BERLIN, March 18 (Reuters) - German air taxi startup Volocopter plans to raise fresh funds from investors, its Chief Executive Florian Reuter said on Thursday, adding that a deal to go public via a special purpose acquisition company (SPAC) was one option. Volocopter just this month tapped investors led by U.S. asset manager Blackrock for 200 million euros ($239 million) in backing as it seeks certification for its battery-powered flying taxi. “We expect to need more money in the future,” Reuter said in an interview. “You can expect us to continue raising money going forward.” (Writing by Douglas Busvine Editing by Arno Schuetze)