Does anyone know if the manual is correct. They list the CG as 7.5-8cm from the leading edge. Should it be inches instead of centimeters? That just does not sound like thats back far enough. Its the Seagull version.

I would think it is which ever is close to the main spar

This is a constant cord wing. Measure the width of the wing. Take this measurement and multiple it by .25. The resulting number will give you a CG measured at 25%.