Maidened the Simla today, 96" span with Super Tigre 60 ABC Blue Head. Engine turned 12,000 rpm static with APC 11x6 prop, 11,000 rpm with APC 11x7. Fuel is my own "60" blend (10% nitro, 16% lube, 11% of which is castor). Initial flight a bit too rich and she needed a lot of down trim, but that was easily sorted out. Flies really well with 11x6; 11x7 a bit too much load on the motor - will likely try 11x5 or 11.5x4 next.

Club mate helped measure roll rate - one full roll took 2.3 seconds at low rates, and 1.2 seconds at high rates, this with the 11x7 prop fitted.