Originally Posted by E-Challenged
A Cox .049 powered small Guillows model, without throttle control, will be hard to control. Getting through the maiden flight will be tricky requiring a lot of pilot skill, proper down and right thrust settings, proper cg and proper wing incidence. The .049 will probably have too much power and torque. Put prop on backwards to reduce power for maiden flight attempt.
Having successfully flown an .049 I whole heartedly agree with all of the above.
Putting the prop on backwards is a good idea, but I used to just set the motor rich to where it was breaking in and out of 2/4 cycle to reduce power.