Roberts13t

I believe the w/b on the original post is incorrect because procedures weren’t followed per the manual. Oil and fuel remain. Fuel number is questionable. Arm for oil is incorrect. Arm for front axle may or may not be correct. It looks like I’m going to get it redone. Also the numbers aren’t plugged into the cg formula given by Mooney. I may just put the weights and lengths I to the formula and draw my own conclusion.

Looking at these procedures it appears it was done incorrectly. All the oil and fuel should have been drained. Then instead of using the weight, arm, and moment they should have used the three weights and the formula given by Mooney. Looks like it will have to be redone correctly this time. I assume because it is a 64E then the Service manual from 1966 should be used opposed to the 106 series manual that also has E series in it but from 69-75? Personally I learned Empty weight was no fuel, but unusable in the tanks, and oil/hydraulic fluids to run it. Basically in a CH47 I needed to know how much fuel and how much internal or external cargo I needed to take in so it was good to already know the aircraft had oil/hydraulic fluid in it and accounted for. Truthfully if the mechanic did it that way then used the Mooney formula I probably wouldn't be that upset as it give a person a realistic functional "empty weight" and CG. Of course the question would arise of 6 of 8 qts of oil.

Thank you

I can’t get the service manual 106 to download. Has anyone else had trouble?

Have you weighed your E? Where was the front wheel compared to the datum? They didn’t do the computations correctly for subtracting the oil from the moment. If you subtract unusable fuel and moment then it changes CG by .12 forward.

Hank, these are the things that keep me up at night. I think the arm is incorrect too on the oil. The Mooney M20E w/b sheet I have says -6.5. (-7.5 is C models)

Using that figure from Mooney and the weights from the OP I get 46.11” for CG. That’s going in the direction I need it to.

So what should the net weight be? Did you get it by just adding up that column?

If weighed would there be a reason to see the previous? The previous is a calculated one, not a weighed one. The previous one can be traced through 7 previous computations of adding and subtracting equipment from the original w/b from factory. This current weighed one is 20 lbs heavier for empty weight, 1.64” CG toward the aft, and 3669.96 more moment. I’m wanting to focus on if this weighed one was done correctly because the changes seem large. Moreover the aft moving CG is of concern. And yes I know how it may have happened.

This is from a 64 M20E. It was weighed. This weighing moved the CG aft by over 1.5”. I don’t want to hear how it’s possible or anything other than trying to find errors in the process. Please just check the math and process on the computation sheet. I have a few ideas on some errors but I want to hear from the experts as I’m really new to mooneys. Thanks for the help!

Barn stormer has a C with gear down for 14k. It’s 2 hours from me in OK.