Used this to replace stock fan unit for the 50mm EDF planes (F-16, F-18, F-36, etc...). The fan housing's "lip" is in the rear like the stock fan so no foam cutting necessary. Stock motor (4300kv) will work with this fan. Will need to drill slightly larger hole for fan. Will need to cut back cylinder into which motor fits in order to get front plate of motor to fit into housing. 15 minutes total of easy mods in my opinion. Will get more
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