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-   -   Official Tekin RX8 GEN2 ESC Thread (https://www.rctech.net/forum/radio-electronics/726576-official-tekin-rx8-gen2-esc-thread.html)

fast-ho-cars 03-31-2016 12:58 PM


Originally Posted by yzracer758 (Post 14463815)
A few things need to be done on your setup.

1. That Pigtail of wire needs to go bye bye. You want to have some slack in the wire length for chassis flex and normal movement, but not an extra large amount of wire that has to be curled up, especially if its just one wire and the rest are short. Having wires that are not similar in length creates an unbalanced load of resistance on the phases.

2. As mentioned in my earlier post, the 10 gauge wire is hard to solder properly and has no advantage over 12 gauge. Pictured is an example of how your soldering points need to be on both esc and motor with 12 gauge. A poor soldering job, can cause permanent damage to a unit..

multistrand wire actually passes more current and voltage for RC cars. 1/24 slotcar road course racers and drag racers (even when no movement is needed) use it for the same reason. more strands the better, the more surface area you gain over a solid conductor the same gauge

https://en.wikipedia.org/wiki/Skin_effect

there is another law that many do not take into consideration, sure ESC designers do, but there is a point were the gauge wire used becomes too large for the available power source resulting in conductivity losses. called called MHO's law also referred to Siemens. i once saw a racer wire up a car with speaker monster wire.

the next big thing RC cars still hasn't occured, is the use on "litz" wire for stators or armatures of years passed. not sure they ever will, in other hobbies it is permanently banned.

litz wire is multistrand arm/stator wire...from wiki

"The wire is designed to reduce the skin effect and proximity effect losses in conductors used at frequencies up to about 1 MHz.[1] It consists of many thin wire strands, individually insulated and twisted or woven together, following one of several carefully prescribed patterns[2] often involving several levels (groups of twisted wires are twisted together, etc.). This winding pattern equalizes the proportion of the overall length over which each strand is at the outside of the conductor. "

jmcelroy42 03-31-2016 01:26 PM


Originally Posted by fast-ho-cars (Post 14471681)
got my tekin hotwire unit yesterday, all i can say...I WAS WAY THE HELL OFF when it came to attempting manually program it. one example i thought i was in DB setting 2 after programming from the 4-5 fact setting, i was in 6. which explains the severe nose dive on jumps when i let off the throttle. 4-5 was too high to begin with, i made it worse.

highly recommend not skimping on getting one and the small cable

anyone know where one can get a phone to phone cable?

TKW has a phone input, i want to use my phone when i'm at the track to make changes, and not have to pack a laptop

I'm assumimg your phone has a micro usb port....

http://www.amazon.com/Lindy-0-5m-USB...indy+otg+cable

qstorm777 03-31-2016 03:22 PM


Originally Posted by jmcelroy42 (Post 14471521)
Just make a small loop in the wire (see pic). Also you want to make sure the wires have some room to flex so you aren't stressing the solder joints.

Thanks. Curious as to why that way vs the other way?

jmcelroy42 03-31-2016 03:58 PM


Originally Posted by qstorm777 (Post 14471955)
Thanks. Curious as to why that way vs the other way?

I think in case there is something pulling on the wires it doesn't pull the tabs away from the sensor board, and its probably a tiny bit stronger the other way.

ta_man 03-31-2016 07:15 PM


Originally Posted by fast-ho-cars (Post 14471740)
multistrand wire actually passes more current and voltage for RC cars. 1/24 slotcar road course racers and drag racers (even when no movement is needed) use it for the same reason. more strands the better, the more surface area you gain over a solid conductor the same gauge

https://en.wikipedia.org/wiki/Skin_effect

there is another law that many do not take into consideration, sure ESC designers do, but there is a point were the gauge wire used becomes too large for the available power source resulting in conductivity losses. called called MHO's law also referred to Siemens. i once saw a racer wire up a car with speaker monster wire.

the next big thing RC cars still hasn't occured, is the use on "litz" wire for stators or armatures of years passed. not sure they ever will, in other hobbies it is permanently banned.

litz wire is multistrand arm/stator wire...from wiki

"The wire is designed to reduce the skin effect and proximity effect losses in conductors used at frequencies up to about 1 MHz.[1] It consists of many thin wire strands, individually insulated and twisted or woven together, following one of several carefully prescribed patterns[2] often involving several levels (groups of twisted wires are twisted together, etc.). This winding pattern equalizes the proportion of the overall length over which each strand is at the outside of the conductor. "

Did you read this part in the in the Wikipedia article on Litz wire (second sentence in 5th paragraph under "Skin effect"):

"The strands must be insulated from each other—otherwise all the wires in the bundle would short together, behave like a single large wire, and still have skin effect problems."

