Hello Jeff,
FWIW, when I did the W&B on my Mono Classic I calculated the moment arms for
both the forward and rear sections of the extended baggage bay.
For the calculations, I used a 20.5 kg bag of wild bird seed as I considered
this to be a good way to spread the load.
In the forward section the bag was stood vertically. Calculated arm was 84.3
3=9D
In the rear section, the bag was placed flat across the aircraft and pushed a
s far back as possible. Calculated arm was 96.26=9D
Best regards
Kingsley in Oz
Sent from my iPhone
> On 5 Apr 2021, at 1:44 am, Jeffrey Williams <jeffwill55@sbcglobal.net> wro
te:
>
> =EF=BBI am working on an initial weight and balance for my Europa XS an
d I was wondering how the baggage arm listed in the Europa manual came about
.
>
> Does anyone know, and is it worth thinking about?
>
> Page 6-4 of The "XS Trigear Owners Manual=9D, Issue 7, January 2015,
shows the arm for baggage at 88. The weight and balance arm measurements ar
e taken starting at the rear of the joggle for the cowling, which is at Fuse
lage Station FS 29.25.
>
> As I measure it, the bottom of the D-panel bulkhead at the back of the bag
gage area is at 94.5=9D aft of the joggle, which is FS 103.75. A typic
al carry-on bag is 23 inches tall, and I expect the CG for that in the aircr
aft would be about at the mid-point, or 11.5 inches forward of the base of t
he D panel bulkhead.
>
> The result of 103.75 - 11.50 is an arm of 92.25, not 88.
>
> Six and a half (6.5) inches in the baggage arm does make a difference with
full bags loaded onboard. And CG calculations do need to be based on what I
are putting on board and where those things are actually located.
>
> However, I expect using 88 is close enough - unless it looks like I am get
ting close to the limits, which I would think should be seldom, if ever.
>
> Right?
>
> Regards,
>
> Jeff Williams
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