Crawler Canyon Presents:

I've been mentally compiling some questions people have had about servo tests, and then threw 'em all in a pot together.
How much torque does a direct power servo lose as the battery goes down?
What's the difference in output between unlimited amps and what's supplied by a typical BEC?
What happens when you test the stall of a high amp drain servo when powered by a typical BEC?
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Links
DS 3225 SG (the Amazon Blue Case) amzn.to/3F0qLhN
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DS-B009-C www.aliexpress...
RC4GS amzn.to/3rykpTA
1080 amzn.to/469NBzB
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[@Ideal1980]

I would have liked to see the blue case at 6 volt, because many escs can only do 6

[@brianmorrison2846]

How about a SCX10 iii base camp kit, w/dig. Dlux shocks, ZOKU chassis. Jconcepts power wagon body with a Halloween theme? 🤙

[@SuperDrake79]

Same 009 servo, Rhino esc; results on amp pull reading via power supply “?” I have feeling it’s reading the surplus amp draw that the ESC can’t handle.

[@rccrawlingaddict207]

The capacitor in the esc is the key.

[@derrickhays3627]

Love it when unexpected results happen, So unless you're comp crawling continually why pay the money for direct power when there's plenty through the internal bec? Thanks as always.

[@CrawlerCanyon]

I'm still a direct power guy. At the same price point, a 3S-direct servo is usually gonna make ~20% more power than a 7.4 or 8.4 volt RX powered model. \ Direct power is also nice when builds have ESCs with either a vey weak BEC, or no BEC at all.

[@derrickhays3627]

@@CrawlerCanyon I see your point, I use a eco power one but I trawl it does the thing. Hey you ever test one of those? Thanks for the info.

[@TJussilainen]

You should ad volt meter to measure bec output. And did you know hairbun is a rolled mesh tube. it can be un rolled and adjusted to new size......

[@drtmi8789]

I run a Holmes SHV v2 at 4s direct in my TRX-4, and a Savox 1231 at 6v on my SCX 10II. May have to look into that AGFRC if I ever want to run my 10II again as the TRX4 is way better on the rocks. I also only run XT30 connectors on all 5 of our rigs, including the brushless TRX4.

[@lastcreations8845]

weight, grip/scrub, longevity. quality 35kg on 5lb and lower is about maxed stressed to longevity, as you go up in weight to gain back some longevity and usefulness without stall out, have to increase kg at higher rate then % of weight difference. Higher kg to weight the better for longevity (ideal thought)

[@meirdeaph]

Awesome i can't get enough of this place ❤

[@A-a-ron01220]

I'd love to see you test the gxservo x80pro. Apparently a 80kg servo at 7.4 volts. About 50 dollars. I doubt 80kg very much.

[@CrawlerCanyon]

I would join you in that doubt, as 80kg is like 1150oz or something, and nothing I've tested in a "standard" servo has touched that yet. Getting over a thousand is usually $130+.

[@A-a-ron01220]

For 50 bucks and being brushless if it atleast makes 45kg id be pretty happy@@CrawlerCanyon

[@DIllybarification]

Can we get a test of the 9imod 70kg? It's like $52 on ebay.

[@HVT03]

A dyno for rc motors will be amazing for sure (for rigs too, but for crawlers i dont think it will be needed or interesting) Now im wondering what would be the numbers while testing 2 servos (like in a 4ws rig) at the same time, running with the 1080 BEC

[@badcredentials4230]

Mate, incredible results. I’m so surprised to see the 009 be more consistent and less map hungry when run through the ESCIBEC. Pretty big power too, I managed to find it on Ali for $50au which is.. $7us so it’s up there for kg’s/$. Looks mint too!

[@badcredentials4230]

And I love the servo tests. Keep them coming! I was wondering what the average breaking strain for a rod end could be, maybe the jig could be modified to see what a traxxas/element/axial/vanquish etc end starts to open up at or squashes at. The highest output servo I’ve ever run was the flash 45kg and I ended up damaging my steering link on a bind, would be cool to see where those numbers were and if there was an average to it. Own an element, don’t go over 35kg etc..

[@CrawlerCanyon]

I use Jato/Revo ends on the test rig, and have only managed to tear one-- when I put some monster servo on there with the rod attached at 16mm-- so the rod end broke at like 1400oz-in. A great number of my rigs are still running Blitz ends, which are 4.8mm ball cups-- and I've never managed to even pull one of those off. I'm not sure how to replicate the situation where rod ends break. The end that I've had break on multiple occasions is the front lower link ends where they attach to the skid-- but I think that's because scraping against the ground wears/weakens the ends until they fail.

