One of the big problems with "floggers" is that they are designed to make a lot of noise while inflicting minimal pain. The problem with long single-tailed whips is that unless the wielder is very skillful it is far too easy to inflict severe damage.

A usefull and extremely inexpensive alternative is the the "wire" whip. This is actually constructed out of "lamp cord" or "extension cord" available at virtually any large grocery or hardware store. This is dual conductor, multistranded copper wire, usually 16 to 18 awg (American Wire Gauge) covered in highly flexible plastic.

I would reccommend taking a six foot length and clipping off the two-pronged plug from the one end (and if it is an extension cord, the socket from the other end). Holding the cord in the middle, take a one foot loop and make an overhand knot in the bight. This will yield a handle and two ~30" tails. starting at the ends, split the two wires apart. You now have a four tailed whip.

You will find that with minimal practice you can raise marvelous wheals with minimal bruising. As with any thin implement of chastisement, care should be taken to avoid excess force which can result in cuts to the skin. However, experience has shown that this extension cord whip cuts less than switches of similar diameter.

Let me know how your efforts fare.