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Newbie looking for help with motor/servo selection


Old 05-09-2019, 05:19 PM
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Default Newbie looking for help with motor/servo selection


I am likely going to purchase the following chassis;
(JLB Racing Cheetah 21101 1/10 scale)

I am purchasing a chassis insted of a finished car because I will be adding a lot of custom features. I intend to create my own transmitter that will allow me to control the car remotely, from a laptop, as well as a custom battery using 2170 3.6v cells (~12000mAh) and a boost transformer to get 11.1V. I am a programmer, not an electrical engineer, so I would greatly appreciate some guidance in picking things like servos and motors, since I am so out of my element here. If you visit the website selling the chassis in the link above, they recommend some parts, however I believe the community here will offer better suggestions.

The power system recommended is a 3670 sensorless brushless motor and 120A ESC, 2650 KV
(I am sorry if this is confusing to any experts reading this, I am not quite sure what any of that means.)

As for the servo, I think this is mostly for steering? Therefore it does not matter nearly as much as the motor, and I would be open to pretty much anything cheap yet effective. I likely won't be too rough with it, i can't see myself needing a waterproof motor in fact, so if there is money to be saved, i am all ears.

I appreciate any and all suggestions
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Old 05-12-2019, 05:19 AM
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Welcome to RCU.

I'd be buying something like a GoolRC 3670, or simular blue/red smooth canned motor for $25. If the Cheetah was going to be my only RC, I'd want a reliable ESC...something like a Hobbywing EZRun Max10 SCT, or EZRun WP-SC8 speed control that is rated for 120 amps would be a great choice. Buying a super low budget ESC is very "hit or miss" on quality IMO. I'm not sure on the Kv you would want, but a 2650Kv, combined with a 3S LiPo, sounds about right. I know I wouldn't need more motor than a 2650Kv running off a 3S pack. That's currently what I'm running in my 1/8 scale buggy. YMMV on the Cheetah.

There are tons of choices when it comes to servos at various price points. For a RC platform with larger tires to turn, you will want a good strong servo with metal gears. I would recommend a servo with at least 200 oz-in (15 kg-cm) of torque. A moderately priced Power HD WP-23KG should be plenty of muscle with titanium and steel gears (not like some metal gear servos that use aluminum/brass). I only mentioned that Power HD servo because it has replacement gears available for it, should you need them.

Good luck.

Some good JLB Cheetah threads on RC Groups...https://www.rcgroups.com/off-road-cars-48/
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