I ran up a few .25 sized motors just to see. I used an 8-6 Master Airscrew prop and 10% on all test with no muffler. The LA .25 was 15,500 with the control line carb, a different one with the rc carb was 16,300, an AX .25 was 17,400, an old OS .20 was 15,000. and a Magnum .28 was 17,400. A Norvel .25 was 16,200 but I think there was a muffler on that one. I am just sort of interested in how the Novarossi compares, as I am thinking of getting a .28 rear exh. at some point.