I run 16t also, temps are good, runtime is good, plenty of speed

even at 17T the hottest it got was 160. i would keep it there until the ambients start to creep up.

base your motor buying on watts not mainly off KV even more so when buying a spec class motor 13.5, 17.5 etc

The R45 is plenty and would serve you better for both tracks. If it was me, I would go R45...just makes more sense if used on 2 different tracks. Gear down indoors, say 14-15t and 16t out.

Thanks. What kind of average runtime can I expect on a 5000 mah 2s?

Now that's going to depend on how you drive...
I make 10min mains easily on 5000mah.

what's a good starting point for gearing for SCTE with R51?

Looking forward to trying it out.

Check your local rules first. Both the VX4R.45 and VX4R.51 are 550 series motors, but of a 4-pole design. ROAR does not allow 4-Pole 550 Motors in the 4wd SCT class, but allot of the places in the country allow it. It just would not be legal at a ROAR event.

The VX4.39 is a 540 4-Pole motor that would legal for racing though.

As far as a comparison the R.51 would be a little bit more power, and the R.45 would be about the same, and similar driving characteristics. The Copperhead/VX4 systems are sensor-less, but allot of R&D has been done to make the systems as smooth and drivable as a un-sensored system could be. During testing, drivers reported that the systems were just as smooth as sensored systems.

Congrats to ending the wait and making (some) Copperheads are available! Would you give a it more detail on the motors? I am most interested in magnet size and winding of the different versions. Also will a 5mm shaft version or optional rotor be made for the 540 size version?

Just converted an 810 to electric and looking at motors/esc's. I have a MMP and 3800 sitting here. Not sure if I should try running that or get a new Copperhead system.

I am trying to keep this as light as possible and would like to run on 2s, maybe 3s, but trying to stay with 2s. I don't plan to race it, just run it on 2 tracks. Both are outdoor, one is pretty small, the other is a medium/large size track.

I know this is the Viper thread, just thought I would ask for some opinions.

If you do decide to go Viper talk with Rex Welch. He is a dealer and will get you a good price on the setup. I don't know much about the copper head units so I will let others do that part.

Does anyone know how long the stock sensor wire is in the 1/10 combos?

It is 200mm i believe

The reason why so many of you waited long for the Copperhead to be released, much testing and R&D has been done to make this the fastest smoothest high quality system on the market with amazing affordability. You wont be dissapointed after trying this system.

Also ROAR rules will not apply to this system becaust it is not a pro race system although it will perform just as well as other systems. Our aim was to provide a budget system that you can race at club/race level.

If you have any questions please let me know.