rccars4sal wrote:For batteries, as long as its a hard case 2s lipo, then it should fit both slash and losi 22. For the motor, it all depends on how much you want to spend. My brushless motor esc combos regularly run about 60-70 dollars, and can be as fast as a 175 dollar set up. Just depends on motor specs(winds).
Ive been wanting to do a ground based fpv vehicle. Im thinking slash might be too fast for what I want to do though. I was going the other direction,, possibly a 1/16 scale tank chassis that moves about 7 mph, but can overcome difficult obstacles.
That's a cool idea!
What would you suggest for motor/esc combos for 22SCT? I had picked 17.5 because it seemed like an OK mix of performance and suitability for pavement. Would a different motor work better and cost us less?
Once again, it depends on your budget, and your shopping preference. If shopping local, and having a big budget, then any brand brushless system will be fine. 17.5 turn is a good medium quick set up. Faster than many old brushed systems. For servo, Im using a tactic 20 dollar servo in my slash. its got metal gears, and ball bearings, considered "high torque", and it dosent have any weird feedback into the system like some high dollar servos might. For radio, just make sure it has end point adjustments, or travel adjustment. It makes set up easier. I would highly recommend shopping around for brushless systems and lipo batteries. By getting a non main stream brand, you could possibly buy 2 -3 set ups for the price of a big name brand set up.
turnigy, ezrun, tacon are brands of brushless motor esc systems that are proven good, fast, reliable, and cheap.
Another consideration for radio set might be to go with a multi channel stick radio. How many functions will you need to control from the transmitter?
The ultimate initiative is be to control the car entirely using custom hardware that would take the place of the R/C receiver. The "Transmitter" would be an iPhone/Android, iPad, etc.
But I will have a Futaba 3-channel setup as a backup and to control the car during development.
This is what we will have onboard the "fast" car (22SCT)
* Tekin RS Gen2 ESC/10.5 Sensored BL Motor combo
* Futaba 3PM-X w/receiver
* Savox SC-1258TG servo
* SPC 5000mAh, 40C, 2S LiPo batteries
I know with the Tekin this is slightly "high end" but my time is an expensive commodity so I'm hoping spending a bit there will prevent me from having to switch out parts or worry about failure in the field. Our custom hardware will be complex enough, I want to be able to simply trust the essentials (ESC, Servo, Motor) to "just work".
Pretty much the only issue I have with rc electronics these days is compatibility between the steering servo and the rx/ esc. Heres what I run into. The servo might be a higher amp draw, and the rx might be sensitive to low voltage,, and the esc might have a weak bec. So, what happens is the servo will overload the bec, causing momentary glitch. Sometimes the servo will only partly respond, or it will self center(fail safe?) I have certain servos that do not like certain rx, or ESCs. Also, some servos tend to produce more feedback and some RX do not handle it well at all. Mostly high dollar, high power servos with these issues.
So, probably going with all high end components might reduce that chance of happening,, but no guarantees! If you do run into a problem like that,, first thing to try might be a different servo. As for the individual components just working,, they pretty much all just work anymore. Alot of the name brand stuff is either re branded Chinese product, or produced by the same over seas company specifically for the name brand.
Another remedy IF you have compatibility issue, would be to use a capacitor on an extra channel on rx. It might be a good idea to make sure there is plenty of current for all the electronics considering the extras you are adding. External bec, for the extra circuits?
rccars4sal wrote:Pretty much the only issue I have with rc electronics these days is compatibility between the steering servo and the rx/ esc. Heres what I run into. The servo might be a higher amp draw, and the rx might be sensitive to low voltage,, and the esc might have a weak bec. So, what happens is the servo will overload the bec, causing momentary glitch. Sometimes the servo will only partly respond, or it will self center(fail safe?) I have certain servos that do not like certain rx, or ESCs. Also, some servos tend to produce more feedback and some RX do not handle it well at all. Mostly high dollar, high power servos with these issues.
So, probably going with all high end components might reduce that chance of happening,, but no guarantees! If you do run into a problem like that,, first thing to try might be a different servo. As for the individual components just working,, they pretty much all just work anymore. Alot of the name brand stuff is either re branded Chinese product, or produced by the same over seas company specifically for the name brand.
Another remedy IF you have compatibility issue, would be to use a capacitor on an extra channel on rx. It might be a good idea to make sure there is plenty of current for all the electronics considering the extras you are adding. External bec, for the extra circuits?
I've only had this happen when I was running a lot of boost (dynamic motor timing). The worst one I had was in my xxxcr, I was running a novak kinetic esc/ novak 13.5 ballistic motor/jr rs310/spektrum s6040 servo, with this setup when you start playing with the boost and flooring it the esc will draw too many amps and the spektrum servo(I believe it's a rebranded savox) is a power hog also, so with this setup it would starve the receiver to the point where it would shut down with the servo/esc in its last position aka full throttle, and would stay at full throttle until the power was removed. Needless to say it didn't end well for the xxxcr. Since then I've stopped using jr/spektrum and savox. The only radio gear I'll use is futaba or airtronics as I've had their stuff in the past and it has proved to be extremely reliable. As for the servos I stick with futaba, but I have been wanting to try some ko propo servos as the look pretty interesting also.
As for the esc I haven't had another novak since, but I do still run that novak esc. My current race setup is using a speed passion reventon pro and I like that, however I've had good luck with tekin in the past and wouldn't hesitate for a second to run another, my most favorite brushed esc was the tekin g10 and I ran that for 8+ years
Cool - yeah I read about all that BEC stuff and it sounds like a lot of people run into that and have to install filtering caps and things. That motivated my checking the BEC specs on the Tekin and the Futaba (which I am most accustomed to anyway from the olde days). The Savox brand is new to me but with the nice receiver and ESC it sounds like I should be OK.
Thanks for the guidance guys! The 22SCT kit came today so the kids are super excited. We homeschool so they are sorta my R&D skunkworks team
I'll let you know how everything comes together, especially as we get into the custom hardware. If you guys have any cool ideas for things you'd like to do with smartphone/tablet and your cars, please post them here and I'll integrate as much as I can into the design!
krekeltronics wrote:Cool - yeah I read about all that BEC stuff and it sounds like a lot of people run into that and have to install filtering caps and things. That motivated my checking the BEC specs on the Tekin and the Futaba (which I am most accustomed to anyway from the olde days). The Savox brand is new to me but with the nice receiver and ESC it sounds like I should be OK.
Thanks for the guidance guys! The 22SCT kit came today so the kids are super excited. We homeschool so they are sorta my R&D skunkworks team
I'll let you know how everything comes together, especially as we get into the custom hardware. If you guys have any cool ideas for things you'd like to do with smartphone/tablet and your cars, please post them here and I'll integrate as much as I can into the design!
cheers all,
Patrick
It would be pretty cool to incorporate a camera on it for live feed, or maybe a live map of where the car has driven and where it will be(extra helpful if you loose sight of it)
yeah that is a really neat one! Ours will need to have something unique to set it apart, that is for sure. And even if it doesn't, it will be great fun and a great experience.
The GEN2 Tekin ESC and Savox 1258 will work out fine with your radio. Make sure install the capacitor on the Tekin as directed by the instructions and set the dual rates for steering properly. Savox servos are voltage crunchers for sure, but you should not have any issues. I have been running gen Tekin stuff with both Savox 1258s and 1257s and had no issues.
