tnestell wrote:Peter Person wrote:Thanks for all the input.
I don't think it was icing as temps were in the 28-36 degree range.
Carb icing can occur at temps higher than 36 degrees. Incoming air is compressed going through the venturi producing heat and then expanding causing it to cool, along with gas vaporizing causing more chilling. So on a humid day, temp about 35, moisture in the air condenses and can cause frost and blocking incoming air.
Many years back I flew small private planes, Cessena’s. Back then when the had carburetors icing was a year round concern and it was a routine in takeoffs and landings to pull the “Carb heat” lever. Icing can occur with some summer temps and high humidity. You might not see humidity in the winter like the summer has but moisture in the fuel especially if your running pump gas with ethanol which has a way of pulling water into the fuel.
Check this out.