[RCSE] A web site to explain the different F3's ?

[Miles]

I am familiar with the F3x letters, but I don't know what they mean.  I am
sure they refer to different types of soaring.  Is there a web site that
will explain what F3B, F3F, F3J, and AMA TD are?  I didn't find it on f3x.

Thanks
Miles

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