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Forgot to mention, I would think that you have pretty 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.
Charlie
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.
Steve
On 12 Jan 2015, at 12:53 am, Mark Steitle <flyrotary@lancaironline.net> wrote:
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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