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I have a question about... Wait for it... MOIs!!!!

P

Peregrine

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unitedstates
:eek:

So I've read that Roskam's Method can be used to estimate MOIs for my plane. Not a problem, I've used three different planes in Roskam's list for each of my plane's axes.

However.... here's the dupe....................

Roskam's Method includes 3 formulas that make use of the maximum takeoff weight, and 3 constants from Roskam's table which assume the aircraft are fully fueled.

The Weight and Balance table in FSEdit uses empty weight, though. Does this mean Roskam's Method can or can't be relied upon, since fuel in the wings contributes considerably to roll MOI?

PLEASE HELP!

:cool:

Later...
 
Last edited:
Hi,

That is a very good question. It is some time ago I used the Roskam books (when I was still studying actually), so I can't remember exactly how the equations were formed. But you are right that including the fuel can have a big influence on the moments of inertia.

But, given the fact that the fuel tanks are probably not that complex in shape (box like shapes), I think it should be possible to estimate their influence on the MOI and thereby get a good guess for the MOI of the aircraft without fuel.
 
Hey Arno,

Thanks for the reply. I'll look into the shape and size of the fuel tanks. Knowing that info should allow me to better estimate empty MOIs. :teacher:

Later Arno!

:wave:
 
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