Good day all I thoiught I would just report that I have sorted out the cooling issues on the Jabiru powered whisper motorglider. I have learnt that the inlets are indeed big enough to let in enough air at the low speeds of the motorglider. The problem was with the outlet. I have learned that the centre of the cowl underside is not the ideal position for an outlet. Also the theory of 30% more outlet area as inlet is only valid at certain airspeeds.
As for the inlet for the oil cooler, we learned that the most efficient inlet is a slit in the underside of the cowl with a lip/scoop taking in air into a divergent duct. You would be amazzed at how small an inlet is necessary. Thanks to all that gave advice on the subject. Regards Dene Collett Avlec Projects cc Port Elizabeth South Africa
