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<li style=”text-align: left;”>Craig,I have several Hangar #9 irons. Short answer: they are all slightly different. Most have a 10 to 20 degree temperature swing to activate the thermostat. When activated the thermostat connects the current increasing heat. Heat rises 10 to 20 degrees.
- Fairbanks
Do buy a thermal infrared thermometer and watch the iron cycle. If it is rising more than 20 degrees during the top heat cycle, the bimetallic thermostat control may be worn out and you need a new iron.
My preference is a temperature cycle between 200 and 220 degrees C. I sometimes need to make tiny adjustments in the thermostat knob to achieve the desired top temperature. It is common for model aircraft irons to have a top temperature just under 200 degrees, necessitating an adjustment. See how below.
Bruce Campbell