Steve, the 60 kt sustained climb sounds encouraging.  What is your power setting for a 60 kt (69 mph) sustained climb?
Jeff



Jeff,

The air enters the wide end of the Vee.  The location of the inlet is far enough from the center of the prop that the velocity of the air entering the duct is always greater than the airframe TAS.  Slow flight and climbs at ~60 Kt can be maintained indefinitely although I don't like to do this because of the high deck angle.

Steve

-----Original Message-----
From: Jeff Whaley
Sent: July-31-18 2:58 PM
To: 'Rotary motors in aircraft'
Subject: RE: Using Fluidyne oil coolers as Primary Radiator

Charlie: Yeah my drawing isn't too good -- done free-hand with a mouse in "paint" ...
Kelly: That is a great looking rad and hose options kit from Rywire ...
Steve: I remember your write-up on the Vee belly radiator and scoop but not sure if your air is entering at the wide end of Vee (I think yes because of hose connectors visible) ... I'm thinking of similar except under the cowling.  I don't have a metal under-belly for attachment nor the airspeed of your RV, so with the same setup your machine would have 1.5 - 1.7 times the cooling capacity.  Like WWII fighters with V12 liquid-cooled engines, it appears that efficient cooling relies on airspeed as much as anything else.
Jeff