QuadifyRC 124016 124017 EAT14 cogging issue fix
The WL Toys 124016 and 124017 (and the Eachine EAT14) have a major issue with cogging - the stuttering that occurs when accelerating from standstill or low speed and is a major downside to these recent releases. Cogging in your car is not by bad luck but by design choice; in the search for top speed bragging rights, the tall gearing has really compromised these cars ability to accelerate. Never fear, QuadifyRC to the rescue! I'll give you 3 and a bit options on how to fix this issue by addressing the root cause rather than by going on a wild goose chase and addressing the wrong things.
Cogging - The Root Cause
As soon as I found out WL Toys and Eachine had retained the big 27t pinion from the brushed models I knew they would be fast but were going to be poor on acceleration. This turned out to be correct as you can see on my Eachine EAT14 review which has the same running gear as the 124016 and 124017. You can get away with this big pinion on a brushed motor (like with the 144001, 124018 and 124019) because of the way they work but not on a brushless motor because of the way they differ mechanically. Cogging is when the electromagnetic field invoked by the motor is not strong enough for the motor rotate and catch the next pole thereby getting out of phase and rocking back and forth; it's that jiggle your car make before it takes off. So what causes it? The motor can not generate enough torque for the given load. The 2845 is not a small motor for a car this size so it is safe to assume that it is the load that is unreasonably high due the very tall (fast) gearing.
Since we know the root cause we need to address it directly in order to get the best quality solution but before I do that I'll let you know the things that will NOT fix it:
WL Toys 104009 review
The WL Toys 104009 is a recently released a 4WD RC monster truck. It is made by WL Toys, one of the lower cost RC Car manufacturers that tend to strike a good balance between performance and affordability. This particular car is stated as 1/10 scale but is about the size of a typical 1/12 scale, still big enough to perform off-road. In this review I'll cover what I like about this car and what I don't like so you can make a decision to see if it will suit you or not.
As I mentioned WL Toys have made some very popular cars based around a common 144001 platform which I have written EXTENSIVELY about here: All my WL Toys RC Car review and upgrade guides. This car however is not based on that platform, rather it is and upgraded version of a lesser-known WL toys car, the 12402. Upgrades include oil shocks instead of friction dampeners, metal suspension arms front and rear, a much better looking body heavily inspired <cough> by the traxxas Maxx and XMaxx plus a whole lot of LED lights. Let get straight into the review.
The Sequre SQ-ES126 is a top of the range compact electronic precision screwdriver that has been made for very precise work such as small scale RC Cars and quadcopters. These small screwdrivers can significantly speed up your build and repairs, especially when you have long screws! This in not a cheap tool though so in this review I’ll give you all the details to help you understand if it is the right tool for you.
Before we get stuck in to this review let just define the difference between cordless/impact drivers (like you might use for building/home rennovation) and the precise compact drivers like used here.
HBX 901a Review
The HBX 901a is a new 4WD brushless truck from HBX. Being 1/12 scale, it is larger than the cars they typically make. In this review we will cover off the specs and build of the truck, give you all of the performance results and finish up with a summary and recommendations plus some ideas for improvements. If available I'll post a discount coupon on my coupons and discount page
HBX have made some great releases in the 1/16 scale recently of which I've reviewed both - the 16886 Spectre desert buggy and the 16889a pro monster truck. Both have performed very well - good speed, battery life and perhaps above all else, outstanding durability. It's great to see then that they have stretched themselves and extended this brushless offering to a 1/12 scale car. This larger scale can open up a bit more heavy offroad locations with the larger size - wheels, ground clearance and presence. Before we jump into the specs, you'll see I'll reference the HBX 16889a pro a lot because a lot of the parts have been lifted from this truck. That's no bad thing as you'll find out below...