around 45 - 50 max on slow fly by ... less than that may actually give you more lift, but i like the braking drag flaps give you .. depends on the model. this requires doing the slow low pass with more throttle ... this is good as when you need to pull out, there is not as much worry as if when spooling from a lower RPM ... basically, "drag" the jet through the low slow pass ... don't dump the flaps till pulled well out, as pulling flaps back up at too low of a speed can cause either stall, loss of needed lift, or altitude ..

Also, be aware of the ground effect cushion . You can slow way down when really low, and you are flying on a ground effect cushion ... does not mean you can pull out of this without gaining a lot more speed however .


Voy