Part 3 · Rudiments · Chapter 33
A flam tap is a flam followed by a tap with the same hand as the main note: lR R, rL L. It sounds like a galloping double stroke.
Bass drum on every beat under the flam taps.
The main note is high, the tap is low, and the low tap stick then plays the grace note of the next flam. Keep those two heights clear and flam taps become easy.