ORIGINAL: Rcpilet
And your DA50 turning 6800 RPM with a 22-8 won't do the trick on your 16 pound airframe-- get more cubic inches--a G-62 or a ZDZ 60 will do it just fine with a 22-10 prop around 7000-7200RPM. No substitute for more cubes.
Good luck with it.
It is a new engine and I am running lawnboy ashless 32:1. I am only planning on the 22X8 for break-in to keep the R's above 6500. Once broken in I will switch to the MSC 23X8. I have already run the engine with it and was getting 20 pounds of thrust...I don't foresee a problem with vertical performance - I just know it will be lacking compaired to sea level.
I also feel I may have some performance issues with the engine, as it has hardly any compression and just sounds weak. I will not know for sure until I get the 22X8 on it and tack it. I am running the hyde cannister and should get a 100-200 rpm increase out of it over stock. I also have the stock muffler and will do some tests with it...we'll have to see.
I only have to deal with this altitude for 5 more months, then it's back to Cali for me!