Happy to clarify how we calculate our surface area % increase.
With all of our calculations we're specifically looking at the area of the landing foot which contacts the ground.
Attached is a picture of a cross section of a Power Gear landing foot.
As you can see there is a significant lip and bowl where it's bolted to the cylinder. So we started by calculating the inside and outside diameter of the section which contacts the ground.
Foot surface area:
OD = 57.47 sq/in
ID = 23.22 sq/in
Total area that contacts the ground = 34.25 sq/in
Then we calculated the surface area of the SnapPad Prime pad which contacts the ground (minus the 2" bolt access hole in the middle)
Prime surface area:
Octagon with a diameter of 13.25in (flat side to flat side) - bolt hole access = 142.3 sq/in
Surface area increase: 142.3 - 34.25 =108.05 sq/in
Then we compare that to the original surface area that contacts the ground
108.05 / 34.25 = 3.1547 x 100 = 315.5%
Hope that helps. If interested you can view the rest SnapPad surface area increases here.
Feel free to reach out if you have any other questions