If you are missing W&B information that you need to set up an Aircraft W&B profile, you can get some of that information from the FAA. The Type Certificate Data Sheet (TCDS) will provide information such as:
- CG Envelope Range
- Maximum weight
- Maximum Baggage weight and arm
- Fuel Capacity and arm
- Oil Capacity and arm
FAA TCDS search page
Once on the FAA TCDS page, you can search for your aircraft TCDS on the left side. When you find your Make and Model, click on that link. The next page will have a hyperlinked TCDS # that you will want to click on.
FAA Model TCDS information page for a specific aircraft
The next page will have a PDF link that will take you to the in-depth TCDS information.
FAA TCDS information page for a specific aircraft
Browse the PDF document for your specific aircraft. Once you find it, be sure to verify it covers your serial number. The TCDS should provide some useful CG information.
Detailed TCDS for an aircraft
This is just a starting point. It is incumbent on you to be sure the information you are using is accurate for your aircraft in its current state - with or without modifications.