Originally Posted by Bubblehead
Anyone happen to know the distance from datum for the firewall for an RV-8? I am changing some things around and want to estimate the new cg. Thanks.
Datum is an imaginary line used for reference only. It can be anywhere you want it. I personally use the leading edge of the wing for the datum because it's very easy to measure anything from there.
Especially on taildragger RVs because in the level flight position, my main landing gear is pretty much exactly on the datum. Makes for VERY simple math. i.e. 0" times anything is 0.