Russ Strine on B-25 Carburetor Heat

Since Russ can not easily get on line, I have offered to post his answers to questions posted in the forum. He has faxed me six pages of handwritten notes and here is the first subject:********************************************************CARBURETOR ICEThe B-25 models were originally equipped with a Holley carburetor. The Holley carburetor was fairly susceptible to carburetor icing and carburetor heat was used as a routine practice, checking carburetor operation prior to take off and then using heat in flight as required, and again prior to landing to clear out any ice. Proper carburetor management in flight would be done by maintaining the carb air temp either below or above the icing range which is from 0 degrees C to plus 10 degrees C. Below these temps it is generally too cold to form ice and above, it is too warm.Very near the end of B-25 production, the Bendix pressure carburetor was utilized instead of the Holley. (Ed. note: BT has Bendix carbs) Due to design, the Bendix carburetor is not as susceptible to icing as the Holley was, and the use of carburetor heat is not necessary as a standard procedure. Therefore it is only necessary to check that the controls work during run-up procedures and that the doors inside the air-scoops are open and the controls are in the corresponding positions.Russ StrinePresidentMid Atlantic Air Museum************************************************I will post this to the appropriate thread, as well, for those who have subscribed to it. More to follow...Bill Rambow MAAM-SIM - Rambow, Visser, Banting, and Younghttp://www.fssupport.com/maam_sim/maamsim_logo.gif