It's an interesting name for a weight in one wingtip.

The "device" is a wingtip weight.

Anyone care to work up the comparison between a side mounted motor versus an ounce or so of wingtip weight? Just wondering, as we already have an existing set of test subjects to consider. There would be a fair number of models that already have those "devices" or at least a virtual equivalent. They should have been testing the effectiveness of the concept for quite awhile now.