Now this is helpful for those of us that have a hard time adding two plus two!!!
It equals five, by the way.... Thanks Colin!!! Scott --- Colin Rainey <brokerpilot9...@earthlink.net> wrote: > Just in case the formula is: > weight x arm or station location = moment > add all the weights first, then add all the moments > and divide by the total weight. That is your CG in > inches from your chosen point. > If negative numbers bother you use the tip of the > spinner or prop flange to have all positive. I used > the firewall so that I could change props, cowlings, > or even engines and it would not effect my first > numbers, merely require substituting the new numbers > from a re-weigh. Weigh the aircraft in the level > flight attitude so that your numbers reflect the > weight properly distributed as it would be in > flight. Make your self a weight and balance table of > 3 columns, weight, CG or arm, and moment. After > calculating current takeoff weight, set up a > separate column section below that for adjustments. > Record a couple of known stations or distances for > adding or deleting things (fuel, baggage, passenger, > aux fuel) and then use these locations for making > adjustments to keep the CG in the desired range, > preferably the first 2 inches of the CG range > published for the KR. Also calculate both takeoff > AND landing after fuel burn! It makes a difference > in ALL aircraft regardless of where your fuel is > located. Flying with the CG at or beyond the > forward limit will result in having to have speeds > higher than published by others, and may lead to > lack of elevator authority during a flare. Flying > with a CG aft or back beyond the rearward CG limit > will not only result in an aircraft that appears to > be unstable due to its being "busy" (like balancing > on the head of a pin) but can lead to an > unrecoverable stall, or even a flat spin from a > stall. > Make several copies of this chart, a picture hand > drawn helps even more with the visual understanding, > and keep one in the airplane, the rest with the > records of the plane. Practice different scenarios > and run the numbers. Don't rely on memory! > Calculate it each time you make a change to how you > load the plane. It is a requirement of the FAA regs > to calculate with each flight and a safe thing to > do. > > HAPPY FLYING! > > Colin Rainey > brokerpilot9...@earthlink.net > EarthLink Revolves Around You. > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to > krnet-le...@mylist.net > please see other KRnet info at > http://www.krnet.org/info.html > __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
