SkyDemon Forums

Weight & balance cessna 150 problem

http://forums.skydemon.aero/Topic8633.aspx

By Jerome - 3/12/2013 5:20:11 PM

Hi,
I am new here and still trying the trial version.
I am struggling with the weight and balance calculation in skydemon hope someone can help me.

I have the following w&b data for the cessna 150

Empty mass 1175 lbs - arm 32,5" --> moment 38,18
Pilot + Passenger 320 lbs - arm 39" --> moment 12,48
Fuel 9 usg = 54 lbs 54 lbs - arm 40" ---> moment 2,16
totals: 1549 lbs moment: 52,82

When I input these data in aircraft properties skydemon says 1548,9 lbs (this is correct) and moment arm is 34,10 not correct.

What am I doing wrong?

regards
By T67M - 4/4/2013 11:24:55 AM

Skydemon is trying to help you, but appears to have confused you slightly. 34.10 is the arm (in inches) not the moment (in inch-lbs). Moment divided by mass equals arm, 52820 / 1549 = 34.10. You may also be confusing commas for thousand separators with commas for decimal points.

Hope that helps,

T67M