Hi,
‌
I‌ am trying to get the Cessna 152 W&B from the flight manual into Skydemon.
F‌irst I don't get it why Skydemon only offers a weight vs lever arm model, while a lot of W&B flight manuals have a weight vs ‌moment model. But ok, lets just divide the weight out of all the flight manual drawings and hope for the best....

U‌nfortunately ‌once I was finished, the Skydemon calculations did not match my manual calculations according to the Cessna flight manual. For debugging purposes, I set all all the weights and fuel to zero. So I was expecting to find the empty weight in the W&B chart. 
B‌ut as it can be seen, the W&B charts shows 539,8 kg as takeoff weight, while the empty weight is actually set to 545,5 kg.

A‌m I doing something wrong / am I not getting something here? Or is Skydemon not able to calculate W&B properly?

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The lever arm figures that you are using look odd.  The datum on the 152 is the firewall.  Thus the fuel, baggage 1 and baggage 2 lever arms should all be greater than the Pilot seat lever arm as they are all behind that location.  The lever arm figures that I am familiar with are
‌Pilot 0.99m
‌Fuel 1.07 m
L‌uggage 1  1.63m
Luggage 2  2.13m

‌‌‌

George E A Reid

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