Hey i sent you pm, did not see your post before now! But your concern about the all up weight of the tojeiro 90 is a worry i understand ,it is to heavy . mine with fut 3050digi ,asp91 with bolly eq60 pipe,fut 149dp receiver,2s 1700mha lipo with 4,8v regulator , the all up weight is 4,1kg . this is more than the pattern planes from the early 1990 ,and the span is smaller .....

But it handles well in the air ,and is more than good enough fore pattern practice . ps your os91 is perfect sized engine fore the tojeiro 90.