I need to give credit where credit is due. Martin is right and I am somewhat off the mark. Landing flaps do in fact give you a lower stall speed, up to a point. Once you get past a certain deflection; however, you stop adding lift and start adding drag. There is a point where lift is maximized at minimum drag expense, that would be a good setting, assuming you have enough thrust on tap to push yourself along in level flight!

I should have elaborated a bit about "takeoff flaps." Full size airplanes and especially jet airliners often have different takeoff flap settings. A lower deflection setting, say 5 degrees, which give a better climb rate due to a higher climb speed; and a higher flap setting, say 15 degrees, which allows a steeper angle of climb and allows for rotation at a lower airspeed because of the lower stall speed, hence a shorter takeoff roll. So I would go with the higher takeoff flap setting if I wanted to do a slow flyby.

There is definitely an amount of deflection you do not want to exceed. Short of that point, you will just have to play test pilot to find the best setting.

Now, if you are flying a Hotspot......

Don't worry gents, I know when to quit!