Hi there
Thanks to all for your replies. Firstly, to Gnarly Gnu, yes I have considered replacing the carb with fuel injection and I had an engineer point out to me the "bits" on the VW heads where these can be fitted. For most of the year however, carb ice isn't an issue (although it might be a tad chilly here from time to time, generally, Canterbury enjoys relatively low humidity). I do use carb heat over summer, but most of the time I apply it to confirm that it still works! Well, that's a slight exaggeration, because I always use carb heat in any sort of descent/power reduction, and of course on base and finals. At anytime of year.
And to Nev, on the day in question, there was around 2/10ths - cumulus as I recall. And it was a lot higher than the altitude I was flying at.
And to Ian R. Well, I proved that the carb heater works. Very well indeed as it happens. I would have ended up doing a forced landing if it hadn't have been working. I guess its just nice to know that it doesn't need to be mandatory and to be on permanently to go out there and safely commit aviation. There is the reduction in power when the carb heat is used, plus again, the increased fuel burn. I believe its better for the control to be used as needed.
Really appreciating the conversations. And hope its a damn sight warmer on your side of the Tasman than it is here right now. Still, the forecast for the morning here is fine and frosty, and the Corby just loves that thicker air. Take-off runs are shorter, the engine seems to produce more power, and although she's a draughty wee thing, and you need to be well bundled up, visibility will be unlimited, and all will be well with the world. Can't wait.
Safe flying to you all
Terry