pondlife,
Thankyou; that all makes a lot of sense. Your comment about partial carb heat making icing more likely rings a bell...I have heard it before, but had forgotten...really wish I had a memory.
I quite agree about leaving carb heat on right to the ground on final; maybe you could glide that last 200ft, but if the reason for putting in the carb heat is that you might need to go-around.... I'm sure you all get my point.
As to why I'm flying these strange machines with non-whirly wings - they're cheap, and I get to do what I want, not what my students need.
And it's an interesting change having to land and then slow down rather than the other way round.
Oh, and please, no comments from anyone saying as an instructor I should know about carb heat; in the R22 I do, but it has a carb temp gauge and you can use partial carb heat so it's all rather different. When it comes to f/w, I'm an ordinary PPL(A) who doesn't fly enough or know enough or get enough practice.