What is the general trend of payload vs total weight for a radio controlled propeller aircraft? I am simply using this formula:

$$Wo = \frac{Wpayload}{(1-((We/Wo)+(Wp/Wo)))}$$

I could get We/Wo (structural weight fraction) and Wp/Wo (powerplant weight fraction) from historical data, but they do not say about how much payload it can carry. So I took 10% of structural weight as payload fraction, for now, to avoid "NaN problem" as the sum of fractions will become 1 and Wo equation will be 1/0.


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