Good day sir. As an old flyer myself I have switched to all electric power. I am not familiar with the pulse 15 or 40 you mentioned but there are many 40 size models to choose from. As for a 40-46 size motor I can recommend the "Turngy G46 550kv or 670kv electric motor. I found mine at " Hobbyking.com". As for the battery it requires a 5 cell lipo. Running with a 14x10 electric prop it will fly your 40 size model with vigor if needed. I'm not aware of a 40 size motor that will run on a 2 cell lipo. Hope I have been of some help.