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.

The 11 is the lenght and the 6 is the pitch. So this prop should make the plane fly a tade faster, but it will be fine for your nexstar.

a 11/6 will be fine,if anything your going to get more speed out of the 6pitch than a 5pitch,it should't make that much difference for you though.
when I first started out with my NEXTAR I busted 3or4 of those props so I got a bunch since they were cheap 2$ea. now I use them for my .46 sport plane they work pretty good.
I don't think I busted even one more after I bought all those of course.
the NEXTAR is getting a over haul right now,OS 61,new covering, and floats, can't wait for the refirb.