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Kev187

Brushless equivalent for a sport tuned 540

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I just got back into the hobby after yet another t+ year hiatus (on and off for 30 years)

I just built the new re-release Grasshopper (black edition) after finally finishing my sandscorcher from 5 years prior.

The grasshopper came with the TBLE-02 ESC (brush/brushless)

I would like to put a brushless in it, well just because and I have some disposable income. And since its mostly on the shelf it would look cool.

I'm new to brushless. I have a Tamiya BZ motor and a sport tuned black can. I like the performance of these motors in my old kits.

Is there Brushless equivalent of the black can sport tuned? Nothing crazy, but comparable to just a bit faster than the silver can 540?

Thoughts and yes I am determined to do this, so is there a brushless to fit my needs? Some are saying a sensored 17.5 would be similar?????

Thanks everyone :D

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21.5 I say or a 17.5.

The G/H has quite low gearing and all brushless motors rely to be geared pretty tall. Normally around 4 to 6 teeth higher then the same in brushed motors.

This hard in most retro Tamiya's with limited gearing options so I buy lower turn brushless motors to have the rpm's there for the limited gearing.

I have seen a Hornet with a 5.5 and just insane.

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Ok, so the gearing is quite different for brushless? I'm all new to brushless. So basically stick with a brushed unless you can tweak the gearing?

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you can run a brushless motor with stock gearing, you just have to watch for the temp of the motor, make sure it doesn't get to high.

turn rating for a brushless motor is honestly one of the most misleading way for manufacturers to label a motor. it's just a carry over from brushed motors to give people a very rough idea of the speed one could expect from the motor. the kv rating of a motor is the accurate way to work out performance. Kv X volts = rpm.

for what your wanting to do, go for around the 3000 Kv mark, it will give you a really good turn of speed, won't damage the gears, and shouldn't overwork the esc.

one thing to note about the tble-02s, to run brushless, you need to have a sensored motor, and esc placement is then dependent on how long the sensor cable is.

addendum:

If you get a brushless motor and it's getting to hot to touch after a run, your gearing is too tall, with adjustable motor mounts you can reduce pinion gear size and/or increase spur gear size, in set gearing all you can do is get a slower motor, or get a heatsink/heatsink-fan combo to help cool the motor off. brushless motors start to come apart around the 100 degrees Celsius mark

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So brushless motors need taller or shorter gearing. What is the rpm difference between a brushed and bruahless, what one makes power at a higher/lower RPM. From the little I read, the Tamiya kits that do not allow adjustment of the pinion size , its best to stick with a brushed. Right now, the bulk of my kits are vintage Tamiya!

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Generally,lowest gear you can to start with and work up.

Depends where you're running,car park,asphalt,I would say it would be fine on stock gearing.

Grass,would need lower gearing, same as BITD.

Screen grab from the castle creations site,higher rpm motor,lower gears required.

Screenshot_2016-02-08-14-00-36.png

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you can run a brushless motor with stock gearing, you just have to watch for the temp of the motor, make sure it doesn't get to high.

turn rating for a brushless motor is honestly one of the most misleading way for manufacturers to label a motor. it's just a carry over from brushed motors to give people a very rough idea of the speed one could expect from the motor. the kv rating of a motor is the accurate way to work out performance. Kv X volts = rpm.

for what your wanting to do, go for around the 3000 Kv mark, it will give you a really good turn of speed, won't damage the gears, and shouldn't overwork the esc.

one thing to note about the tble-02s, to run brushless, you need to have a sensored motor, and esc placement is then dependent on how long the sensor cable is.

addendum:

If you get a brushless motor and it's getting to hot to touch after a run, your gearing is too tall, with adjustable motor mounts you can reduce pinion gear size and/or increase spur gear size, in set gearing all you can do is get a slower motor, or get a heatsink/heatsink-fan combo to help cool the motor off. brushless motors start to come apart around the 100 degrees Celsius mark

A 3000kV motor running 2S lipo should give ca 21,000rpm max motor speed, so between sport tuned and BZ motors, a 3300kv will get you theoretically to 24,400rpm,

Brushless motors of those sort of kV ratings used to be ca 13.5T a few years ago, but don't take that as a given these days.

I' not sure how much programming is available in the TBLE-02 ESC (I've always ditched mine for somethign else) but on most brushless ESCs you can programme a lot more characteristcs, such as drag brake, motorr timing etc

Grasshopper is nice n light so won't need huge kV to push it along, and likewise the lightness willt ake some of the demand off the motor and keep temperatures down.

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I run a monster hornet, which has big wheels (WR02 pin spikes), stock pinion, 4300kv brushless on 2s (31,820rpm) and motor doesn't break a sweat. You'll be fine gearing wise imho.

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The sensor brushless motors still use a turn rating (17.5T ect.) vs. KV rating, what is the breakdown on that?

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RC%20Brushed-Brushless%20Motor%20Convers

(The above is an approximation based on the assumption of no timing/boost on the ESC end. If you change the timing/boost settings, the picture may be very different.)

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I just look at the rpm as a guide.

So brushed BZ is 26,500rpm at 7.2v. A 3700kv brushless (3.7x7.2v) =26,640rpm.

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I run a monster hornet, which has big wheels (WR02 pin spikes), stock pinion, 4300kv brushless on 2s (31,820rpm) and motor doesn't break a sweat. You'll be fine gearing wise imho.

+1 just put in a 17.5 or 13.5 and use a temp gun at 4 mins, 7 mins and 11 mins.

give the car a break at 11-12 mins for motor longevity.

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