[@badcredentials4230]

@@CrawlerCanyon whoa that’s monster torque! Fair enough, I might have had the same situation where it had worn a bit as it was out front and rubbing on stuff to weaken it as well. It’s crazy to think how such a small interface can take all those kilos.

[@drtmi8789]

There are stand alone motor dynos available.

[@carlosf430carlos2]

can you test the GXservo QY3240MG?

[@CrawlerCanyon]

You'll often hear me mention the Amazon blue case, particularly the 35kg version that has a transit speed around 0.14sec/60º. The GX 3240 has a transit speed of 0.22sec/60º. That is WAY too slow. Even at the AliExpress price of 14 bucks a pop. We need a bit of speed. I prefer a servo in the 0.10 to 0.12 range (optimally) which is literally twice as fast as the GX. That slow is basically a non-starter.

[@marksaxton4760]

I would like to see the results from from say running a 60 to 70kg servo through a 1080 G2. What kind of amp draw would show us from that? Would it take a big hit or not? Compared to straight battery feed.

[@CrawlerCanyon]

The Flash Hobby 8.4V 60kg servo is usually about $10 more than the direct-power version, which is why I've never bought one. The servos claiming 70kg are playing funny with the numbers I think, as that's close to 1000oz-in, and you don't get that for 70 bucks. I've only ever had two servos hit 4 digits, and they're both $130+. I have an 80kg servo coming in the next few weeks, if just to see how inflated that number is.

[@EddieDesigned]

I think it may be time for a complete servo line up retest. It'll be a lot of work but the before and after results would be very interesting. Besides, the test rig has evolved since the first tests and it'll only be fair for those early servos to have a more upto date results sheet :) Dyno results for the motors would be great to see too!

[@CrawlerCanyon]

A great number of those servos are gone, or were on loan for testing. I think I have maybe... half?

[@johngisbourne7197]

​I'd like to see a servo best off talk like you did with shocks. Would be very helpful. Greets from Bavaria ​@@CrawlerCanyon

[@marksaxton4760]

Iam wondering now is the straight esc just as good as the straight battery hookup?

[@CrawlerCanyon]

Well, on the bench I'd say they're very close. But out on the course, the ESC has to handle all at once, from throttle to steering to whatever other accessories are in use. The direct-power servos are going to be more efficient, as there's less steps to go through, and less loss. So side by side, two servos with identical numbers, but one direct-power and the other RX power, the battery will last longer with the direct-power model. I'm not rushing out to replace all (or any) of my direct power servos with RX powered models just based on battery-drain related power drop. I maintain that there's a lot more versatility to direct-powered servos-- particularly in cases like 4WS. I don't recommend running two steering servos off of an internal BEC. It's not great.

[@Juacocb7]

Hey man, thanks for all ur videos, what about trying an external BEC? Like the castle ones.

[@CrawlerCanyon]

An external BEC should behave exactly like the power supply-- but I guess I don't know until I know. I don't think I have a CC-BEC not in use, but I'm pretty sure I have one of those Henge 8A (12A peak) units. Might be worth a try, just to see if the numbers move.

[@Tyrells_Tiny_Trucks]

With all the rigs that get built, I'd love to see a straight axle front/portal rear rig come from the workbench

[@lastcreations8845]

kinda not worth it... you can move cog and lose the rear drag due to clearance, but easily make up for it on a true portal portal with weight bias placement, and gain front clearance.

[@CrawlerCanyon]

It's in the pipeline, I already have everything for it, save for a chassis. AR44 front and AR45P rear.

[@brianmassey7563]

@@CrawlerCanyon just built one with that axle combo using an all metal amazon reverse output trans....works but it's too heavy for what I want. Also, the AR45p rear was updated at some point, and I think the max I could do for portal gears was the 14/21, and that's proven to be too much for a really light weight rig. I think I need to add some underdrive to the diff.

[@nicholasstephey8475]

I would suspect the test rig. Add a volt meter to the output side of the pot to see what is actually going to the servo

[@CrawlerCanyon]

so... suspect... what, exactly? That the power supply is overstating the amps drawn when servos are powered directly off of the power supply and/or board, and understating when it's powering the ESC? I don't see how either of those things could be happening, but I can't say for sure that they're not.

[@Skiddelzzz]

Dyno would be fun!

[@WreckitRalphie]

I just bought the betu 35kg off Amazon.

[@CrawlerCanyon]

I've never tried any of the BETU servos. I always just fall back to the trusty DS3225SG, as it's never let me down. I should try the cheap 35kg BETU option at some point. Slightly concerning that nowhere could I find any kind of claims of transit speed.

[@mclarenf115]

keep the servo test coming. also, which rod ends do you recommend. I've been using boom racing and traxxas.

