I was one day looking for information about Rutan's Grizzly, a three surface STOL bush plane which doesn't look at all like the Piper Cub. Today, I found a related patent, how Burt Rutan managed to implement fowler flaps without external supports which create drag on cruise.
You can read it here: http://www.freepatentsonline.com/4614320.html?query=PN%2F4614320+OR+4614320&stemming=on
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