Quote:
Originally Posted by V-Rossi
Stubby packs are (often) higher than conventional size packs, and thus result in a higher CoG. The idea of using the shorter packs is not to add extra weight under them, and ending up with an all-round lighter car.
|
I'm not suggesting putting the ballast under the Lipo, that would raise the CoG. If the ballast and Lipo are both flat on the chassis the CoG calculations are:
Stubby Lipo (200g and 25mm high) = 200g x 12.5mm = 2500gmm
Lead ballast (100g, 3mm high) = 100g * 1.5mm = 150gmm
CoG position = ( 2500 + 150 ) / 300g =
8.8mm
If a standard Lipo is 300g and 23mm high, its CoG is
11.5mm (half its height).
So the (stubby with ballast) has a
2.7mm lower CoG than the (big lipo without ballast). The trick is finding somewhere to put the ballast, but because the pack is so small there's plenty of spare space on the chassis.
And you also have the option of not running the ballast and having a nice light car for smooth indoor tracks. Win win
.