[@CrawlerCanyon]

I use almost exclusively Traxxas and Element. I really like the Element ends, as they have just the right amount of angle-- but the tradeoff is that they're thinner and more likely to pop off or tear. I really like a mix of the TRX-4 ends (TRA8275) and the Traxxas "long" ends (TRA5525.)

[@mclarenf115]

@@CrawlerCanyon thank you. I'll check them out.

[@FaithSaraG]

So, BEC is a voltage regulator. Your BEC will provide the same voltage to the servo regardless of battery voltage. Your amp readings at 12.6 volts when feeding the ESC are not the same as what the BEC provides the servo. Remember Ohm's law? That 2 amps at 12.6 volts translates to 3 amps at 7.4 volts. How the hell are the servos making the same power on 3 amps as they do on 6 or 8 amps? I don't understand that either. Dyno thoughts: take a look at Torque Test Channel's drill dyno. You could maybe copy that with bike parts you have lying around?

[@Prince_Pig]

I've got that AGFRC servo on my Vanquish. Love it. And a fan of AGFRC servos in general. They make a lot of servos, and the service I get is pretty good. Had one replaced with little hassle.

[@jarek.o2663]

Greate video! I didn't expect that capacitors in ESC can so much reduce current drowning from battery. That video shows more true data than connection just to power supply. To make it more realistic, you can install a propeller on the motor shaft.

[@jmitch3008]

Made the call & a Canyon membership is not part of my $75/month rc budget!

[@brianmassey7563]

thank you for that. Makes me just as interested and confused as you seemed to be. I have servo to send you that challenges my BECs, but I want to get some inserts printed so you can test some along with a tire you haven't done yet.

[@NEO-RC]

I just picked up a AGFrc servo, the A86BHMW (55kg @ 8.4, 49kg @ 7.4 claim). It was pretty pricey so I’m glad to hear good reviews. I’ve never bought a AGFrc servo before, hoping it was worth the money.

[@CrawlerCanyon]

AGFRC makes some great servos, I've never has an issue with any of mine-- I have 7-8, I think. I did the test on the A86BHMW awhile back, it did really well. It's the servo in ICFTW #21.

[@NEO-RC]

@@CrawlerCanyon excellent! I’ll go watch that episode. Thank you sir! 👍

[@Andy_Yates]

@@NEO-RC I have 5 AGF servos. 2 in crawlers and 2 in drift cars, and one in a touring car. I have a spare if or when the Savox in my Associate buggy gives up its ghost. They are great servos. The A81BHMW in my TRX4 is a beast, and you ordered the A86. It'll be awesome I'm sure.

[@Rombo-86]

I would see my self as a pretty good understanding in electricity’s. But I can not understand how it can make the same torque with less amps and watts 🤔🤔 what are we missing here?

[@NEO-RC]

@@Andy_Yates good to know that I purchased a reliable servo. Only been running RC crawlers (RC in general, all I have are crawlers) for a couple months. So much to pick from and learn. 😅 I try to buy good components so I don’t have to redo work later, BUT tinkering with these things is damn fun.

[@OGRadGrow]

Awesome comparison and servo dyno. Nice 👍🏾💯

[@StubbsRC]

I can't stand the bec guysc argument. So you'd rather limit yourselves to 7.4v instead of having between 12.6 and 9.9v? Makes no sense to me. Oh and bec amperage...

[@Chuck-w4c]

Is there anything to the idea of running the (insert random servo) on the canyon course in the heat of the day to get it “up to temp” and then toss it on the rig to see numbers at various volts?

[@CrawlerCanyon]

Well, you definitely had that idea too late. We're at the very end of summer, and quite likely won't see anything past low-90s this month (and only a few days at that,) and we're into "winter' after that, so 60s and 70s.

[@Chuck-w4c]

Yes, of course, more of a theoretical at this point but you didn’t really want to do it in the hellish midday heat of desert summer anyway right? I assume it would be likely to cool enough during the re and re time to make it a fools errand anyway…no offence intended, I know you can pull a servo in record time…

[@CrawlerCanyon]

@@Chuck-w4c of course much later on I thought... I could just put the whole servo tester rig in the sun.

[@drowildcat2960]

Love servo testing videos Even though I do not buy these cheaper servos great info 🥇

[@CrawlerCanyon]

Where's the line for "cheaper" stop, and the servo become "expensive?" For me I'd say 100 bucks. Anything over that is expensive. I wish they were all $25, but I'm okay up to around $60. Anything above $100, and I have more than a few, is a combination of torque/speed we don't need, and warranty/support rolled into the price. I'm fine with a 600oz $50 servo with no anticipated support after purchase. Because if you want that CS added, you can get a Reefs for double the money. Same performance, though.