# Moving weight around

Asked by: **Pilot**
**5489** views
Aerodynamics, General Aviation, Student Pilot

I am still new to this; thank you for taking time to consider a few more questions.

-Is it safe to assume that lighter planes (Cessna 172) are naturally heavier in the front because of where the engine/powerplant is located?

If this is the case, in order to move the CG aft, does the weight added to back of the plane **have to EXCEED** the weight in the front? I'm not talking about an aft CG that is out of limits; I'm just talking about having the CG move aft (even by a little bit).

For instance, If the plane has a full tank and only one pilot, the aircraft will probably have a more forward CG (still in limits...just more forward). Now, if a tiny bit of weight is added to the extreme back of the plane, will the CG still move aft? I'm guessing the front is still heavier...but SOME weight has been added to the back. Therefore, the CG should move back just a bit. Am I correct in my assumption?

I guess that's why it's called weight AND balance...HAH! Additional aft weight = CG moves aft. Additional forward weight = CG moves forward

-Can an aircraft be OVERWEIGHT but still IN CG LIMITS?

-In my practice problems, oil has a negative arm. Is this because it's FORWARD of the datum line?

I've always wondered why the formula is weight multiplied by arm and not weight added to arm. I guess if you have a weight of 25 pounds...those 25 pounds are exerted equally over the entire arm (thus multiplied).