Nearly a decade after the release of the original SCX-10, there is ample documentation and discussion on its gearing and appropriate motors for specific applications and driving styles, but I feel like I’m in the dark with the II. What is the motor to wheel gear ratio for the SCX-10 II? I’m going with a Holmes Hobbies brushless setup, but I don’t know what the ideal KV should be for a moderately fast, but crawling capable trail truck. I read that Harley is using a 3500KV 4 pole motor, but I don’t know how he came about that decision. It seems high for an SCX-10. Ideas? What’s your brushless motor and why?
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Brushless motor considerations for the II
- Thread starter Benbot
- Start date
magic_yeti
RCC Addict
you will find some thoughts from john himself in his review thread regarding the right engine for the scx 10 2.
http://www.rccrawler.com/forum/showthread.php?t=565422
Gesendet von meinem T1-A21L mit Tapatalk
http://www.rccrawler.com/forum/showthread.php?t=565422
Gesendet von meinem T1-A21L mit Tapatalk
OG Scx10 (trans) = 2.6 * Spur ratio (stock 87/20=4.35) * axle ratio (stock 38/13 =2.92) = Final Gear Ratio = 2.6 * 4.35 * 2.92 = 33.03 : 1.
Scx10V2 (trans) = 2.89 * Spur ratio (stock 56/15=3.73) * axle ratio (stock 3.75) = Final Gear Ratio = 2.89 * 3.73 * 3.75 = 40.44 : 1.
So in stock form out of the box the scx10v2 is already geared lower than the OG scx10. I still think that HH recommendations apply for the scx10v2. 2700-3500kv.
Scx10V2 (trans) = 2.89 * Spur ratio (stock 56/15=3.73) * axle ratio (stock 3.75) = Final Gear Ratio = 2.89 * 3.73 * 3.75 = 40.44 : 1.
So in stock form out of the box the scx10v2 is already geared lower than the OG scx10. I still think that HH recommendations apply for the scx10v2. 2700-3500kv.
I'm running the same setup, once I had my MMP programmed correctly it works great - some help from Bilinvic got in the right direction with the braking.
Set wrong it was like a drag car lol
new2rocks
I wanna be Dave
I'm running the Puller Pro Stubby 3300 on 3S in my first one and have been very (very) happy with it. I can pop the front axle off the ground on pavement, but the low end is very, very smooth (esp. with an expo throttle curve set through the BLE ESC). The running clips in my SCX10 II video are all real-time, so they should give you a pretty good idea of how well it runs:
https://www.youtube.com/playlist?list=PLNal6a84-MACmj9go943kzGeb1Agg1HbZ
The only thing I noticed was that the motor got a bit warm for my liking with stock gearing. To be safe, I dropped the pinion down a tooth, and it's been great.
https://www.youtube.com/playlist?list=PLNal6a84-MACmj9go943kzGeb1Agg1HbZ
The only thing I noticed was that the motor got a bit warm for my liking with stock gearing. To be safe, I dropped the pinion down a tooth, and it's been great.
LiqrSicc
Newbie
I run a Holmes PP 2700kv with a BLE on 4s. Not as fast as the 3500kv on 3s but plenty fast for a crawler.
Yes, it will fit. But it would not be an ideal setup.
Could you possibly enlighten me sir?
1967Typhoon
Quarry Creeper
I just wish more manufacturers would step in with waterproof sensored motor options. I like Holmes Hobbies and I will continue to support them, but having to fork over $130+shipping for just a motor is getting a bit ridiculous. I understand it if you are REALLY into crawling and you use your rig a lot, but there is NOTHING in the budget segment for sensored brushless crawler motors.
Duramarks
Quarry Creeper
How much difference is there in the 2700 and the 3300? I had the 3300 in my cart but i went with the 2700. Im starting to second guess myself because If it was too fast i could of changes the pinion. I will be running 2 and 3 cells. I don't own any 4 cells.
WheelinKing
Quarry Creeper
I run a Holmes BLE and a Puller Pro xl 3500kv on 3s. . Its a lot of fun and I have yet to break anything!
ElChupacabra
Rock Crawler
There's a reason for that. You can't get the low end control you need for a crawler in a brushless motor by compromising on the internals. On top of that you're asking for it to be waterproof which is another level of complexity. If you don't think that's the case then you either haven't driven a quality sensored brushless setup or you don't actually care about low end control as much as you think you do.
1967Typhoon
Quarry Creeper
Wow, you are making a LOT of assumptions there.
I understand the complexity and what it takes to make such a motor. The fact is though, ALL sensored motors have tremendously good low end control.
