Function plane_change_dv 

pub fn plane_change_dv(v: KmPerSec, delta_i: Radians) -> KmPerSec

Compute the out-of-plane ΔV required for a simple plane change maneuver.

For a velocity v and plane change angle delta_i (radians), ΔV = 2 * v * sin(Δi / 2).