I have purchased and am flying a very nice 1970 SA-11. I received the original builders plan set (89 sheets, old and ragged but mostly legible) but not any of the operating info. Specifically the weight and balance data. It would save me a big chunk of time if I knew the moment arms and allowable CG range. I suppose I could go through the whole process of measuring, loading, and flight testing again, but hopefully that won't be necessary.

So far I have been flying solo with partial fuel and no baggage, but want to make sure I am not nearing any edges. Thanks!