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03-01-2019, 08:04 PM | #1 |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Holmes hobbies revolver sound
Hi all, I've been wanting to try out an outrunner motor in a crawler for a little while. I have seen quite a few videos about the revolver but the whining noise does bother me. I had a couple of questions. Is this noise from the windings or mechanical? Can this noise be tuned out by using a different pwm frequency? |
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03-01-2019, 08:11 PM | #2 | |
Quarry Creeper Join Date: Apr 2018 Location: US
Posts: 364
| Re: Holmes hobbies revolver sound Quote:
Sent from my Pixel 2 using Tapatalk | |
03-01-2019, 08:17 PM | #3 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Holmes hobbies revolver sound
I feel like the sound is likely from the motor being so open that it just lets the brushless noise out, but that just my guess. all outrunners have this particular noise. I've got one as does a friend and I try to use it at certain times of day avoiding late night and I also avoid running at the same time as my friend as it gets to be a bit much with 2 running. Thats not to say its terrible, videos seems to pick up the noise more than in person but I will say as you go faster the noise gets closer to a normal motor and it only does its sci fi sound effects at lower RPM range and it especially pronounced when you crawl super slow or give the throttle a blip. |
03-02-2019, 04:10 AM | #4 |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Re: Holmes hobbies revolver sound
Thanks for the response .. I was hoping that the videos made it sound worse than it was IRL. Not all outrunners make noise like this so I was hoping to mess with pwm to try and tune it out. Whether I have to use a variable frequency dependant on the motor rpm that can be done too! I have been working on firmware that turns a regular cheap quad ESC into something suitable for a crawler. I only have a 3650 four pole to test so far and have gotten pretty slow commutation.. I really want to try it on a nice motor.
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03-02-2019, 07:08 AM | #5 |
I wanna be Dave Join Date: Feb 2007 Location: South FL
Posts: 3,349
| Re: Holmes hobbies revolver sound
Holmes has an ESC with a "silent mode" that adjusts the frequency Sent from my LGMP450 using Tapatalk |
03-02-2019, 07:22 AM | #6 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,935
| Re: Holmes hobbies revolver sound
You're never going to make the motor quiet. Checkout Holmes videos. Even he doesn't have them running silent and he tunes his ESCs to specifically be as quiet as possible. https://youtu.be/VCuSbBoJ_sg |
03-02-2019, 07:23 AM | #7 |
I wanna be Dave Join Date: Sep 2011 Location: Douglassville, PA
Posts: 4,225
| Re: Holmes hobbies revolver sound
Mine's not bad at all during running and hard acceleration. It does "whine" quite a bit on trailing throttle and drag brake. I like it actually.. I do have another larger outrunner and it's exactly the same though a bit lower pitch.
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03-02-2019, 09:00 AM | #8 |
I wanna be Dave Join Date: Jun 2016 Location: Austin
Posts: 6,011
| Re: Holmes hobbies revolver sound
I've grown to enjoy the "Martian Moon buggy" sounds that emanate from my Revolver...
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03-02-2019, 09:39 AM | #9 | |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Holmes hobbies revolver sound Quote:
To me this says a lot to the performance of the motor and how easy you can tune out the sound. Or maybee he is getting old and can't hear the high pitches any more :P I think if you pair this with a SW4 you cand get some great bang for the buck. Last edited by Voodoobrew; 03-02-2019 at 09:43 AM. | |
03-02-2019, 09:42 AM | #10 | |
Quarry Creeper Join Date: Apr 2018 Location: US
Posts: 364
| Re: Holmes hobbies revolver sound Quote:
Sent from my Pixel 2 using Tapatalk | |
03-02-2019, 09:56 AM | #11 | |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,935
| Re: Holmes hobbies revolver sound Quote:
HUH? I can't hear you! I have one waiting to go in my TRX-4 Sport kit when they are released. Not sure if it'll get an SV4 or Mamba X ESC. Probably the Mamba X because the Auxiliary Wire is bad ass. Last edited by JatoTheRipper; 03-02-2019 at 10:26 AM. | |
03-02-2019, 11:59 AM | #12 | |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Re: Holmes hobbies revolver sound Quote:
Does Holmes make his own brushless esc? I did not see on on his site. Sw4 is still many times the cost of a cheap quadcopter ESC.. | |
03-02-2019, 12:12 PM | #13 |
RCC Addict Join Date: May 2015 Location: Price Twp.
Posts: 1,291
| Re: Holmes hobbies revolver sound
Friends with revolvers, do not get rail run invites anymore. The pitch of those things spoil the outdoor experience. |
03-02-2019, 01:23 PM | #14 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Holmes hobbies revolver sound |
03-02-2019, 01:30 PM | #15 |
RCC Addict Join Date: Feb 2016 Location: Santa Maria, CA
Posts: 1,751
| Re: Holmes hobbies revolver sound
I've got to agree with most of what has been said here. I've only been running my revolver for a week or so, but I generally run through a 2200 3s or 2 a day in my backyard. I'd say that as the speed goes up, the noise goes down, but if the throttle increases without a speed increase (high load) it gets noisy. Real noisy. Considering that my backyard course is almost entirely technical crawling, that high load, high pitch shriek is happening very regularly. I described it in another thread as the dying shriek of a small mammal! Now, I knew what I was getting into when I ordered this motor, but out of consideration for my neighbors, I haven't been running at night. Out in open spaces, it isn't as much of an annoyance, but it will still draw attention. My son suggested building a box around it that could be lined with sound deadener, in an effort to reduce the high frequency sound waves... he's 8! I'm tempted to stuff some ear plugs in the holes of the can to see if it makes any difference, if so, I have a more permanent idea up my sleeve. |
03-02-2019, 02:02 PM | #16 |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Re: Holmes hobbies revolver sound
So is this something to do with revolver's construction? Or is this the esc's using a really low pwm rate to start up ? Or both? It sounds like 8-12 khz whine which drives me crazy, I really can't handle that frequency it, even at a distance.
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03-02-2019, 02:09 PM | #17 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Holmes hobbies revolver sound Most of the motors make the same noise, but the revolver is just much better at it then other motors. It is just amplified is all. I believe it is because the winding are on the can instead of the Com. But im not super familiar with brushless design to know. But yes it's the design. It's an out runner thing.
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03-02-2019, 02:21 PM | #18 | |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Re: Holmes hobbies revolver sound Quote:
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03-02-2019, 02:33 PM | #19 |
I wanna be Dave Join Date: Jun 2016 Location: Austin
Posts: 6,011
| Re: Holmes hobbies revolver sound
If you aren't prepared for the sound, then don't buy one... I run mine mostly at a within-the-city-limits mountain biking park, and the clacking sound of their rear hub engagement pawls can be heard from much further away! It's funny how the more expensive the wheelset is on those MTBs, the louder they clack. I guess it's their version of some Harley riders "loud pipes save lives" thing! My MTB's mid-grade Shimano hubs are nice and silent... |
03-02-2019, 02:58 PM | #20 |
Rock Stacker Join Date: Mar 2019 Location: Canada
Posts: 60
| Re: Holmes hobbies revolver sound
I am not prepared for the sound.. that's why I want to fix it! It's a nice motor, it sucks if people are being turned away because of a choice of drive frequency.
Last edited by Alka; 03-02-2019 at 03:12 PM. |
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