The RCV CD engine range is the ideal choice for scale, aerobatic , fun and general flying. The engine uses RCV's unique rotary cylinder valve system - which has only one extra moving component to a 2-stroke and so is very easy to maintain. Its ultra low profile means the hight of this engine is approximately 18mm less (compared to OS & Magnum) & the highest  point is 14mm further back which makes cowling much easier than other engines. So if you are looking for a reliable, easy to use 4-stroke engine that is the same height as a 2-stroke engine, the RCV CD engine is a perfect option.

 RCV Timing

58CD Manual