The company hopes short-term investor pain will precede long-term gain.Archer Aviation (ACHR 0.15%) added some much-needed cash in August, but at the expense of existing shareholders. The news had a negative impact on the stock.Shares of Archer lost 18.5% in August, according to data provided by S&P Global Market Intelligence, as investors adjusted to a larger share count post-offering.Focused on the long trip aheadArcher is one of several companies working to commercialize electric vertical takeoff and lan ...