Here in Tucson (about 2200 ft altitude I use 4.25 oz with 10 % nitro, 22% oil, and 5.5 oz with 15% nitro and 22%oil, to fly the pattern and about 8 laps on 63 ft lines center to handle) with a G. Nobler (40 oz). Dead reliable either way, with one flip starts nearly every time. Thunderbolt RC long plug and tongue muffler with 15 holes and no screws.
Randy Cuberly