How to get the Optimum CG in an Airplane, and why is Important! 

Can't find that tail ballast kit...?

You will need to be out of aft CG to be affected that much that leads to a tendency to ground loop. Rudder authority is not affected at all

@scottbeyer. Moving the CG aft does increase the tendency yes. Add more you do add more it’s getting unstable. As you increase the distance between the mains and the CG the stability decreases. The problem of any unstable equilibrium situation. The law of the physics is not change at the aerodynamic CG envelop as you are on ground the only thing that counts is the distance between the contact point of the mains and the CG. As this increases the tendency, or the instability of the equilibrium increases. For the rudder authority this is a still a aerodynamic factor and this authority is defined by the Surface size the deflection angel and the mass of air and it’s speed passing the deflection on the rudder. So the rudder authority is not directly affected by the added weight. As you my change your speed with this technique you may need to consider the effect on your ability. But with less speed there is also less kinetic energy so less tendency to ground loop instead of being faster. But still your CG is more aft so to balance your unstable equilibrium will be more difficult.

@backcountry182 love you Videos great job. Did allow myself the comment because I had the feeling that your respond could lead to a miss conclusion about the effects as I see it. Willing to discuss beside if you wish. Keep up the great videos coming😊

There is a range of acceptable cg. These guys probably are at the forward range with 1 or 2 people on board. But they had better check that when they put passengers in the back and bags that they don’t go outside the range because spin recovery is just one of the things affected. Based on what they are saying, they don’t have a solid handle on the technical aspects of what they are doing.

Just need an approval from your mechanic

@@motoadveBackcountry182 I am pretty sure it is a structural modification. My mechanics are leery of the idea. How did you anchor your's? Did you use lead?

@@ericmuetterties1984 Diver lead weights, glued, velcroed , and tie rap, even survived a crash and never moved or damaged anything,

I don’t think ya need any govt approval for a bag a sand in yer cargo hold:)

@@aero3085 Actually you do. And the weight needs to be fastened to a bulkhead and marked "Do Not Remove" and painted red. It needs to be signed off by an A&P. Page 68 of "Weight & Balance Handbook (FAA-H-8083-1B)"