Ok I have 3 Xcell 30's now...I was wanting to get a bit more power....I was thinking of getting an OS46 and the needed clutch, and Fan for 46. I was told that the OS46 tends to be lean in the midrange. Any truth to this?. Also If I had to go with another choice any suggestions? I was thinking about the Thunder Tiger 39H.


Thanks in advance...Ken

Yes their is truth to that , it can be fixed with a slight modification. Or you can go for the TT 39 which has a lot of power and so far no mid range problems.

Or the OS 50. I believe it is the replacement for the OS 46. I believe it runs VERY well also.


Later,

if you go with the os 50 you'll need the uniball clutch system and you may need to have steel pins installed in the fan hub by m/a. mine tore out the stock pins after 6 tanks because of all the power. i've heard some others haven't had the same problem, but be prepared. it makes an x-cell 30 a very powerful machine.

I just swapped the OS 32 in my caliber 30 for a TT39. There is a definite increase in power. While I haven't got that much time on it, it runs very smooth throughout the entire throttle range. It definitely won't compare to an OS 50 but it also doesn't require any other parts to install. It would be a direct bolt in to replace your 32.
basmntdweller

Bergen makes a heavy duty clutch for the X-Cell 30. It's the old style, though, with the shaft attached. The shaft is 6mm, so you'll need new bearings. Works great.

-Kevin

There are a good number of OS46 FXH's locally that are mostly installed in helis (26 at last count) that have the proper gearing for this size engine, the proper loading (600mm blades), and the proper location of the fuel tank relative to the needle valves.

They all run VERY WELL with NO leaning in the midranges!!

On the other hand, I have played with a few that were in helis with 30 size gearing and/or 30 size loading (530 to 560mm blades) and they ALL suffered from the lean midrange syndrome.

So let's be sure not to blame the engine for something caused by items in a heli that it was not designed to accomodate.

Fortunately for the reputation of the 80 and 90 engines, when they came out, they where being installed into 60 helis by more experienced and knowledgeable modelers who knew the importance of matching gear ratios and loads (longer blades e.g. 680 to 700 or 720 blades) in order to get the proper needle settings at hover and wide open. They were changing these at the time of engine installation. Consequently these engines did not suffer the false "lean in hover" reputation that the 46's developed because so many of them where initially being installed in 30 size helis (e.g. Raptor 30's) by the less experienced and knowledgeable of our bretheren who did not understand these more complex relationships.

Heck even some of the manufacturers didn't seem to understand these relationships either, as they made and marketed 46/50 size helis without addressing these issues. Of course this further caused undue blame to be put on the OS46FXH.

The only manufacturers that seemed to understand these relationships from the outset where Century and TSK, as their 46/50 size helis came with the proper gear ratios and for use with 600mm blades. The others all launched such units initially without properly addressing them. Only later did they discontinue these and launch newer models with proper gearing and loading.

I put the OS .50 in a ergo 50 with great results. Tons of power and smooth transition.

I put it in a ergo 30.