I need a new prop to go out flying tomorrow but the LHS that I shop at rarely has any 11x5 prop's.Since I dont have time to order some what would be the closest replacement? I would rather loose a little speed and gain a little thrust then the other way around. The clerk sold me a 11x6 and said it woul be about the same but I cant remember for the life of me which one(pitch-lenght)gives speed or thrust.Thank you in advance.