Sherwood40
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- Dec 23, 2010
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I am working on a slow build (from plans) of a design that seems to have some "older looking" features. As such, I am considering going with a non-pressure cowling, like the Cubs that have the cylinders out in the breeze with the scoops over the cylinders. I'm fairly sure aviation went away from this because pressure cowlings (cylinders on the inside) are better for cooling, and also perhaps weather resistance (if stored outside). The engine my design calls for is a Jabiru 2200, which I know is used in non-pressure cowled applications - mostly pushers, but there are also some un-cowled tractor designs. I'm not looking for "no, don't do it, ever, if a pressure-type cowling is available" kind of answers, but rather, someone with experience with 1920's - 1930's designs where the "cylinders in the breeze" type cowling was common could comment as to things to look out for with this concept. Cruise speed I'm expecting to be in the 80-85 mph range. Also - anyone know of a Jabiru-powered design that already might have this type of cowling? I asked this on a Jabiru-specific forum and they misunderstood the question (pointed me to high-wing pushers with no cowlings). Thanks.
