HI THERE SEENMCRASH! If you can get enough tork out of the rudder, that is the key ingredient to great spins. A scale type model might not have a large enough rudder to do the job, take a look at 3D planes to get an idea of proportion. A rearward CG is important also. Setting your ailerons up as FLAPERONS, coupled out of phase with the elevator will help keep the nose up. If you have enough power, and if your model is light enough, climbing flat spins are possible[X(]!