/// <summary>
/// Hash the engine.
/// </summary>
public override int GetHashCode()
{
int hash = part.GetHashCode();
if (engine != null)
{
hash ^= engine.GetHashCode();
}
if (engineFx != null)
{
hash ^= engineFx.GetHashCode();
}
if (gimbal != null)
{
hash ^= gimbal.GetHashCode();
}
return(hash);
}