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Message-ID: <1c23473f0709112204i7ff59bedg539c8fe924e796c3@mail.gmail.com>
Date: Tue, 11 Sep 2007 22:04:28 -0700
From: "David Leonard" <wdleonard@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: How cool is too cool?
In-Reply-To: <list-2325831@logan.com>
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> David,
> The standard reply is that the water is best at around 190=B0F so the
> entrapped water will boil off at least. Running any modern detergent oil,
> and particularly a synthetic you shouldn't have a sluge problem. If you
> never hit 200 I might worry, but you should be fine. You could make the c=
owl
> opening smaller if you have nothing to do! A better fix may eventually be=
 a
> smaller cooler, but to take advantage of the lower drag you will need a n=
ew
> smaller duct as well. Leave it alone for now. If you really worry get an =
oil
> thermostat bypass.
> Sounds like you have plenty of inlet area, how many sq inches?
> Bill Jepson
>
>
I lost my exact calculations, but the rad scoop is about the same area as
the 2 stock RV inlets combined (which I also use for oil and intercooler).
I do have a nice big cowl flap installed.  Those temps are with the cowl
flap 'closed' the the neutral position.  My first step is going to be to
adjust the travel on the cowl flap so I can pinch the air a little on the
way out.

--=20
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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<br><div><blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid =
rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div sty=
le=3D"font-size: 10pt; color: rgb(0, 0, 0); font-family: Arial;"><font colo=
r=3D"#000000" face=3D"Arial" size=3D"2">
<span class=3D"q"><div></div></span>
</font><div><font color=3D"#000000" face=3D"Arial" size=3D"2">David,</font>=
</div>
<div><font color=3D"#000000" face=3D"Arial" size=3D"2">The standard reply i=
s that the water is best at around 190=B0F so the=20
entrapped water will boil off at least. Running any modern detergent oil, a=
nd=20
particularly a synthetic you shouldn&#39;t have a sluge problem. If you nev=
er hit=20
200 I might worry, but you should be fine. You could make the cowl opening=
=20
smaller if you have nothing to do! A better fix may eventually be a smaller=
=20
cooler, but to take advantage of the lower drag you will need a new smaller=
 duct=20
as well. Leave it alone for now. If you really worry get an oil thermostat=
=20
bypass.</font></div>
<div><font color=3D"#000000" face=3D"Arial" size=3D"2">Sounds like you have=
 plenty of inlet area, how many sq inches?</font></div>
<div><font color=3D"#000000" face=3D"Arial" size=3D"2">Bill Jepson</font></=
div><br></div></blockquote></div><br>I lost my exact calculations, but the =
rad scoop is about the same area as the 2 stock RV inlets combined (which I=
 also use for oil and intercooler).&nbsp; I do have a nice big cowl flap in=
stalled.&nbsp; Those temps are with the cowl flap &#39;closed&#39; the the =
neutral position.&nbsp; My first step is going to be to adjust the travel o=
n the cowl flap so I can pinch the air a little on the way out.=20
<br><br>-- <br>David Leonard<br><br>Turbo Rotary RV-6 N4VY<br><a href=3D"ht=
tp://N4VY.RotaryRoster.net">http://N4VY.RotaryRoster.net</a><br><a href=3D"=
http://RotaryRoster.net">http://RotaryRoster.net</a>

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