Really helpful, My instructor went through this like a Bugatti Veyron 16.4 Super Sport; 267 mph, 0-60 in 2.2 seconds... i did not get it at all .... Thanks Man god Bless .
I agree, the lesson would be more understandable if it started with a general description. Here is the scoop. ARM: the length between a datum point and the weight (such as gas in a tank or a passenger). Datum point: An arbitrary point selected by the A/C manufacturer. It is commonly the firewall for light aircraft. You don't need to know where it is because the POH delineates the ARM length for each weight in the A/C. Moment: The ARM x the Weight. The units for Moment is inch-pounds.
thank you so much for the wonderfull video, am a ground operator at Frankfurt Airport Germany, it helps me so much understanding the weight and balance
Thank you so much for all this info. I followed along and got the hang of it before the end of the chart. Ill be taking my Oral and practical tests for the A/P license Monday and weight and balance was something I was worried about but feeling better now.
just so I'm understanding this correctly... the only purpose for the moment is to solve for the missing arm? or does the moment serve another purpose? thanks for the video!
Great vid. Now I am asked what is my take off CG aft of datum in inches and landing CG.????? How do I get those two. Hmmmm :/ why is learning to fly so darn difficult.
hi I was wondering how did you get 48.1 c.g for usable fuel when the PHO states clearly 40.0. I just don't get it. can you clarify? Thanks. I'm strongly considering taking your on line course. thanks
Only complaint I have in this lesson is that you say"minus the negative number from the number but it actually is adding because if you minus -48 - 120 = -168 but if you add -48 + 120 = 72. it was confusing so I put it in excel so I could figure it out. I think the correct statement should be -48 + 120 = 72 (numbers were changed for example only)
Great video, every pilot (private or commercial) should be able to make a quick weight and balance form like this by hand. Yes, there are many tools, apps and online websites available today that will just do it all for you but a good pilot does not only rely on technology because that can always fail in some way. Let's say the day you want to fly with some friends your ipad with your 'apps' suddenly falls to the ground and is broken, or the wifi is down, or the app is down? You gonna look pretty stupid then if you have to ask someone else for help because you don't know how to make a weight & balance! Apps and stuff are a great tool but remember that they are just A TOOL (to help you), don't put ALL your trust in them and ignore everything else.. :-)
Oops! The A/C empty weight, arm and moment DOES NOT come out of the POH. The POH does not have information about what equipment (radios, aux. tanks, etc.) are specific to a particular A/C. The empty A/C data is printed on the AC37 form that is, by regulation, carried in the A/C. Anytime on board equipment is installed/removed a mechanic must change the AC37 form so you (the pilot) knows the data for the specific A/C you are flying
You are incorrect. A moment is basically leverage. Like a teeter- totter. You want the T-T level (with-in aircraft limits). Front weight is pretty much set by fuel, engine weight etc. If you rear-load the aircraft too much it will drop the tail and push the nose up too much causing a stall. The farther the weight is back the worse this gets. That is the Moment-Arm and has nothing to do with inertia (momentum).
More precisely, oil is part of Basic Empty Weight, but not part of the older standard of Licensed Empty Weight. The difference comes from engine design; radial engines, and older engines in general, tend to burn a LOT more oil, so it was treated as a consumable like fuel. More modern engines don't burn much oil, and can thus treat it's weight as a constant.
