Frans=2C
Could you give us the details and source of the thin radiator ?Many thanks.
Karl
> Date: Thu=2C 4 Oct 2012 22:56:17 +0200
> From: frans@privatepilots.nl
> To: europa-list@matronics.com
> Subject: Re: [Spam] Europa-List: New to List
>
>
> On 10/04/2012 01:34 PM=2C Paul McAllister wrote:
>
> > As to cooling. I have extensively modified my cooling with cowl flaps
=2C
> > lamovia heat exchanger=2C diffused inlets=2C intercooler and internal
> > ducting. I have spent 12 months over 3 winters and countless hours on
> > this and although I am close=2C its still not right. I would encourage
> > you to think carefully before getting into complex modifications.
>
> Well=2C at least we can now tell what won't work.
>
> The main thing we found is that no matter what you try=2C the original
> coolant radiator is just to thick to get both a decent low drag and
> efficient air flow through it. Replace it with a thin radiator (as in
> *every* commercial Rotax application I have seen) and from there you can
> just optimize the cooling system by recycling the exit air for cowling
> and turbo cooling and applying an adjustable cowl flap for temperature
> regulation=2C and optimizing inlet and outlet for minimal drag. It will
> give you superb cooling and add some knots to your airspeed at the same
> time.
>
> > It you really want to get into this then don't do what I did=2C take a
> > look at Fran's solution=2C but plan on adding 6 months to your build.
>
> Thanks! Well=2C 6 months is a little bit exaggarated once you know how to
> do it=2C but of course you need to extensively modify the cowling=2C and
> depending on your skills and experience this will take more or less
> time. I had no prior experience in modelling and building shapes=2C but
> once I got the hang of it I could work pretty fast. Before I got it
> right I built a dozen or so diffusing air inlets (in fruitless attempts
> to get sufficient airflow through the thick radiator). The end result
> with a thin radiator in line with the cowling belly is surprisingly
> easy=2C much easier to build than all the carefully calculated and shaped
> diffusers. Take a look at the Rotax equipped Diamond airplanes (super
> Dimona=2C Katana) to get some inspiration.
> I used a Laminova heat exchanger so I only had to care about cooling of
> the coolant.
>
> Frans
>
>
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