Yes Greebo is actually right. I use to fly the ki61 way back in the days and i still pull it out sometimes now and then. It will fight good while the speed is between 220-200 or so and then you will have to change the fight to a vertical spiral if you will be fighting the f6f. Yet the f6f will pull nose up and hang with you due to its big props, so you will have to push the f6f to miss his shots and then come back down and finish him off quick before he reverses on you. Thats just fighting A good f6f stick in my opinion. If he is heavy coming off a CV trying to bomb the shore battery or town then you can finish him off quicky with the long range guns the ki61 has. Let me just put it all in simple words, it all comes down to who if flying the planes.
