Odds on Flopping Open-End Draw on Flop

[imashyboi]

Hi, I just have a question which I can't calculate. Anyone knows the odds of flopping an open-ended straight draw on the flop when holding connectors? (AK, KQ, QJ, JT, T9, 87, etc...)

How about flopping an open-ended straight draw with flush draw when holding suited connectors?

I know the odds of flopping a four flush on the flop is about 6.5-1. Let me know some insight on this, I'm sure some players would like to know as well. Thanks