I have just completed building a SIG Kadet Mark 2 (from a kit) and I have it powered with a Magnum 40. I have modified the planes landing gear to a tail dragger. My problem is this..... when I taxi, the plane tracks straight. As soon as the tail wheel lifts off, the plane will pull to the left, and just spin in circles! If I give it some up elevator (to keep the tail wheel down longer), the plane will pull up very quickly then as it starts to climb, it will again pull to the left, and usually ends up doing a beautiful arch, and hit the dirt! On the few occaisons when I have been able to wrestle it up into the air, I have been able to trim it for level straight flight. It will not pull to the left in flight, even when going from idle to full throttle. The planes flies great, but is a little sluggish on the ailerons.
Everything looks straight, CG is right, and I'm running out of ideas.
I have tried to do a slower takeoff (at 1/2 to 2/3 throttle) but as soon as it picks a speed ...... here we go in circles!
Before I decide to strip the plane, and make it a static model, Any Ideas or suggestions?