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Old 03-19-2014, 06:22 AM   #721
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Hey everyone, having a little issue with speed and fading with my Mach 2 17.5 blinky. Geared 3.70 w/42 deg timing, 40mm fan, 6200 65c Turnigy A spec batt. Bearings good, drivetrain free. 80x35 ft carpet, somewhat technical track.

I am lacking a bit of straight line speed compared to many other guys and I get serious fading about 3:30 into the main. The motor comes off about 165 on the endbell after 5 minutes. I had read that the Mach 2 seems to like a higher numerical fdr with more timing, so I was going to give 3.86 and 49 deg timing a shot--the only issue is that my Mach 2 only has enough clearance to go to 42 degrees!! To physically get to 50 deg on the can I would have to open up the timing slots with a Dremel, I don't want to do this as I understand altering the motor can in any way is illegal.

Does anyone with a recent batch Sonic Mach 2 have "artificially" limited timing? I am physically maxed out at 42 and would like to try more.
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Old 04-04-2014, 07:55 PM   #722
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Originally Posted by Rick Hohwart View Post
I am biased so I won't go into performance aspects because of course it is FAST!

But two aspects of performance stick out. One, the motor runs very cool which prevents fade especially in the stock classes where motors can run hot and fade toward the end of the run which results in slower lap times (on road) and the inability to clear obstacles (off road). And two, they are very drivable in the modified classes. The power band is very smooth so drivers who race both on and off-road appreciate the motor's feel.

Overall it is a very good, fast motor. It is backed by an excellent long standing company inthe R/C industry with team drivers available to assist with gearing etc.
hi I have 13.5 are they a torque motor or rpm motor
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Old 04-04-2014, 08:02 PM   #723
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do the mach2 motors have timing at the 0 mark on end bell
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Old 11-02-2014, 01:39 PM   #724
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I'm very frustrated with a reedy sonic 550 5.5T part 971.

Is connected with a brushless ESC Ronitronic Speedstar Brushless.

The problem is I CAN"T REVERSE.

If i reverse from transmitter ESC is not reading correctly the calibration and is not commanding at all.
With transmitter normal i can calibrate successfully put the throttle is reverse and brake is braking.
I also try to reverse from the 3 phase leads on motor with no success. All combinations causes a strange sound in the motor with no movement. The only compination working is normal ABC orange, yellow, blue.
Also i have tried different transmitter with same result.

Please HEEEEELP.
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Old 02-01-2015, 06:39 PM   #725
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Hey guys, I've got a few questions about a Sonic 21.5 I've got. The motor was making a bit of a racket, so I took it apart and found a piece of metal stuck to the rotor. I cleaned it up and replaced the bearings. I figured while I had it apart, I'd chuck in a mod spec rotor from a 10.5. The dimensions are the same, but I'm wondering what positive/negative effect this might have. Is it normal for the motor to be a bit noisier with a mod rotor? Am I about to cook this thing?
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Old 02-01-2015, 06:41 PM   #726
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Don't know but that is illegal.
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Old 02-01-2015, 07:34 PM   #727
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Don't know but that is illegal.
Please tell me you're trolling and not genuinely dense.
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Old 02-01-2015, 10:06 PM   #728
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Please tell me you're trolling and not genuinely dense.
I think he is right, the mod rotors are a different internal magnet size (also different part numbers) which makes them illegal to use in stock.

The mod rotor will give you more torque or rpm, I can't remember which one it is.
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Old 02-01-2015, 10:19 PM   #729
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Thanks. I appreciate the warnings, but I'm not concerned with legality in a stock class. I'm just messing around with motors.

As I understand it, varying the size of the rotor will give you more rpm or more torque, based on whether you go down or up in size. In this case, they are identical in size, but have very minor visual differences. EG: The rotor from the 21.5 has a logo etched on the magnet section and a part number on the output shaft. The rotor from the 10.5 is completely unmarked, but has shows evidence of being balanced. Reedy sells a stock and a mod rotor in identical sizes, as well as smaller and larger models.

Only testing will tell, I suppose.
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Old 02-01-2015, 10:20 PM   #730
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As long as it's came from a Spec 10.5 then you should be able to run the rotor. Just be careful, there are Mod 10.5's and Spec 10.5's.

Mod Rotor #987, #957, or #958.

Spec Rotors are #954,#955,#956.

If legality isn't an issue, then go for the 13.0. Torque is king, especially in 21.5 racing.

Edit - Just saw your post now.
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Old 02-02-2015, 03:51 PM   #731
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Interesting - Just got an email back from Reedy. The 10.5 rotor has a slight smaller center shaft, allowing more magnet to fit in the same sized rotor. More power, same size.

No word if it's a good or bad thing, though.
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Old 02-02-2015, 03:56 PM   #732
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That makes it one of the mod rotors. Spec rotors have a minimum shaft diameter.
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Old 02-02-2015, 04:20 PM   #733
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Quote:
Originally Posted by monkeyracing View Post
Please tell me you're trolling and not genuinely dense.
Why would I be trolling or dense? 21.5 motors are rarely used for bashing. Bashers like more power. Most 21.5s are used by people running VTA, USGT or some other type of spec racing so it's only natural to assume you are racing and that rotor is not legal in any sanctioned 21.5 spec racing in North America. If you're not racing, run it and have fun.
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Old 02-02-2015, 04:56 PM   #734
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Sorry, Wingracer. Poor choice of words. I'm just messing around with motors - learning how they work. There's an incredible scarcity of information on a lot of rc related subjects.

This isn't going into anything specific, btw.
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Old 02-23-2015, 07:28 AM   #735
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I have a Reedy Sonic Mach 2 8.5 which i was running in 2wd buggy, was running great and didn't get over 125 F. Hasn't done that much work but it started cogogging, tried other sensor cables, didn't fix, so tried another motor and everything else is fine.

I assume this could be a sensor board issue, so looked for a replacement on rc10.com, couldn't find one....

Does anyone know where I might get one?

Thanks!
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