I'm a tree climber by trade (27 years) andI'm in these trees all the time and trust me all redoaks don't drop every year. Some years they'll drop consecutively but not always. Weather has ALOT to do with acorn drop.
White oaks are usually every other year but once again not always. I've seen huge mature (150-200) year old white oaks go three years without dropping acorns. Like I said earlier acorn drop is tree specific, I can't stress this enough but it's true. Last year, here in Pa we had a kick ass year for all oaks. This year red oaks are loaded and not so good with the whites. Certain trees drop sooner than others depending on maturity.