102 replies to this topic

[spoof05]

Hi I`m interested in the FTX Carnage Brushless(i owned a grasshopper in about 84 ? ) but have just read the guide and it says Lipos are not for newcomers Can I run the brushless Carnage on Nimh and if so what do you recomend batt size to get the best performance and runtime ??? i`m only messing about at the mo not racing but maybe interested in lipos in the future when i get braver.

Also could you recomend a charger so that i can cycle these batts I wanna get about three batts so i can keep going.

Or do you recommend i go for the brushed version?

Many thanks in anticipation.

[Bon Jovi]

_{Thanks dude, just what  a rc hobby begginer like me needed to read.}

[nitro taste bad]

im just wondering why it is illegal to use other 40mhz frequencys, is it to do with wireless products or government equipment or something and if you do use them how would others know and would you be arrested.

Sorry but im just really curious

[Garry]

Its to do with channel allocation and responsible use of the band. 40mhz crystals ending in zero interfer with crystals on either side of it.

If someone uses something outside of permitted channels then when something goes wrong and the investigation turns out that you're using illegal frequencies, then you're looking at prosecution and a heafty prison sentence. There are scanners in use at MOD bases in the UK and they have a large area of operation, but its a massive massive gamble to run anything illegal and not worth it.

There's a lot of information on http://www.ukrcc.org/

[nitro taste bad]

Thank you Garry, now i understand

[jaydubster]

Fantastic guide, cheers all contributors !!
I've been out of the RC scene for over a decade & haven't ran electric for about 20 years. Things have changed A LOT in that time, and this guide's just 'learnt' me loads

[landerson07]

Great guide for us noobs! Glad we now have brushless motors lol!

Sent from my GT-I9100 using Tapatalk

[AlphaZero]

I'm looking at picking up a cheap discharger should I go with the LRP or Prolux, both £10 from Modelsport.


Thanks

[Thunderwolf]

came in here looking for some more detailed info on what series and parallel actualy do, didn't find it.


sincle found that info i was after but may be an idea to add this info to the batteries section of the guide as people seem to be using series and parallel more often these days (lipos in perticular)

[ash12321]

im sorry if i have missed it. but is there anything said regarding sensor/sensorless motors?

[Garry]

That bit needs adding in, I'll do it soo, but basically a brushless motor is a 3 phase motor. To make it turn, 2 of the 3 phases are ''on'' and one isn't, and the armature rotates towards the ''off'' phase. The ESC can do this in two ways.

With a sensored motor, the motor has a hall sensor to know which phases are on or off, and it sends the information to the ESC which then tells the motor the next phase to turn off. This means the motor runs very very smoothly.

With a sensorless motor, the ESC sends a pre-set signal to the motor all the time during running. If the armature position is 'caught' between two phase signals, it causes the armature to electronically 'bounce' off of each signal, casuing the stutter. This can be due to high gearing, a poor power source or the quality of the motor.

Sensored motors are smoother, sensorless motors are faster as they can handle higher voltages. Some systems can start sensored and then turn off the sensor to get higher RPM.

[coolas4k]

Hi, what rate should i discharge my NIMH battery pack please? Is it the same as charging i.e. 1C? Its a 8.4V 3000mah pack that came with my Erevo. Thanks

[Garry]

What discharging device do you have? I never noticed a difference in performance by discharging at higher rates with NiMH batteries, other than the pack discharged quicker. As long as the device cuts off around 0.9v per cell, it doesn't matter about the rate.