I think you overestimate how similar HH brushless motors are to regular sensored racing motors. You put in a much larger rotor for more torque, you pick a can with little to no venting, and you waterproof the sensor board using a conformal coating or an epoxy. That's it. That is the only difference. You make it sound like what HH is doing is rocket science. It's not. His motors are slight variations on what is already out there. If he can do it, other manufacturers can too. His pricing is high due to having to produce smaller runs, and also because he has cornered the market. It's no more complex than that.
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ElChupacabra
Rock Crawler
Wow, you are making a LOT of assumptions there.
I understand the complexity and what it takes to make such a motor. The fact is though, ALL sensored motors have tremendously good low end control.
I think you overestimate how similar HH brushless motors are to regular sensored racing motors. You put in a much larger rotor for more torque, you pick a can with little to no venting, and you waterproof the sensor board using a conformal coating or an epoxy. That's it. That is the only difference. You make it sound like what HH is doing is rocket science. It's not. His motors are slight variations on what is already out there. If he can do it, other manufacturers can too. His pricing is high due to having to produce smaller runs, and also because he has cornered the market. It's no more complex than that.
Tekin could be making 5 figure runs of ROC 412s and they're $20 more than a HH equivalent. I get economy of scale. I also get supply and demand. Maybe the demand just isn't high enough for china to be pumping out budget BL crawler motors. Didn't mean to make assumptions. Upon review I saw how that last post came out. I hate my life and I wanna jump off a cliff when I'm at my job so sometimes that inadvertently translates through my brain onto the internet... "thumbsup"
1967Typhoon
Quarry Creeper
It's all good. No offense taken.
And you are right, the demand isn't there. I think that in general, crawling is still viewed as a brushed motor arena. Hopefully that will change with time.
Tenshock tried to make a budget non-sensored 6-pole motor for crawling, but nobody has really reviewed one properly. There is no footage of really slow climbs to show how bad the cogging is. Allegedly the combination of 6-poles and low KV is supposed to limit the cogging greatly, but I will believe it when I see it. And I won't drop $50 to be the guinea pig lol.
And you are right, the demand isn't there. I think that in general, crawling is still viewed as a brushed motor arena. Hopefully that will change with time.
Tenshock tried to make a budget non-sensored 6-pole motor for crawling, but nobody has really reviewed one properly. There is no footage of really slow climbs to show how bad the cogging is. Allegedly the combination of 6-poles and low KV is supposed to limit the cogging greatly, but I will believe it when I see it. And I won't drop $50 to be the guinea pig lol.
svt923
I wanna be Dave
Speaking of Tenshock, the X211 is a great budget sensored motor and is available in several crawler suitable winds. I have been running one (the 2450kv version) for a few years that has been moved around to several vehicles. The power and low speed control don't quite match my HH Puller Pro but it was a noticeable improvement from the Trinity 2 pole motor it replaced.
new2rocks
I wanna be Dave
For what it's worth, I have significant wheeling time with ROC 412s replaced by Puller Pros on three very different rigs (OG SCX10, Wraith, R1 Frankenstein). As good as the 412s were, I found the Puller Pros to be noticeably smoother at startup and on the low end on all three rigs with otherwise identical setups. And top end was as good or better. That's why I've swapped all of my 412s for Puller Pros and use the Puller Pros for all of my BL rigs now.
The volumes in this hobby are minuscule compared to many other consumer electronics devices that we use (e.g., cell phones, tablets, laptops, etc.). Even for the biggest names in the hobby, most RC crawler components are produced in the hundreds or thousands, not tens or hundreds of thousands. That means vendors like Holmes Hobbies and Tekin that are committed to investing in continuous R&D and product improvements have to recover that investment over a relatively small sales volume. That's not going to change anytime soon. The chances that a budget vendor is going to be able to match or exceed a the quality of a vendor that invests in R&D the way Holmes or Tekin do are low, because they have no way to recover R&D costs through volume. That doesn't mean you have to spend a ton of money if you don't want to or are not able to. But if you want the benefit of the best performance and quality on the market at any given time, you're probably going to have to pay more for it. "thumbsup"
Sent from my iPad using Tapatalk
The volumes in this hobby are minuscule compared to many other consumer electronics devices that we use (e.g., cell phones, tablets, laptops, etc.). Even for the biggest names in the hobby, most RC crawler components are produced in the hundreds or thousands, not tens or hundreds of thousands. That means vendors like Holmes Hobbies and Tekin that are committed to investing in continuous R&D and product improvements have to recover that investment over a relatively small sales volume. That's not going to change anytime soon. The chances that a budget vendor is going to be able to match or exceed a the quality of a vendor that invests in R&D the way Holmes or Tekin do are low, because they have no way to recover R&D costs through volume. That doesn't mean you have to spend a ton of money if you don't want to or are not able to. But if you want the benefit of the best performance and quality on the market at any given time, you're probably going to have to pay more for it. "thumbsup"
Sent from my iPad using Tapatalk
