Radio controlled model airplanes

Rookie 20 trainer model airplane was operated on the stabilizer and the rudder in pieces to align them with precision, also, it's body was cut vertically at centric line like a fish cooking manner to correct distortion from the beginning of  fabrication. Because, old type YS regulator was found in my junk box, applied I it there without hesitation. Crowded fuel tubes and pressure ones are the same scenery as Rookie 10 I tried before. Replacement of the power sources from OS 25 FSR to OS 32F would change the character of Rookie 20 that is dull trainer plane into nimble acrobatic one with the special YS fuel pressure system! I was surprised to check the position of CG, that was to the point of that drawn on the design paper, how come? I replaced the motors from a lighter 25 FSR to a heavier 32F motor?? The result obtained revealed that Rookie 20 has been flown in the condition of tail heavy pitching balance from the beginning burdening a lighter 25 FSR motor.
Remembering the past flying scenery, it was relatively difficult to make landing smooth, too much tendency to stall every time. I'm looking forward to try this newly improved Rookie 20 on coming Sunday.
As the next step, Sukhoi Su31-40 ARF by Mr. Naruke is waiting for me to be set it's internal moving mechanisms, servos, linkages including elevator differential action for left side more down direction that dependent on actual out side loop attitude. Anyway, it is always some difficult and requiring patience and concentration with time consuming work. The twisted and distorted main wings have been corrected fairly previously, so it is waiting for my own determination just to start. Thick engine nacelle might invite any vibration resonance, so reinforcement inside of firewall would be indispensable at all.