|
<meta content="text/html; charset=utf-8" http-equiv="Content-Type"><meta content="Word.Document" name="ProgId"><meta content="Microsoft Word 12" name="Generator"><meta content="Microsoft Word 12" name="Originator"><link href="file:///C:%5CDOCUME%7E1%5Cgwylie%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml" rel="File-List" /><link href="file:///C:%5CDOCUME%7E1%5Cgwylie%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx" rel="themeData" /><link href="file:///C:%5CDOCUME%7E1%5Cgwylie%5CLOCALS%7E1%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml" rel="colorSchemeMapping" /> I wasonly able to get 6 batteries out of this motor before I had a brain fart andlost orientation and wound up trashing the entire heli. The reason for trashing the heli has a lot todo with the superb amount of power this little motor produces… The Motor went into an EXI 450 with a metal head and tail, CF mainblades and plastic tail blades. I have switchedthe main gear to an Align 450 gear and I am using 2100 mah 20c batteries andMystery 40A SBEC with a max current of 60A. I am also using JR servos and a G401B gyro. The motor that is being replaced is a Red colored3500kv motor rated at 350w (if you search around you will find this motor) witha 13T pinion.
Here is my initial reaction and observations to what I consider real worldtesting (no scopes or tacks, just good old observations).
My initial reaction of the motor coming right out of the box, was very pleasing. Actually I was very impressed with the packaging. The motor came in avery nice foam holder inside of the box. Supplied items were the motor, bulletconnectors, 12T pinion and shrink tubing for the wires. The set screw wasnot in the pinion so make sure you are careful opening the baggy and don’t loseit.
When it came time to solder the connections fort eh battery leads as well asthe bullet connectors, the wires came pre tinned which was also nice to see.
Installing the motor in the heli was a bit more difficult as though the Blackand chrome look very nice, the black makes it harder to see and ultimately lineup the screws of the motor and the mounting plate of a 450 class heli (StandardEXI 450). I would also like to note thatthe motor comes with two different bolt patterns and each of those has its ownbolt size. I would be guessing at the actual thread size and soI will leave that alone. Out of my assortment of stuff, I did have mountingscrews for both sizes and so it made it a mute point. It would be nice ifthe motor came with bolts that fit at most of the 450 size heli’s, as this iswhat the motor is supposed to be used for and it would only cost a few cents toadd to the package.
Once installed and the gear mesh was checked, I took it outside and ran itup in my Normal flight mode which is about 65% throttle at hover. First impression was a very smooth spool upand it was much quieter than the motor it replaced. After hovering for a fewminutes, I flew a few circuits and at that point I was comfortable to goto Flight mode 1. (I have3 flight modes programmed –Norm flight mode is lower power and a bit more pitchyielding lower rotor speed for generally longer flights - flight mode 1 and 2are the same throttle and pitch settings when the TX stick is above mid stickbut differ on the lower end – Flight mode 1 returns power to 0% at low stickand flight mode 2 increases to 100% at low stick for 3D). Flight mode1 is where I initially noticed the increased power, you could hear it! I saw absolutely no decrease in rpm of therotor blades no matter what I did. Onething I did notice was that the increase in torque this motor provided wouldover power the tail and in order to compensate, I will have to move the balllink farther out on the tail servo arm (right now the ball is about half way betweenthe inner most hole on the arm and the servo arm mounting screw). The increased torque is due to the increase inwattage up to 450 and the lower 12T pinion. After afew minutes I was comfortable moving to Flight mode 2 and pushing it prettyhard. I cannot go inverted but I cangive it a pretty good thrashing as far as g-forces go. And like I said above, there was nothing Icould do that would slow this thing down. After eachflight I checked the temperatures of the Batteries, ESC, and motor. The motor was cool, the ESC was luke warm andthe battery was just a bit warmer than the ESC. Lastly, I would like to note, my flight time increased about 1min and I suspect this is due to going from a 13T to a 12T pinion relievingsome of the stein on the motor and esc. Only thing that has not been verified is the longevity of themotor and how well it will last. Running40k plus RPM is hard on shafts and bearings so time will tell. For the $15 from DX, I would recommend this motor to anybodyand everybody at this point. I will getsome more flight time on the motor and update if anything changes.
< Message edited by grawyl -- 6/11/2009 1:13 AM >
_____________________________
There is an art to flying an RC Helicopter. The art lies in learning how to throw it at the ground and miss.
Hide Signatures
|
Search This Thread
Printable Version
All Forums >> RC Helicopters >> Electric RC Helis >> hobbymate 3800kv brushless motor 
hobbymate 3800kv brushless motor - 
its amazing how a little competition from HC has forced xheli to react. in the end we win!!
but then again i ordered them on Friday and tracking shows its left their facility that day for transit 
should be monday or tuesday for her maiden voyage.
i'm going to run them in a series as a 6S pack. I can get a flightmax 2650mah 25c 6S for $75 bucks. this place is not HC but actually in the U.S. pm me if you want the link for the lipos. 
