I have used eCalc and came up with, I think, a nice combination of components for a single copter. The result in the attachment is for a single motor. If I want to make a quad copter and want to increase the flight time, I could multiple this combination by 4 but, is there a smarter way to achieve my goal.
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Chassis weight is your biggest enemy. Lighter is better, but not at the expense of strength. Also, you might want to buy the most efficient brushless motors which usually are very expensive as they use quality high strength magnets, oxygen free copper wire, are hand wound by experts (they used to wind military transformers to spec), balanced armatures, and quality low friction bearings. The end result is a motor that is highly efficient, but you would not want to pay for it as a hobbyist.
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Bernard,
Chassis weight is your biggest enemy. Lighter is better, but not at the expense of strength. Also, you might want to buy the most efficient brushless motors which usually are very expensive as they use quality high strength magnets, oxygen free copper wire, are hand wound by experts (they used to wind military transformers to spec), balanced armatures, and quality low friction bearings. The end result is a motor that is highly efficient, but you would not want to pay for it as a hobbyist.
Regards,
TCIII