw cruise temp=
s of 230, climb temps of 250.&nbsp; No apparent ill effects from those temp=
s&nbsp;=20
</div>
<div>&nbsp;</div>
<div>I&nbsp;switched back to water to eliminate the evans as a possible cau=
se for this loss of power thing I have been experiencing.&nbsp; I still att=
ribute it to&nbsp;compressor surge&nbsp;except for&nbsp;the&nbsp;fact that&=
nbsp;coolant temp seems to play a role.&nbsp; Although it is still there, I=
 did see an improvement in my last brief flight but I attribute that to ope=
ning up the waste gate rather than the switch back to water.
</div>
<div>&nbsp;</div>
<div>I kept the evans and will probably put it back in this winter after so=
me more experience with the water and new set up.</div>
<div>&nbsp;</div>
<div>The big question is: since the drive is going back to Tracy soon, shou=
ld I switch to the RD-1C or stick with the B-model?</div>
<div>&nbsp;</div>
<div>-- <br>Dave Leonard<br>Turbo Rotary RV-6 N4VY<br><a href=3D"http://mem=
bers.aol.com/_ht_a/rotaryroster/index.html">http://members.aol.com/_ht_a/ro=
taryroster/index.html</a><br><a href=3D"http://members.aol.com/vp4skydoc/in=
dex.html">
http://members.aol.com/vp4skydoc/index.html</a> </div></div>

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