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Old Jun 24, 2010, 08:45 AM
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USA, NJ, Mt Laurel
Joined Oct 2007
3,691 Posts
I hate to dig up old stuff but i want to discuss the advantage of rotor/stator diameter with regards to "spooling up" and potential to spin larger diameter props.

Most 4 pole inrunners have smaller diameter rotors and smaller inner diameter stators @ somewhere around 14mm and 15.5mm respectively, 6 pole inrunners have 16mm rotors and 17.5 stators respectively.

Keep this in mind when you read this post by our friend Mopar and draw your own conclusions. I know the kv was different on both motors but if we got a hold of a NEU 1110 1.5y we could do a ARC to Neu to MEGA head to head to head data comp.


Quote:
Originally Posted by moparmyway View Post

APC 6x4 sport prop
4s-5000 (30/60c)
CC 125 Phoenix (all power settings @ default)
Stock Stryker with NO CF, NO glass, stock elevons, HS65mg's

MEGA 16/25/2..............................................ARC 28/48/1.5

1 second into launch

32,467 RPM............................................... ...32,608 RPM
15.21 volts............................................. ......14.61 volts
86.22 amps.............................................. .....102.68 amps
1311 watts............................................. ......1500 watts
27 mAH out of battery.....................................37 mAH out of battery


Vertical climb

30,120 RPM............................................... .....30,487 RPM
13.94 volts............................................. ........13.91 volts
73.39 amps.............................................. .......88.23 amps
1023 watts............................................. ........1227 watts
2164 mAH out of battery...................................2160 mAH out of battery

Static test at end of session

30,487 RPM............................................... ......31,779 RPM
14.09 volts............................................. .........13.99 volts
80.38 amps.............................................. .......92.82 amps
1133 watts............................................. ........1299 watts
2306 mAH out of battery....................................2390 mAH out of battery

**NOTE**
Both of these flights (MEGA and ARC) required me to hit the stops on the right stick. The stock elevons and NO carbon fiber caused this Stryker to corkscrew and flutter. There wasnt enough stiffness to get to top speeds and see about unloading. I would need wooden trailing edge, elevons, and some CF before I try the same test again.

Draw your own conclusions
Here is mine...................
1. The ARC (135 f) was heating up ALOT more than the MEGA (80 f) (FLUKE IR temp gun)
2. I believe (based on motor temps and rpm performance) that the ARC was at its limit. There is no way to prop up to a 6x5.5 E without worrying about motor failure. Not the same case with the MEGA
3. MEGA was louder
4. Both motors flew just about identically, I couldnt really see much of a difference, except that the MEGA spooled up faster when nailed compared to the ARC spooling up when nailed, and the ARC had to land much sooner than the MEGA did.
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