From: "David COOK hoursaway1@comcast.net" <flyrotary@lancaironline.net>
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Date: Sat, 12 Oct 2024 16:30:41 -0400 (EDT)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <2000990416.464619.1728765041594@connect.xfinity.com>
In-Reply-To: <list-3618912@lancaironline.net>
References: <list-3618912@lancaironline.net>
Subject: Re: [FlyRotary] Re: RV-9A w13B Update
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Don't know if you've flown anything with a large high cowl but you can't se=
e in the flair, need to look to the side kinda with peripheral vision and u=
se judgement for touchdown. Ask the Corsair drivers. Want to keep cowl as c=
lose to upper part of eng. so that leaves little room. Sides and bottom is =
best. Ours is RV6A with standard exit out the bottom rear and already has s=
tuff in the way, 3" exhaust pipe, parts of the eng. mount. Start to add up =
how much area is actually there and we were lacking, we had much more in th=
an out, so we added two 6"x6" louvers to bottom rear, then added two more a=
fter testing, we knew we were on the right trac.

> On 10/12/2024 3:38 PM EDT Rob McMillan robmcmillanpls@gmail.com <flyrotar=
y@lancaironline.net> wrote:
> =20
> =20
> Dumb Question here!=20
> =20
> Why don't we put cooling on the top of the cowl?
> =20
> Seems like the heat would come out better...
> =20
>=20
> On Sat, Oct 12, 2024, 11:50=E2=80=AFAM David COOK hoursaway1@comcast.net =
mailto:hoursaway1@comcast.net <flyrotary@lancaironline.net mailto:flyrotary=
@lancaironline.net> wrote:
>=20
> > Cowl on for cooling tests. We had good #s with it off then found not en=
ough airflow with cowl on and had to add some out-venting to the bottom of =
the cowl with simple SS marine louvers. David
> >=20
> > > On 10/11/2024 9:15 PM EDT Doug Lomheim rv9flyer13b@gmail.com mailto:r=
v9flyer13b@gmail.com <flyrotary@lancaironline.net mailto:flyrotary@lancairo=
nline.net> wrote:
> > > =20
> > > =20
> > > I now have 4.2 hrs. of ground run time on the 13B I rebuilt in Feb/Ma=
r, 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 pu=
shed 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 the tem=
ps while doing the ground runs, and with OATs from 90-95 degrees, the max w=
ater temp has been 178 degrees, and oil temp only 148.  I=E2=80=99ve been a=
ble 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?=
?  :) =20
> > > =20
> > > Doug=20
> > > =20
> > > [IMG_9906.jpg]
> > >=20
> >=20
>=20

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<!doctype html>
<html>
 <head>=20
  <meta charset=3D"UTF-8">=20
 </head>
 <body>
  <div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; c=
olor: #333333;">
   <span style=3D"font-family: helvetica; font-size: 12pt;">Don't know if y=
ou've flown anything with a large high cowl but you can't see in the flair,=
 need to look to the side kinda with peripheral vision and use judgement fo=
r touchdown. Ask the Corsair drivers. Want to keep cowl as close to upper p=
art of eng. so that leaves little room. Sides and bottom is best. Ours is R=
V6A with standard exit out the bottom rear and already has stuff in the way=
, 3" exhaust pipe, parts of the eng. mount. Start to add up how much area i=
s actually there and we were lacking, we had much more in than out, so we a=
dded two 6"x6" louvers to bottom rear, then added two more after testing, w=
e knew we were on the right trac.</span>
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    On 10/12/2024 3:38 PM EDT Rob McMillan robmcmillanpls@gmail.com &lt;fly=
rotary@lancaironline.net&gt; wrote:
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div dir=3D"auto">
    Dumb Question here!&nbsp;=20
    <div dir=3D"auto">
     &nbsp;
    </div>=20
    <div dir=3D"auto">
     Why don't we put cooling on the top of the cowl?
    </div>=20
    <div dir=3D"auto">
     &nbsp;
    </div>=20
    <div dir=3D"auto">
     Seems like the heat would come out better...
    </div>=20
    <div dir=3D"auto">
     &nbsp;
    </div>=20
   </div>=20
   <br>=20
   <div class=3D"gmail_quote">=20
    <div class=3D"gmail_attr" dir=3D"ltr">
     On Sat, Oct 12, 2024, 11:50=E2=80=AFAM David COOK <a href=3D"mailto:ho=
ursaway1@comcast.net">hoursaway1@comcast.net</a> &lt;<a href=3D"mailto:flyr=
otary@lancaironline.net">flyrotary@lancaironline.net</a>&gt; wrote:
    </div>=20
    <blockquote>
     <u></u>=20
     <div>=20
      <div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-seri=
f; 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 wi=
th cowl on and had to add some out-venting to the bottom of the cowl with s=
imple 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:rv9flyer13=
b@gmail.com" target=3D"_blank" rel=3D"noopener">rv9flyer13b@gmail.com</a> &=
lt;<a href=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank" rel=3D"=
noopener">flyrotary@lancaironline.net</a>&gt; wrote:
       </div>=20
       <div>
        &nbsp;
       </div>=20
       <div>
        &nbsp;
       </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 replac=
e with Mobile One&nbsp;and keep exploring the upper limits of the power ban=
d!&nbsp; 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 inche=
s.&nbsp; So far I=E2=80=99m very happy with the temps while doing the groun=
d runs, and with OATs from 90-95 degrees, the max water temp has been 178 d=
egrees, and oil temp only 148.&nbsp; I=E2=80=99ve been able to run 30 minut=
es&nbsp;straight&nbsp;without a cowling, without any temp issues, so am won=
dering if I=E2=80=99m going to be too cool once I start&nbsp;flying it?? &n=
bsp;:) &nbsp;</span>
       </div>=20
       <div>
        <span style=3D"font-size: large;">&nbsp;</span>
       </div>=20
       <div>
        <span style=3D"font-size: large;">Doug&nbsp;</span>
       </div>=20
       <div>
        &nbsp;
       </div>=20
       <img id=3D"m_8768861031476173931<FF2E7F11-C6BD-4199-91CB-E42F60AC1DB=
4>" style=3D"opacity: 1;" alt=3D"IMG_9906.jpg">
      </blockquote>=20
     </div>=20
    </blockquote>=20
   </div>=20
  </blockquote>
 </body>
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