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.  

Mark S.


Sent from my iPad

> On Jan 11, 2015, at 7:24 AM, steve Izett <flyrotary@lancaironline.net> wrote:
>
> Hi Guys
>
> 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.
>
> We have sought to protect the inner cowl surfaces from exhaust radiant heat and this appears to be functioning
> however I’m 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’s how do they go?
> I take it we all have glass cowls!
>
> Steve Izett
>
>
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