I guess I didn't read proof read the column carefully enough before it got printed....Bob Whitney's 1/2a scale model at the 2014 Nats was not flying with an 0.61 size engine....! I not sure a 1/2a scale model could even stay together with a .61 engine attached and it would go really fast.it should have said .061 engine! My fault on that error i wont hold it against youFred Cronenwett