Fox Eagle IV .61
Ran my Fox Eagle IV .61 today for the first time. On 5% Omega with a MA 11X8 and a Fox Miracle plug it ran 12,750 rpm. I also ran my Tower .75 with the same fuel and prop and got 12,800 rpm. I have always read about the Fox Eagle as being a strong engine for it's class. The weight of these two engines with the stock mufflers is very close with the Tower being about .5 ounce heavier.
Bill