Hi guys As I only download email every three days or so, I have to sit and sift through a lot of e mail to find the interesting stuff. I consistently find certain subjects rehashed over and over so I thought I would start a new one. I would like to start a thread on cooling systems or rather the theory of cooling systems.
I have been battling for months now to get a 3300 Jabiru to cool correctly in a Whisper motorglider. I have been through three different incarnations of cowl/cooler setups with little success. Either the cylinders cool sufficiently at the expense of the oil temps or vice versa. I have come to the conclusion that because of the low speeds obtained by the plane, it is no use looking at other GA aircraft for ideas for outlets. I think that in general motorgliders and low speed aircraft in general use more ram air cooling and just make their inlets big enough to allow enough air to pass through. The outlet is just a big hole at the bottom of the cowl. I have tried ducts that can be closed during gliding to minimize drag and shock cooling but with little to no success. Unfortunately I do not have any education in aerodynamics or fluid dynamics so I am going by real world experience and testing. Lets get a thread going here so we can all learn something. Regards Dene Collett Avlec Projects cc Port Elizabeth South Africa
