Mailing List flyrotary@lancaironline.net Message #63663
From: Andrew Martin <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Elec Rad Fans
Date: Tue, 22 Aug 2017 11:08:18 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Steve, I don't think they are really an option, not much heat is generated at idle/taxi speeds, just weight and drag you don't need. other aspects will be at play like your exits etc.
There was tufting put inside a Bonanza cowl a few years back which showed complete reversal of flow through the cowl, explained why it would cool better on the ground with wind up its ass. prop probably sucking the air out.
I think this airflow stuff is sometimes dark magic.
Andrew

Regards

Andrew Martin

+61 0427477144
+61 8 6365 5648
+61 8 9924 1145
andrew@martinag.com.au




On Tue, Aug 22, 2017 at 10:08 AM, steve Izett <flyrotary@lancaironline.net> wrote:
Hi Guys
I seam to remember way back something being said about elect fans on exchangers in aircraft.
The reason for my question is if your prop doesn’t have very good blades for pushing air in tight to the spinner would an elec be helpful for sitting and taxiing?
My concern would be restriction of the incoming air once at speed and how it would go at high air speeds even with a good diffuser.
Has anyone ever used one?
I tried to emulate tracy’s 20b setup on the Renesis 4port 
I’ve got 540CI of Water cooler and 193CI of Oil cooler (out of RX7 turbo from memory)


Steve Izett


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