Went to my LHS yesterday, they suggested 11x6 for break in and 12x6 for normal run. I have a bunch of 11x6 Master Screw for the break in, but bought a 12x6 APC to run. I hear (from quite a few people) that the APC are a better/quieter prop. True? Are my prop sizes correct?

prop chart

Adrian,
Thanks for the chart!! I have been reading different threads in this forum and just didn't get the mathematical processes. I guess I am just not clear on them. This chart will certainly make it easier. Adding the Engine Instructions that come with it will sure make it easier to determine if the prop I choose is the right one.

esanger:
this month " Model airplane news" ( MAN) dedicates a big articule to 60 2-s engines, that includes props, I suggest you to get it and save a lot of time.

I read it and was disappointed to see how they rated the OS 61!!! I mean, I only paid $100 for the engine, as compared to $150 from Tower, but still I was under the impression OS led the industry...

Also, I am going to go with an 11x6 for break in and a 12x6 for normal running.

your os will do just fine and it's the engine everybody wants to beat.

It last longer too!

I am using the 12X6 on my 61 with great results. I have it on an Ultrastick 60, it flies great.

I tried an 11 x 7 but prefer the 12 x 6.

Sounds like we have a consensus here!

I love this Bulliten Board! I tell everyone about it! You guys a great help!!