From: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: cowl temps
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Date: Mon, 12 Jan 2015 16:11:29 +0800
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Thanks again for the feedback guys.

Appreciated.

Steve
> On 12 Jan 2015, at 1:40 pm, Christian And Tam =
<flyrotary@lancaironline.net> wrote:
>=20
> Hi Steve=20
> I've found that my Rv cowl used to get quite hot as well after =
shutdown but I added more vents to release the heat out the bottom and =
problem solved even after shutdown didn't get no where as warm as it did =
previously
> In flight I had noticed it was hot under cowl as alternator was =
starting to wain and after shutdown cowls on top were extremely hot
> Installed vents in bottom of cowl underneath and problem solved
>=20
> Cheers
> Christian
>=20
> Sent from my iPhone
>=20
>> On 12 Jan 2015, at 11:59 am, Charlie England =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Forgot to mention, I would think that you have prettyv big unknowns =
with no prop. Should be minimal load on the engine at 1500 rpm, but it =
will be at least some load. And without the prop, everything inside the =
cowl will heat soak a lot worse because there's no airflow through the =
cowl. Which matters more? I don't know.
>>=20
>> Charlie
>>=20
>>> On 1/11/2015 4:25 PM, Stephen Izett wrote:
>>> Thanks people.
>>> I suppose i should measure the temps and check against the glass =
specs, but perhaps all OK.
>>>=20
>>> Steve
>>>=20
>>>=20
>>>> On 12 Jan 2015, at 12:53 am, Mark Steitle =
<flyrotary@lancaironline.net> wrote:
>>>>=20
>>>> Steve,
>>>> The cowl on my 3-rotor would get too hot to touch after shutdown. I =
coated the area around the exhaust with a layer of Fiberfrax... Problem =
solved.  Some builders have used aluminum foil to reflect the heat away =
from the fiberglass cowl.
>>>>=20
>>>> Mark S.
>>>>=20
>>>>=20
>>>> Sent from my iPad
>>>>=20
>>>>> On Jan 11, 2015, at 7:24 AM, steve Izett =
<flyrotary@lancaironline.net> wrote:
>>>>>=20
>>>>> Hi Guys
>>>>>=20
>>>>> Ive finally got the engine (Renesis) and cowl complete on the =
Glasair.
>>>>> Now without a prop I can run her (1500rpm, 90 deg F ambient) for =
about 10 mins before water temps teach 200 deg F.
>>>>> Hoping that with the prop she will keep her cool.
>>>>>=20
>>>>> We have sought to protect the inner cowl surfaces from exhaust =
radiant heat and this appears to be functioning
>>>>> however I=E2=80=99m surprised at the upper cowl external surface =
temps after shut down getting to hot to touch.
>>>>> What are your experiences of cowl temps after shutdown?
>>>>> If air-cooled engines run up to 400 deg F CHT=E2=80=99s how do =
they go?
>>>>> I take it we all have glass cowls!
>>>>>=20
>>>>> Steve Izett
>>>>>=20
>>>>>=20
>>>>> --
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>>=20
>>=20
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>=20
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