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-pkh- -> RE: Inrunner and outrunner motors? (4/16/2008 5:54:53 PM)
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quote:
ORIGINAL: whitecrest
Also, outrunners generally produce greater torque while spinning more slowly than inrunners. This allows for the use of larger props in applications requiring greater thrust and slower speeds. Inrunners are good for spinning smaller props at higher speeds in applications that require greater speed at the expense of thrust. You have assumed correctly.
Because of the torque difference mentioned above, outrunners are typically used to direct drive props, while inrunners are typically used with gearboxes to drive props. Although some inrunners are used to direct drive small props, especially in small, high speed planes.
Direct driving with an outrunner has the advantage of not having a gearbox that can generate noise and suffer mechanical failure. Using an inrunner with a gearbox has the advantage of flexibility, you can choose from a wider range of props, and adjust the gearbox ratio to keep your current draw within the limits of your motor/ESC/battery. With an outrunner, you have a more limited prop selection to keep under your max current limit.
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