From: "Rob McMillan robmcmillanpls@gmail.com" <flyrotary@lancaironline.net>
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References: <list-3618868@lancaironline.net>
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Date: Sat, 12 Oct 2024 12:38:14 -0700
Message-ID: <CAJckkgM5B5yMM9r2xh_T7Dr6u=53EL05PPiaDyNmU7CXUqtu_A@mail.gmail.com>
Subject: Re: [FlyRotary] Re: RV-9A w13B Update
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Dumb Question here!

Why don't we put cooling on the top of the cowl?

Seems like the heat would come out better...


On Sat, Oct 12, 2024, 11:50=E2=80=AFAM David COOK hoursaway1@comcast.net <
flyrotary@lancaironline.net> wrote:

> Cowl on for cooling tests. We had good #s with it off then found not
> enough airflow with cowl on and had to add some out-venting to the bottom
> of the cowl with simple SS marine louvers. David
>
> On 10/11/2024 9:15 PM EDT Doug Lomheim rv9flyer13b@gmail.com <
> flyrotary@lancaironline.net> wrote:
>
>
> I now have 4.2 hrs. of ground run time on the 13B I rebuilt in Feb/Mar,
> and will now drop the oil and replace with Mobile One and keep exploring
> the upper limits of the power band!  I got a bit carried away today and
> pushed it up to 25 inches, and had to go full rich, so will have to tweak
> the EC2 some more above 16 inches.  So far I=E2=80=99m very happy with th=
e temps
> while doing the ground runs, and with OATs from 90-95 degrees, the max
> water temp has been 178 degrees, and oil temp only 148.  I=E2=80=99ve bee=
n able to
> run 30 minutes straight without a cowling, without any temp issues, so am
> wondering if I=E2=80=99m going to be too cool once I start flying it??  :=
)
>
> Doug
>
> [image: IMG_9906.jpg]
>
>

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<div dir=3D"auto">Dumb Question here!=C2=A0<div dir=3D"auto"><br></div><div=
 dir=3D"auto">Why don&#39;t we put cooling on the top of the cowl?</div><di=
v dir=3D"auto"><br></div><div dir=3D"auto">Seems like the heat would come o=
ut better...</div><div dir=3D"auto"><br></div></div><br><div class=3D"gmail=
_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 12, 2024, 11:50=
=E2=80=AFAM David COOK <a href=3D"mailto:hoursaway1@comcast.net">hoursaway1=
@comcast.net</a> &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrota=
ry@lancaironline.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><u></u>

 =20
  =20
=20
 <div>
  <div style=3D"font-size:12pt;font-family:helvetica,arial,sans-serif;color=
:#333333">
   <span style=3D"font-family:helvetica;font-size:12pt">Cowl on for cooling=
 tests. We had good #s with it off then found not enough airflow with cowl =
on and had to add some out-venting to the bottom of the cowl with simple SS=
 marine louvers. David</span>
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    On 10/11/2024 9:15 PM EDT Doug Lomheim <a href=3D"mailto:rv9flyer13b@gm=
ail.com" target=3D"_blank" rel=3D"noreferrer">rv9flyer13b@gmail.com</a> &lt=
;<a href=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank" rel=3D"no=
referrer">flyrotary@lancaironline.net</a>&gt; wrote:
   </div>=20
   <div>
    =C2=A0
   </div>=20
   <div>
    =C2=A0
   </div>=20
   <div>
    <span style=3D"font-size:large">I now have 4.2 hrs. of ground run time =
on the 13B I rebuilt in Feb/Mar, and will now drop the oil and replace with=
 Mobile One=C2=A0and keep exploring the upper limits of the power band!=C2=
=A0 I got a bit carried away today and pushed it up to 25 inches, and had t=
o go full rich, so will have to tweak the EC2 some more above 16 inches.=C2=
=A0 So far I=E2=80=99m very happy with the temps while doing the ground run=
s, and with OATs from 90-95 degrees, the max water temp has been 178 degree=
s, and oil temp only 148.=C2=A0 I=E2=80=99ve been able to run 30 minutes=C2=
=A0straight=C2=A0without a cowling, without any temp issues, so am wonderin=
g if I=E2=80=99m going to be too cool once I start=C2=A0flying it?? =C2=A0:=
) =C2=A0</span>
   </div>=20
   <div>
    <span style=3D"font-size:large">=C2=A0</span>
   </div>=20
   <div>
    <span style=3D"font-size:large">Doug=C2=A0</span>
   </div>=20
   <div>
    =C2=A0
   </div>=20
   <img id=3D"m_8768861031476173931&lt;FF2E7F11-C6BD-4199-91CB-E42F60AC1DB4=
&gt;" style=3D"opacity:1" alt=3D"IMG_9906.jpg">
  </blockquote>
 </div>
</blockquote></div>

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