I have a Sukhoi 30 with a O.S. 120 FS on it . I have lost the manual that came with it and I am trying to figure out where the balance points are. Can anybody help with this ?
Or have another method where I can set the balance so I can fly it safely and then adjust the balance from there. What would be a safe starting point?

I've never seen a plane that wouldn't fly safely when balanced on the wing tube.

Thank you for the response.

The wing tube is not visible as the wing is completely covered in one piece . So it not possible to use it a starting point.

Also a well respected pattern flyer at our field ( Black Dirt ) said that there are many planes that do not balance on the spar, thus before or behind it. He also said that this was especially common, but not universal, in acrobatic planes with tapered wings. Which this clearly is .