Operation "Optima" - Part 2

Operation "Optima" - Part 2 - Parts Description.

Hello fellow RC enthusiasts from around the world. 

Thank you for joining me in part 2. In this section, I will be describing the parts I will be installing into the Kyosho Optima re-release. I have most of the parts to start the installation, however I still need a motor gear pinion and a 2.4Ghz receiver. I will order those parts today and may arrive by the end of the week.

Ok, lets get started.


As you can see in the picture below, I will be installing a GoolRC motor.

As you can see the motor is a brushed 540 size motor with a 13 turn wind. It weighs 113 grams

As you can see from the picture below this motor can be maintained with new brushes and bearings, so it will last a long, long time. As you can see this motor is brand new and unused.

And, I've just remembered, I will need some 16 AWG stranded flex cables.
Order Tuesday, arrived Thursday 27/2/2020. Please see below.

 This cable will then be soldered to the positive and negative terminals of the motor. I always prefer to solder my motors, as the push on type can vibrate loose and cause the buggy to stop. The motor is also tune-able. You can just see the timing marks above. I purchased this motor last year. I imported it from China. It cost $9 including shipping and took two weeks to arrive. It was not supplied with cables or a pinion sprocket. The reason I have not used this motor is simply because I didn't have an esc big enough to handle the extra current (Amps).  Which leads me nicely onto the next item......


As you can see from the picture below, I have chosen wisely.

It is a Hobbywing quicrun 1060 brushed esc. It has a maximum output of 60 Amps. Maximum 540 motor winding  is 12 turn, so I am right on the limit.I can also use a 2S LiPo battery on a 12 turn or higher. I can also use a 3S LiPo but the maximum motors size for this is a 18 turn or higher. What I love about this esc is it's simplicity. There are two jumper pins, one for forward/brake/reverse selector and a battery type selector (NiMh or LiPo). Please see the picture below.

It's not the slimmest of esc's I have seen, but it is very light weighing in at 25 grams. A lot lighter than the Viper in the CAT which weighs 40 grams which has a 27 turn motor limit.

It also boasts of being water proof, low voltage cutoff, overheat protection and throttle signal loss. However this is not a fail safe. The instructions advise that the fail safe is "ACTIVATED" But, the manual does not go on to instruct how to activate the fail safe. In the box, you also get some HobbyWing decals. So I added one of them to my hobby loft clock (see below). I love decals. If you have any spare decal's, please send them to me.


For the steering servo, I will be using an Alturn AAS-750MG high torque servo as shown in the picture below.

The servo has a torque of 12.8kg/cm at 6.0 volts. The speed of the servo is 0.12 second  to 60 degrees also at 6.0 volts.It has 25 tooth metal spline and also metal gearing. It also has dual ball bearing's so it should be tough. It is a three pole motor. It has a weight of 34 grams but the box says 48 grams. It is not 48 grams.

The servo cost me $17 from a local hobby shop and is supplied with a various fitting, fasteners and range of different size and shape horns. It comes in a nice plastic case than can be up-cycled to securely store small spare parts. Or keep it just in case you upgrade it and resell it.


As I have previously mentioned, I need to buy a 2.4Ghz radio receiver. However I already known the model I will be purchasing. It will be a Etronix Pulse 2, three channel receiver that is identical to the one installed in the CAT. this will make binding easier and I wont have to buy a second transmitter. Although I'm sure they will bind to almost  all 2.4Ghz systems, but don't quote me on that, yet.

The picture above doesn't really show how small this thing is. It's tiny and weighs only 2 grams. As you can see it has three receiving channels. It also has a built in failsafe, so If your transmitter loses power for whatever reason, the buggy will simply come to a halt, safe and sound. I think these normally retail for around $10 plus shipping, maybe cheaper. I will update the cost asap.
Cost update 25/2/2020 - the receiver is actually $14 including shipping and so could/should be here by 2/3/2020 at the latest.

Ordered Tuesday, arrived today 27/2/2020. Please see below.

I am so pleased it has a new binding tool. I can't find the one the set came with.


Again, as I have previously mentioned, I wont be buying a new transmitter. I will be using a transmitter I already own. I will simply be binding it to another receiver. However, If  haven't read my CATXLS page, it will be a Etronix Pulse ex2 Pulse 2.4Ghz transmitter. It is of the pistol grip type with a trigger for throttle and a small steering wheel, as shown below.

On top of the transmitter is a small transparent lid and when opened reveals the trimming pots and servo reverse switches. The power switch is also under the same cover. A the bottom is another cover that slides back to reveal the battery box. The transmitter needs eight AA 's to function, therefore with a full magazine of batteries it becomes very heavy, weighing a massive 329 grams. I would not recommend dropping it on your foot. The transmitter and receiver were $35 from a local hobby shop.


I will not be buying a new battery. I will be using a  Voltz 3000 mAh, 7.2 volt, NiMH battery with a standard Tamiya connector as shown below.

Weighing in at a massive 203 grams, it weighs more than all the combined electronic components together and is the heaviest part to add to an already weighty buggy. However I could negate this weight with a smaller, lighter and more powerful LiPo 2S battery. Maybe in the future......near future. Don't get me wrong, this is a great battery and really makes my Schumacher CAT xls dance, even with a 27 turn motor. My only concern is the weight of the Optima combined with a 13 turn motor, will drain the battery in short run times.We shall see.


I said earlier I need to order a pinion for the motor. I think this is something I need to study further and consider the components I am using and try and even it out between power and run times. I'll do my homework on the pinion and choose a couple to order. I will update you with my findings asap.

Small update: I have decided to use the original pinion I took off the Optima in the first place. It belongs to the optima. This will also give me the opportunity to make a direct comparison.

I think I have covered everything on the parts I'll be using. I obviously update the blog if there are changes.

Next time I'll be installing all the parts to the Optima, taking plenty of pictures along the way. Maybe sharing a tip or two.

Thank you for reading.

Take care.