You do not need a lot of weight up front. I have had two Gee Bee and they balanced out perfect with the OS 120surpass. The first one I put the radial engine cover and it made it very noise heavy so I had to move electronics back,and add about 3/4 of a oz to the tail. I will say go with anything around 33- 34 oz (2.08 lbs) and you will be good( this is without the radial engine cover).