Received-SPF: pass
 receiver=logan.com; client-ip=209.86.89.69; envelope-from=jerryhey@earthlink.net
DomainKey-Signature: a=rsa-sha1; q=dns; c=simple;
  s=test1; d=earthlink.net;
  h=Date:Subject:Content-Type:Mime-Version:From:To:In-Reply-To:Message-Id:X-Mailer;
  b=OsUEfHAu3QJEO3Ler5wYXx9mrmv/MylMljKQS/hkdjAheEe+LJqIKp9bRkz/NvrP;
Date: Thu, 7 Apr 2005 06:58:08 -0500
Subject: Re: [FlyRotary] Re: rule of thumb and RV-3 sizes-   was Cooling Inlet Areas/Bernie's RV9
Content-Type: multipart/alternative; boundary=Apple-Mail-2--723581403
Mime-Version: 1.0 (Apple Message framework v552)
From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-860256@logan.com>
Message-Id: <4EB6AAB8-A75C-11D9-A7A3-0003931B0C7A@earthlink.net>


--Apple-Mail-2--723581403
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=ISO-8859-1;
	format=flowed

Bill,  would you agree that more air is more important than more=20
radiator?  This would explain why smaller systems are functioning=20
better than predicted. Given the space available in most aircraft down=20=

sizing the radiator is important.  How small can we go?     Jerry


On Thursday, April 7, 2005, at 06:33 AM, William wrote:

> The amount of heat rejected is very similiar, however the delta-T=20
> available to drive the heat into the air is less for the Rotary than=20=

> for the air cooled engine because of the temperature limitations of=20
> the water cooling circuit. Therefore we cannot heat the air as hot,=20
> and therefore need more air than for a direct air-cooled engine.
> Bill Schertz
> KIS Cruiser # 4045
>
> ----- Original Message -----
> From: rijakits
> To: Rotary motors in aircraft
> Sent: Wednesday, April 06, 2005 9:43 PM
> Subject: [FlyRotary] Re: rule of thumb and RV-3 sizes- was Cooling=20
> Inlet Areas/Bernie's RV9
>
> snip
>
> I mentioned that on the other list, but I was dismissed as " you can't=20=

> compare aircooled engines with a rotary".
> I don't think there is a great difference on the amout of cooling=20
> necessary, as the efficiency of both engines are fairly close. So some=20=

> heat goes out the exhaust and the rest has to be cooled.=A0For sure =
you=20
> need different ducting, but the amount of heat energy should be about=20=

> the same and you want to get rid of it with the least drag, either > =
way.
> =A0
> =A0
> snip[
> =A0
>

--Apple-Mail-2--723581403
Content-Transfer-Encoding: quoted-printable
Content-Type: text/enriched;
	charset=ISO-8859-1

Bill,  would you agree that more air is more important than more
radiator?  This would explain why smaller systems are functioning
better than predicted. Given the space available in most aircraft down
sizing the radiator is important.  How small can we go?     Jerry


On Thursday, April 7, 2005, at 06:33 AM, William wrote:


<excerpt>The amount of heat rejected is very similiar, however the
delta-T available to drive the heat into the air is less for the
Rotary than for the air cooled engine because of the temperature
limitations of the water cooling circuit. Therefore we cannot heat the
air as hot, and therefore need more air than for a direct air-cooled
engine.

Bill Schertz

KIS Cruiser # 4045


----- Original Message -----

<bold>From:</bold>
=
<underline><color><param>1999,1999,FFFF</param>rijakits</color></underline=
>

<bold>To:</bold> <underline><color><param>1999,1999,FFFF</param>Rotary
motors in aircraft</color></underline>

<bold>Sent:</bold> Wednesday, April 06, 2005 9:43 PM

<bold>Subject:</bold> [FlyRotary] Re: rule of thumb and RV-3 sizes-
was Cooling Inlet Areas/Bernie's RV9


snip


I mentioned that on the other list, but I was dismissed as " you can't
compare aircooled engines with a rotary".

I don't think there is a great difference on the amout of cooling
necessary, as the efficiency of both engines are fairly close. So some
heat goes out the exhaust and the rest has to be cooled.=A0For sure you
need different ducting, but the amount of heat energy should be about
the same and you want to get rid of it with the least drag, either way.

=A0

=A0

snip[

=A0


</excerpt>=

--Apple-Mail-2--723581403--