Straight from the horses mouth [8D]
ORIGINAL: Muddiman
1) RC Maniac119 -The O.S. 32 is a hot engine for sure but I don't think it would have the low end torque to swing a 9x6 and accelerate the FM quickly out of it's stalled maneuvers. But I could be wrong.
2) CONDOR Hobbies per contract now has all rights to the Flying Machine.
3) The new FM ARF will be using two mini servos for the ailerons.
4) Using a tuned pipe can add up to 800-1500 RPM depending upon your setup. The muffled version works just as well. This a a major performance boost.
5) I have not found a source for the 4D Carburetor other than buying an old engine. Tower sells the .55 carb but it's a bit pricey. The other option I have not tried is using the Thunder Tiger .46 Pro engine or it's carb on the OS .46Ax.
Don