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From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Sat, 3 Jul 2021 16:51:45 -0400
Message-ID: <CAP-UEKsyEbWCBGK9jAC3ytXf09RGQprJNB=cv0DZ5zcH+OjTbw@mail.gmail.com>
Subject: Re: [FlyRotary] Butterfly cowl flap
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I don't have any cowl flaps at the moment. But want to design something to
try to start to optimize the cowl for speed.

- Matt Boiteau


On Wed, Jun 30, 2021 at 11:08 PM Finn Lassen finn.lassen@verizon.net <
flyrotary@lancaironline.net> wrote:

> I read through all posts since 2010 containing "cowl flap".
>
> Both Carlie and Matt mentioned butterfly cowl flap.
>
> I understand it's hinged in the middle, but having a hard time
> visualizing it. When open, is the front then lowered into the outside
> air stream? If so, doesn't the rear part of the flap then block the
> opening from inside to outside of cowling?
>
> If the front instead opens into the cowl (and rear down into the outside
> air stream), doesn't the front then block the air inside the cowling. Or
> maybe that's just a problem for me because my oil cooler goes all the
> way down to the bottom of the cowling ...
>
> Any pictures?
>
> Finn
>
> ---
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<div dir=3D"ltr">I don&#39;t have any cowl flaps at the moment. But want to=
 design something to try to start to optimize=C2=A0the cowl for speed.<div>=
<br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signature" data-smar=
tmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr">- Matt Boi=
teau</div></div></div></div></div><br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jun 30, 2021 at 11:08 P=
M Finn Lassen <a href=3D"mailto:finn.lassen@verizon.net">finn.lassen@verizo=
n.net</a> &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrotary@lanc=
aironline.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">I read through all posts since 2010 containing &quot;cowl flap=
&quot;.<br>
<br>
Both Carlie and Matt mentioned butterfly cowl flap.<br>
<br>
I understand it&#39;s hinged in the middle, but having a hard time <br>
visualizing it. When open, is the front then lowered into the outside <br>
air stream? If so, doesn&#39;t the rear part of the flap then block the <br=
>
opening from inside to outside of cowling?<br>
<br>
If the front instead opens into the cowl (and rear down into the outside <b=
r>
air stream), doesn&#39;t the front then block the air inside the cowling. O=
r <br>
maybe that&#39;s just a problem for me because my oil cooler goes all the <=
br>
way down to the bottom of the cowling ...<br>
<br>
Any pictures?<br>
<br>
Finn<br>
<br>
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</blockquote></div>

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