Hi i live in Utah and i bought a yard stik last year for christmas and the 280 motor that came with it didn't even come close to getting it off the ground. I am using the great planes C-10 esc (i think thats the name) the 10 amp one with a 4 channel receiver and then 9.6v batteries that are 750mah in a 2/4 pattern. when i changed from the regualer 6 cell battery that came with it to the 8 cell battery packs it actually got off the ground but couldn't hold it up because of a lack of power. So what i am wondering is, i've been looking at a brushless system with lipo batteries and im wondering what motor and speed controller and battery would work best for my application. One thing i don't understand is that the 280 motor that came with the plane said it did about 29,000rpm but then all these brushless motors im looking at are only around 4000rpm. Does it matter if the brushless spin alot slower? Thanks i hope you understand what im trying to ask.
Blake

Ohh and i forgot to say that i think that the reason it's not flying as well is that the elevation here makes the air thinner and so it doesn't get as much thrust and lift as in say california where the air is thicker. Is that correct or just a myth?

I don't fly EP so I can't be of much help as far as power systems, but as far as elevation goes, yes it does make a difference. What is the elevation you're trying to fly at?

As your elevation increases, so does the density altitude which is affected by the height above sea level (less dense the higher you go) and temperature. In basic terms, the warmer it is, the higher the altitude the airplane thinks it's flying at. So a plane that may fly good in Florida at sea level could be underpowered if you're flying at say 4000' - less air for the prop to bite and for the wings to develop lift.

Hogflyer

i live at about 4400ft from sea level and i found a couple of brushless motors ( http://cgi.ebay.com/RC-Hobby-4200-Ou...QQcmdZViewItem ) here's one that im wondering if it will work or not. If you have any knowledge about this stuff please let me know thanks.