The following was found at:
Otto Frohlich from Germany sent in these two photos. Since Otto n I can
only communicate thru a computer translation program, naturally our
exchange of words is somewhat limited. This being the case, I am
commenting on what I can surmise from the photos.
added a carburetor heat system to his CH-7 Angel. Above you can see how
his system recovers heat/warm air from the 582's exhaust system. Below you
see how it is added to the air cleaner.
is not obvious in the photos is if the heated air is permanently
added or if there is some way to stop the heated and un filtered
flow from entering the air filter?
Also it looks like Otto has a temperature or perhaps a humidity probe
mounted in the air cleaner. I would suspect it is a temp probe.....
I was stationed in Germany during my days in the US Army (Fligerhorst near
Frankfurt AM, 1970/71) I can remember many cold and damp days when carb
heat would be a must.
A simple way of redirecting the air would be to install a "dryer
duct control. These are used in cloths dryers for directly air outside or
The unit used to capture the air is available from most ultralight
aircraft supply depots. The Leaf catalogue lists one used for heating the
cabin (which I do NOT recommend) but for carb heat as shown above should
work - as long as you can open and close the valve when needed.