I have the 90t in a 40 size H9 Cub, and in the Top Flite Gold Edition Cessna 182. The Cub is much more spirited, while the Cessna flies more scale-like. The Cub specs say 6.5-7.5lbs, while the 182 reads 11.5-12.5lbs, so I would say that the 90t should have no problem with 8-9lbs.