Carb heat.

[Doug Davis]

This is not really a "coupe only" subject, but with the prospect of  cooler weather coming, perhaps an appropriate one.  Now I know that carb ice can form at just about any temp. considering the various atmospheric conditions involved, but it seems that the proper application of carb heat is a mystery to some,  depending on how a person was instructed.  So for the benefit of all, here are the questions: 1. should heat be checked randomly and often or only if the engine becomes rough ? 2. only during cooler weather ? 3. During approach, should one just pull to check on downwind or base, or heat be left on during the entire landing sequence? 4. Is the application of a little heat better or worse than none at all ? Now some of you may think the questions (at least some of them) are silly, and perhaps they are.  But you'd be surprised at the varied opinions you get when the subject comes up in "hangar talk". One example: Some think heat should be left on through the entire landing sequence, and frankly I think they are right.  The downside argument is that if you need to "go around" your power is reduced .  I had both experiences as a student many years ago.  I 've had an engine quit on final because I forgot to pull heat ( in late fall) and landing in the tree tops in north west Penna. is no fun.  And I've suffered loss of power while doing a touch 'n' go because I forgot to get rid  of the heat.  But----, I think I'd rather suffer a loss of full power, than a dead engine on final. So!------what think you,---list? Doug