I agree with Silversurfer, but let' start at the beginning. This engine likes to breathe, & Gary at Brison reccomends running this engine at 7200-7700 rpm. So, in my opinion, that's where it needs to be broken in. I broke mine witha NX 21-8 at 7350 rpm,& after 2 gal of fuel it was turning 7700 rpm. I then switched to a 3W 22-8[ it actually measures 21 1/2"] at 7250,& after 2 more gal it was at 7680. Now it was time for the MSC 22-8 at 6950. It also turns a BME 22-8 at 7070 rpm. Once you get an engine broken in properly, you can load it up a little with a meaty prop like the MSC & it will really perform for you. Just my .02.
There's not another 50cc engine in my area that will run with my 3.2, & nobody can beleive that the 3.2 is that strong.. but the tach doesn't lie.. & the performance in the air speaks for itself.
ORIGINAL: Silversurfer
I prefer the MSC 22-8 over any of the other props I have tried for the 3.2 on a 17-18 pound Extra. The Menz and Mejzlik 22-8 get "ripped" by the engine and neither provides the upline thrust or down line braking like the MSC does. I gave away my Mekzlik 22-10 after learning through experience that was not nearly as predictable through the rpm changes as the MSC 22-8, and that the MSC provided much, much better low speed airflow. At least I was able to maintain much better control authority at super low speeds than I was able to with anything else.
Agreed, the MSC 22-8 does not provide the higher rpm numbers of the others, but at the rpm levels it does produce (around 6,800 at S.L.) it appears to do so much more efficiently and effectively than the others I have noted. A 20-10 MSC will provide more rpm, but won't perrform as well, I assure you. The MSC 22-8 may be a lot of wood, but like some girls I've known it seems to have all the right parts in all the right places in the right amounts.
Pat