YXL Performance Discriminators

[avted]

Yup, I meant the 4038 truggy motor.

 

[avted]

Nice catch folks. I'll check in with Tekin support.

 

[redsawacs]

I understand that you are using the 4038 truggy motor and Gen 2 RX8. Yes that ESC will handle 6s. Im not sure if I need to go into an electronics/physics lesson here but I will basically say this. When you use a high KV motor, there is less torque produced with that motor and more RPM. Torque is required to get a vehicle moving. The heavier that vehicle the more torque is required. If you use a VERY LOW KV motor, say 1000 KV, the motor will have tons of torque and will have a much lower amp draw on the ESC in order to do work (efficiency). When you raise the KV, you're reducing the "efficiency" and requiring the ESC to work harder to provide the power needed to move such a load. The lower the KV the lower your amp draw. When you increase your voltage, you increase your amp requirement on the ESC and you will damage it.

I just got off the phone with Tekin and they also mentioned that the KV of that motor is only designed to perform in the 30-35k RPM range. with 6s, you're in the 44k rpm range (if you ever get it to spin that fast with that much of a load) and it will not hold up long.

Sorry I couldn't give you the electronic breakdown of Voltage, current, amperage and watts but I'm sure at some point, someone will disagree with me and do the math.

 

[avted]

Thanks for all the helpful information, redsawacs! I went back and looked at the Tekin specs, and now see how I misinterpreted them. Tekin support also responded with helpful info, and suggested I drop the spur size and monitor temps or go 4S.

 

[avted]

Thanks for all the helpful information, redsawacs! I went back and looked at the Tekin specs, and now see how I misinterpreted them. Tekin support also responded with helpful info, and suggested I drop the spur size and monitor temps or go 4S.

Sorry meant to say "pinion" not "spur". Long day...

 

[avted]

Finally getting around to posting some pictures of the "Rock Monster" (as my kids have named it). Thanks to everybody for your help on this decision and build. Here's 17.5 lbs of Yeti XL with Tekin 4038 sensored truggy motor, Castle Creations Mamba X ESC, and 6S Lipos:

On The Rocks

 

[avted]

In The Shop

 

[avted]

On The "Estate" Grounds

 

[avted]

Lights & Interior

 

[avted]

Shock Tower Mod

 

[avted]

Helper

 

[avted]

Kit Wheel Mod
http://www.rccrawler.com/forum/axial-yeti-xl/542395-pipe-ring-support-around-wheel-hex-2.html#post5305388