flyrotary@lancaironline.net Mailing List Archive

Relocating the radiators is a GOOD idea. You can eliminate a lot of additional drag. The P-51 was reputedly a net zero loss for cooling drag, which is pretty darn good really. The only thing bad about the idea is that you must plumb it up well too. Many of the engines we run don't have a really great water pump either so you might consider a remote mount version, which unfortunately also adds to complication. A good mechanical water pump will absorb nearly 5 HP at max rpm. You must also consider the effects on the weight and balance. Nearly every water cooled WW2 fighter that was considered a success mounted the water rads in the fuselage or in or under the wings.
Bill jepson

-----Original Message-----
From: George Lendich <lendich@optusnet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 15 Nov 2007 9:11 pm
Subject: [FlyRotary] Re: heat exchanger placement

> Hi > Following on from this thin vs thick radiator discussion. What's the
> general consensus on placement of the heat exchanger/s? Seems to me the
> most efficient WW11 planes had the exchangers mounted under the wing or
> fuselage but nearly everyone here is placing them under the cowl, is the
> reason for this just because its an easier installation to make, or is
> it no less efficient at our power/speed.
> My aim is to minimize total drag even if it means a longer build time to
> get the installation correct, current thoughts are to place a short
> thick coolant exchanger under the fuselage and have a clean tight
> fitting cowl with only inlets for induction and oil heat exchanger,
> hopefully there will be enough air going through the oil exchanger to
> keep under cowl temps reasonable. > Am I just plane crazy?
> Regards Andrew Martin.

Andrew, The extra plumbing seems to be one problem.
George ( down under)

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