Originally Posted by
JammedStab
I rent a Grumman Cheetah in Dallas. Recently I flew one of their models that I had not flown before. It had been several months since my last flight and I only have a few flights total.
During the carb heat check on the run up there was barely any needle movement. I ended up calling the instructor who checked me out and he assured me that it is normal. The owner of the school who seems to be very knowledgeable later said the same. He said that the heater unit around the exhaust pipe is smaller than the Cessna's I am used to.
I have meant to ask about this on a Grumman forum but haven't done so yet. No problems encountered on that flight.
I call BS. My Grumman AA1 has a 200 + RPM drop with carb heat selected on and the Traveler I used to fly was the same.