Assuming you have the original type Wot4 with parallel chord wings ( not the new tapered wings ) the info from the original instructions is

C of G 3.5 inches back from leading edge plus or minus .25 inch (repeat three and half inches plus or minus one quarter inch )
Set up control movements as specified below using the lower limits initially
Aileron one quarter to three eighths inch up and down at TE

Elevator three eighths to five eighths inch up and down at widest point

Rudder one and three quarters ( 1.75 ) inch left and right at widest point

For the benefit of those who have not heard of the Wot4 its just about the best flying plane you can have. Its ideal for practising aerobatics as you can get away with errors better than a pattern model and it does just about anything. In a stiff breeze it will hover upright or inverted - great fun! Also it can be used on a wide range of engines so you can use it as an engine test model. It is a classic plane

Note the instructions say an optional three quarters inch dihedral under each tip for trainer only. Mine was built with a flat wing for aerobatic flying. I don’t think it would hover inverted with dihedral! Check this point on a secondhand model and only use a large engine if the tailplane has the spruce reinforcement.
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Mine lasted for 554 flights before succumbing to oil soaked balsa syndrome. A great model.


Kits are still available from Chris Foss Designs [link=http://www.chrisfoss.co.uk]www.chrisfoss.co.uk[/link]