Actually I don’t have any really good pictures because I took it apart … but attached is a side-view after removal of the inlet diffuser on top and also a sketch
of approximate scale and shape of what I tried to make, (I don’t have a damper plate or cowl flap yet). The top shape isn’t quite right; needs to be pinched more at the rear, also am considering a turning vane to direct more air through the front half. Trying
to make air bend 90 degrees twice isn’t easy but I chose this orientation because of the desire to add a damper at the output for winter operations. I could drop the rear of radiator and bring air in through the bottom, spilling out over the engine but would
lose the ability to have a damper – I don’t like the idea of inlet dampers. On top of it all, my climb speed is usually only 90 mph; I don’t have the ability to get extra pressure from increased airspeed. P.S. the radiator is the Griffin 2-58185-X, same
as several other installs on this list.
The top plenum was out in the SUV; hopefully more attachments in next post …
Jeff
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Sorry to hear that Jeff. My apologies if you have already posted pictures of the your installation and the diffuser, but could you post some now?
Dave Leonard
On Fri, May 15, 2015 at 8:19 AM, Jeff Whaley <flyrotary@lancaironline.net> wrote:
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From: Jeff Whaley
Sent: Friday, May 15, 2015 11:19 AM
To: 'Bobby J. Hughes'
Subject: Return to Flight - 2
Well, the second flight occurred last night with same results as before; one short low-level circuit due to insufficient cooling … looks like Al Wick made the
correct prediction.
There are 3 things I can try with the current configuration: 1) Increase inlet area 2) Increase outlet area (adjustable cowl flap) 3) Re-profile the pinched
diffuser. I will do all 3 and see what happens.
If all of the above show remarkable improvement then repositioning the radiator is the only alternative.
Jeff
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