I think it can be completely arbitrary as long as it's properly documented.

> To: lml@lancaironline.net
> Date: Sun, 21 Dec 2008 17:47:30 -0500
> From: aadamson@highrf.com
> Subject: [LML] Legacy W&B
>
> So, some of you know that I created a nice excel template to be used to do
> the W&B for a Legacy. A question has come up that I can't answer from the
> information in the POH.
>
> Is has to do with the "reference - starting point".
>
> Which way did you do your W&B and which way is the *correct* way.
>
> a) Did you use the Firewall Joggle and the 64.625" ARM as the reference
> point, taking all your other measurements from that and then doing the
> adding and subtracting to get the actual ARM?
>
> b) Did you use the tip of the spinner as FS 0" and measure everything from
> that point?
>
> The manual suggests that you start with the 64.625 as the reference number
> and I suspect that is the correct way as that would be a closer reference to
> the actual MAC, than the tip of the spinner which can vary quite a bit.
> Take for example the MT prop/spinner it's a considerable different length
> than the Hartzell.
>
> So, which way is the correct way, and which did you use?
>
> Lastly, when doing the baggage area ARM, did you use the published 141" or
> did you actually measure when the ARM is for the center of the baggage area?
> Or did you just back calculate it?
>
> Thanks in advance, I'd like to include a note in my spreadsheet and I'd like
> this reference for my own W&B
>
> Alan Adamson
> Atlanta, GA
> Legacy FG - IO550 in carbon
>
>
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