Your Saito Fa180 will do the Rascal good. I run an 18 x 8 at about 7450 RPM which is on the minimum side for power . The extra 1000 RPM will do you good. Although the Rascal is not made to do hard aerobatics it's still a very good flyer. Easy take off and landing. Very smooth in flight. With it's big wing it doesn't like any high wind. I have had mine for about 7 years now and still enjoy flying it.