REFLECTOR: Aft cg limit

[John Dibble]

Al Gietzen wrote:

>
>
> To better understand the aft cg situation, I think it helps to
> consider the
>
> following.  The moment arms for the rear seats and the fuel tanks are
> both close to
>
> the aft cg limit.  Therefore when the plane is loaded near aft cg,
> fuel and weight in
>
> the rear seats have little affect on the cg location.
>
> I agree with this; but I would think that it does make a difference
> how much fuel is in the tanks since the CG of the fuel shifts as you
> pitch up, and the amount and effect of the shift varies with the
> amount that is in the tank. No?  I’d guess that with about half full
> tanks you can shift the CG by more than 0.5” by a change in pitch
> attitude.
>
> Al
>
> I agree that the fuel will shift and that is another reason for doing
> the stall test as the effect of the shift is not accounted for in the
> w&b calculation.  The shift effect is present for the stall test
> because one is pitching up to do the test.  I guess half full tanks
> would yeild the most aft cg situation.
>
> John
>
>
>
> The only thing that matters is the weight in the front seats. Of
> course weight in the nose matters, but I'm assuming that does not
> change.  So as long as you have sufficient weight in the front seats,
> you will be within the aft cg limit for your plane.  If you can stall
> the canard, then you are within the aft cg limit.  If you can stall
> the canard when flying solo with no other weight in the front, then
> you never have to do an aft cg calculation again, unless you lose
> weight or a lighter pilot solos in your plane.
>
> John
>
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