An 11x6 is way to much prop for a LA 46 try a 10x6 apc I learnt to fly with a Sr Falcon powered by a OS 40 back in the early 70`s and it had good performance using a 10x6 prop but it was hopeless with a 11x6 I currently have a LA 46 in a sport model with a 10x6 apc and has good performance using more than 10%nitro in the LA46 will not add any power to it I would reccomend you try a apc prop

John