I've created a free Excel datasheet in order to permit to calculate the payload of any FSX aircraft. The new version 1.2 of ULM is uploaded on AVSIM: you can grab it because the tool is now translated into english (app and documentation).
Many features have been added since version 1.0.
I've put in the todo list the fact to add an Aircraft.ULM file for the Bird Dog
I'll let you know here when it's released.
Everything concerning Cessna O-1/L-19 Bird Dog is discussed here.
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