Seems to say there is no benefit (toward reducing skin effect) of the miltistranding in the wire we use for RCs because the strands aren't insulated from one another.

Then again, we are not operating at the kind of frequencies where the skin effect is real significant (4 pole RC motor at 40K RPM is only 8,000 Hz).

Malazan 03-31-2016 09:34 PM

Could someone please answer a question, on the RX8 Gen 2, when you choose you LV cutoff, you can choose a specific number, i.e. 3.4v for a 3s pack

Is this number per cell or pack voltage, like should it be 10.2v instead of 3.4v for my 3s pack?

I have it a 3.4v right now, but LOL I definitely don't want to take my whole pack to 3.4v

Motorman007 04-01-2016 04:03 AM

Anyone tried the data logging on their phone with update 254?

I can't be the only one not able to see the data..
Thank you

Randy_Pike 04-01-2016 08:53 AM


Originally Posted by Malazan (Post 14472356)
Could someone please answer a question, on the RX8 Gen 2, when you choose you LV cutoff, you can choose a specific number, i.e. 3.4v for a 3s pack

Is this number per cell or pack voltage, like should it be 10.2v instead of 3.4v for my 3s pack?

I have it a 3.4v right now, but LOL I definitely don't want to take my whole pack to 3.4v

What software are you on? It's been total voltage for quite some time.

fast-ho-cars 04-01-2016 12:11 PM


Originally Posted by jmcelroy42 (Post 14471782)
I'm assumimg your phone has a micro usb port....

http://www.amazon.com/Lindy-0-5m-USB...indy+otg+cable

thanks

fast-ho-cars 04-01-2016 12:49 PM


Originally Posted by ta_man (Post 14472223)
Did you read this part in the in the Wikipedia article on Litz wire (second sentence in 5th paragraph under "Skin effect"):

"The strands must be insulated from each other—otherwise all the wires in the bundle would short together, behave like a single large wire, and still have skin effect problems."

Seems to say there is no benefit (toward reducing skin effect) of the miltistranding in the wire we use for RCs because the strands aren't insulated from one another.

Then again, we are not operating at the kind of frequencies where the skin effect is real significant (4 pole RC motor at 40K RPM is only 8,000 Hz).

1/24 slot cars, ones that run on the huge wood tracks (not homesets/plastic) have 2-30+ magnet 2-pole brushed DC motors in wing car classes range from $70-500+ depending on class. majority of tracks are run around 14.# avg volts usually off batteries/power supplies. frequencies...non issue

Litz equivalent wire vs equal solid gauge armature wire was tested. litz ran faster, cooler, and armature arm-meter measurements were better than solid gauge. using it would have caused a cost jump in arms/motors, and mass outdate current equipment used. teching would have also been a issue. so it was perma banned and vote blocked....forever

Malazan 04-01-2016 05:55 PM


Originally Posted by Randy_Pike (Post 14472788)
What software are you on? It's been total voltage for quite some time.

I just updated to the 254 version, got to be per cell now

Because it only allows you to go as high as 4v

cHAmpa 04-02-2016 10:27 PM


Originally Posted by Motorman007 (Post 14472536)
Anyone tried the data logging on their phone with update 254?

I can't be the only one not able to see the data..
Thank you

I was able to do it today, 254 on Samsung Galaxy S6

Motorman007 04-03-2016 05:28 AM


Originally Posted by cHAmpa (Post 14474683)
I was able to do it today, 254 on Samsung Galaxy S6

Really. I have the note 3
It works with both my tekin RSX.
Then i don't know what to say. Thank you for your time.

I also tried 3 other phones still the same thing zero data.

Akrider174 04-03-2016 09:44 AM

2s power?
 
How will the rx8 gen 2 paired with the pro 4 hd 4300 do on 2s 5000 40c will a 2S be enough to power this set up in a sct that weighs only 5.8 lbs?

cHAmpa 04-03-2016 10:54 AM


Originally Posted by Motorman007 (Post 14474860)
Really. I have the note 3
It works with both my tekin RSX.
Then i don't know what to say. Thank you for your time.

I also tried 3 other phones still the same thing zero data.

Also, I'm on Android 5.1.1 if that helps any.


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