on the two links you provided to look at specs on this motor, one says 15 inch shaft length and the other says 20 inches. normally the 20 inch would be the long shaft version. where the inches begin to be measured and where they end, I don't know. probably from the bottom of the motor to the horizontal plate above the propeller, I would think. what is the length there? thanks
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I only do what the voices in my flyboxes tell me to do.