First, what is the span or distance from motor shaft to motor shaft on the shipping ArduCopter?
Second, is it better for stability to reduce the span, or increase the span.
I understand that yaw control is better with less span,
Thoughts?
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Exact distances for official ArduCopters are 60cm Shaft-to-Shaft with longer 28cm arms and 46.5cm S-t-S with shorter 21.5cm arms.
Empty weight for 60cm ArduCopter without receiver or battery is 775gr. Receivers are usually 12-20gr each. Batteries (usable) starting from 150-180gr and up.