You've got to be a little bit careful applying SCA to light piston aircraft because of the size of the correcting angles you end up with. It's all very well to use an SCA of 10° when you're whizzing along at 360 kts in your Hawk but, in a PA28 doing 100 kts, a head/tail wind can change the SCA from 30° to 60°. In addition, in both these cases you're operating outside small angle theory on which the whole thing is based. It can be useful but you've got to understand its limitations.