We have both the DA150s and a ZDZ160 in giant scale unlimited race planes..So far the DAs are slightly faster, somewhere around 200 mph....I have a 3W 157 twin spark racing version here to test, if it's any faster than the DAs and 160 it will be raced, probably in Parker in October...
Here's the plane First one has a 280cc engine, second one a DA 150