While all aircraft are designed within certain power and engine weight guidelines, Chris Heintz does not design his aircraft "around" a particular engine - to maximize the customer's choice of installed powerplant.  Recommended power is 65 to 100 horsepower, up to 185 lbs. installed weight.

That said, designer Heintz highly recommends the Rotax 912 series engines for the STOL CH 701:
"If you were to design an engine specifically for the 701,  you would probably end up with an engine much like the Rotax 912.  The 912 provides great reliability, and it's very efficient and smooth-running.  The power-to-weight ratio is good, and Rotax engines are supported worldwide, something that's important to customers around the world," Heintz stated. "While the initial purchase price is significant, the price actually compares very favorably with other engines when factoring in the low operating costs and long life of the engine - many owners are easily exceeding the published TBO."