They probably perform as the manufacturer stated.

RTP has been around for a while. Guillows 500 series [link]http://www.guillow.com/Series500BalsaKits.aspx[/link] are designed to fly RTP with a Cox .020 (0.33 ci) Pee Wee reed valve engine (or electric motor equivalent) and a single line to a pole.

The Sterling "M" kit series of planes with a nominal wingspan of 20 to 24 inches (508 - 610 mm) were designed to use the Cox Pee Wee .020 engine, were built like free flight stick and tissue, could be flown CL, FF and RTP. For RTP, they used a larger vertically oriented CL bellcrank with spacing of a CL handle with a bracket that was pinned (nail) to a pole driven into the ground standing several feet above the ground. CL lines from the plane were connected to the pole bellcrank. Once flying, the pole bellcrank would turn with the model. If model climbed, the vertically stationary pole bellcrank would cause a little down elevator to be applied. If it sunk, a little up elevator would be applied. Basically it was self regulating, especially in the presence of light wind.

Another setup that was available in the early 1960's was a remote CL lever outside the CL circle with linkage to an articulated CL pole bellcrank, which in turn the CL lines from the plane were connected to. It would allow one to fly the CL plane while outside the circle.