From: "Christian And Tam" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: cowl temps
Message-Id: <738D5597-1505-4BC6-BF6A-62E5DC592CC7@gmail.com>
Date: Mon, 12 Jan 2015 15:40:14 +1000
References: <list-7410304@logan.com>
In-Reply-To: <list-7410304@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

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 w=
ain and after shutdown cowls on top were extremely hot
Installed vents in bottom of cowl underneath and problem solved

Cheers
Christian

Sent from my iPhone

> 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 n=
o prop. Should be minimal load on the engine at 1500 rpm, but it will be at l=
east some load. And without the prop, everything inside the cowl will heat s=
oak a lot worse because there's no airflow through the cowl. Which matters m=
ore? 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, b=
ut perhaps all OK.
>>=20
>> Steve
>>=20
>>=20
>>> On 12 Jan 2015, at 12:53 am, Mark Steitle <flyrotary@lancaironline.net> w=
rote:
>>>=20
>>> Steve,
>>> The cowl on my 3-rotor would get too hot to touch after shutdown. I coat=
ed 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 fib=
erglass cowl.
>>>=20
>>> Mark S.
>>>=20
>>>=20
>>> Sent from my iPad
>>>=20
>>>> On Jan 11, 2015, at 7:24 AM, steve Izett <flyrotary@lancaironline.net> w=
rote:
>>>>=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 1=
0 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 h=
eat and this appears to be functioning
>>>> however I=E2=80=99m surprised at the upper cowl external surface temps a=
fter 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
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t.html
>=20
>=20
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