RE: pull pull system on GP Sportster
Dave that plane should be a blast. I still have SS 90/120. I fly it once in a while. I have also owned the 60 the 40 and the bipe. The 60 was my favorite but the 120 is a close second. I use a pull/pull on my aerobatic stuff but never on a SS. The advantage from what I know is the even pull on both sides of the rudder. It's easier for a servo to pull the surface than push it. I used Sylivan solid steel golden rods in mine. I like the ease of use and strength of these rods. You could mount the servos in the tail to balance that big gasser.?.?.?
David