ORIGINAL: da Rock

If noone answers with the numbers from the CMPro manual, there is a simple and very reliable alternative. Take a yardstick and about 5 minutes of your time and measure the model you have sitting before you. Plug the numbers into this application http://www.geistware.com/rcmodeling/cg_super_calc.htm give it 20% for the Static Margin and click the button. Record the CG location. Then change the 20% to a 5% and click again. Record that second CG and you've got a safe, reliable, usable range for the CG that will work for your model.