Many, many ultralights don't have a really defined "airfoil", rather they have a consistent cross-section on the wing that's defined by stretched fabric over aluminum tube or even (in the oldest examples) wooden-stick "battens." As such, the construction method also has a lot to do with the final shape - a lot of the early-type ultralight construction methods, for example, aren't capable of holding a prescribed shape, just a consistent one somewhere in that neighborhood.Īirfoils are chosen to suit a particular set of mission needs, for a particular wing that's already been designed. The Harry Riblett GA30- series would be very good, with the rest of the digits filled in depending on the exact mission of your ultralight. Most of the older (Clark 'Y') and such airfoils would be fine.
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