LRP Vector x12 Brushless Motors

[radwerx]

Hi. I am using an X12 5 turn currently. I would like to know what is the rough kV of the motor at the factory recommended timing setting of -10 degrees given that at 0 degrees its rated for 7100rpm/V.

Thanks.

[DaveG28]

Guys,

does anyone know the diameter of the rotors on the x12?

I ask as Tamiya are bringing out 12mm rotor versions of their x12 (the current one's part 42125 etc are x12 aren't they?) but I can't find anywhere what the older motors had in, and therefore the difference in performance etc!?

I assume whatever a standard x12 is would also be the old Tamiya diameter!

[burito]

@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

@DaveG28: standard in all X12 motors is 12.5mm rotor, Tamiya specially requested a 12.0mm rotor in their new motors but ourselves we stick to 12.5mm as we feel this is the best allrounder!
We do offer optional rotors in 12.0mm and 13.0mm too, you found all part numbers at www.lrp.cc

[DaveG28]

Originally Posted by burito

@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

@DaveG28: standard in all X12 motors is 12.5mm rotor, Tamiya specially requested a 12.0mm rotor in their new motors but ourselves we stick to 12.5mm as we feel this is the best allrounder!
We do offer optional rotors in 12.0mm and 13.0mm too, you found all part numbers at www.lrp.cc

Thanks for the answer, I assume the earlier motor is an X12 12.5mm rotor (thinking part 42125?)? Am I right in thinking the 12mm will also be less efficient and run hotter?

Dave

[burito]

@DaveG28: actually these questions you should ask Tamiya as it's their motor...

Generally speaking, a smaller rotor improves driveability (smoother) and gives more topend but the downside is slighly lower efficiency and less torque. Temperature isn't much different.

[radwerx]

Originally Posted by burito

@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

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Thanks burito. So am I right to say that I will not gain much top end speed with mechanical timing advance?

Will you recommend simply gearing higher (lower FDR) to gain top end speed then? 'Cos I am running an FDR of 7.0 currently on a relatively large track and the car still doesn't fast enough on the straights. Given the history of the X-12 i am worried about gearing any higher.