A friend built the Marutaka DC3, also sold as Royal. His had two Enya 30 2 stroke engines in it which made it take off like a rocket but it crashed on it's first flight suffering a small amount of damage.

It reappeared repaired & in civilian markings many years later & the local pattern ace test flew it. This time it almost crashed only saved by the pilot's extraordinary skill.

Further research showed the balance point was incorrectly marked on the kit plans. With the balance point fixed it was a fine flyer from that point on. - John.