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Eliaciam. Since all of the mentioned items are using up more space than a square inch, the center of those items is used for the calculation. The following data in inches. A. passengers 37.0 B. wing fuel tanks 25.0 C. header fuel tank 7.0 D. Instrument panel (I just installed a VSI) --> You would have to measure here from the firewall. Since all instruments are installed on it without much support if any, you need to use the virtual center of the panel. That is between the tank and the panel itself. But the distance of the panel to the firewall might be just fine for your calculations. I estimate it to be around 20 inches. Hartmut ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, December 05, 2005 6:49 PM Subject: [COUPERS-TECH] Weight and Balance Questions > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Please bear with my elementary weight and balance questions: > I have a 415 C. The center of gravity range for a 415C is 26.4" to 30.3" > > 1. The datum is the forward face of firewall - I understand that's the point > from where negative (to the front) and positive (to the rear) distances in > inches are measured. Correct? > > 2. Is the arm just the distance in inches from the datum to the position of > the item along the longitudinal axis of the plane?. > > 3. Does anybody have reliable documentation to get the arm for: > > A. passengers > B. wing fuel tanks > C. header fuel tank > D. Instrument panel (I just installed a VSI) > > Many thanks > > Eliacim Cortes > N87071 > > > > > > ============================================================================ == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
