IO540, couldn't agree with you more.
A CSU can make carb icing more insidious than usual with the very qualities of the unit, masking the problem. I still don't understand why any engines are still carb'd. You cannot even buy a new car without fuel injection anymore. This is a case when the CAA and other bodies hold up the development of a/c to a huge degree, by having such rediculous certification costs. Why do virtually no light a/c have silencers fitted, electronic ignition (Magnetos for god's sake!!!) etc.etc..I know it is said that what we have is tried and tested, so why are there still A/D's coming out on a/c and engines? IO540 I bet you know what I'm talking about!!