KB28-47-08S 4900kv Brushless Motor

 Cody f86saber 338 points

This will depend entirely on what voltage and what propeller the motor will be turning. What number of cells, prop size and gearbox (or EDF fan) do you plan to use?

 __EMI 59 points

My measurements are about 70 amps 3S

 Michael 10 points

Bei 3S wird der Motor nach 3 min über 130 Grad Celsius heiß und zwar ohne irgendweine Last. Mit 2S habe ichs nich probiert. I tried this one with 3S and it´s getting really hot. More than 130 degree celcius without any fan or somthing else.

 __EMI 59 points

Whit 4 cells you fried it.

 seedo 103 points

yes you can, you can even use 3000mAh

 kobusv 7 points

i know u can use a 3 cel

 jesusvillaa 67 points

Hola Robledo, estoy buscando un motor para el EDF de 65 mm de mi t-45, ¿*que resultado te ha dado este motor? ¿*Cuanto voltaje aguanta y cuanto consume? Gracias.

 ezarc 138 points

Also can anyone tell me how many mm diagonally across from the mounting holes?

 Bekkarim 15 points

put it in the wishlist, you will be notified when it come ! nice day

 ezarc 138 points

I already did, they were back in stock about a week ago.

 Cody f86saber 338 points

Hello ezarc, there are dual sets of mounting holes, 15.5mm and 19mm spacing dead center. Shaft length is 12.7mm and 3.17mm diameter. Hope this was helpful.

 Gr_Al 5 points

Yes. I use this motor on my mini-revo. But Traxxas ESC not reliable, i change ESC too.

 Freezer1980 1 points

Thanks for the answer. Does it work better than the original velineon ? (Speed, Temperature,...) ? I want to use it with 3s - which ratio is ok ?

 Arthur 23 points

Hello, i dont recomend use it on e-revo VXL. have toasted the original velineon ESC using 2s lipo. it pulls to much amps. other thing is to be carrefull with the connectors, they tend to lose with time.

 bugnet 1 points

It rocks on the mini revo just got an turnigy 35A esc and u are fine

 EIFLER 6 points

hello you need 2.5mm screws that all good tooling shop has. but none in HK

 nes 23 points

Yes the diameter of the screw is 2.5mm but i use theese motors in various models and you must make sure that the screw length does not exceed 1/2 an inch or 12.5mm because it begins to rub on the internal part of the motor.

 EIFLER 6 points

if you want to use the turbine blades with 7 engine you have been obliged to meter the 3.17 mm adapter

 Mattias 3 points

Forgot to say it's a Zippy 3S1P 15C...

 David 62 points

Yup, 4900kV is too high for that large of a fan.
Go with a 2836 Outrunner * 3900kV for 3S and 3" EDF.

 David 62 points

Yup, 4900kV is too high for that large of a fan.
Go with a 2836 Outrunner * 3900kV for 3S and 3" EDF.

 estefan 7 points

I have the same motor, and yes, that fan is too much for this Amp-hungry baby. I'll try "High-Speed EDF Ducted Fan Unit 3Blade 2.75inch 70mm" ($8.12, currently out of stock), and HET 6904 - 4 blades (not available in this site). Try also changing the ESC timing setup, I did some tests using a 5*2 prop and got significant differences in amp readings.

 EIFLER 6 points

3 inch turbine with blades 7 is too big to be a motor engine de4300 kv 3900kv'll see better now.

 jlaffin 26 points

The Hobbyking SS Series 60-70A ESC would be safe to use. PRODUCT ID: HK-SS70A

 RixtaRC 8 points

i would say an ezrun 60a or similar would be good for this motor would use it to its full potential

 Brutus315 26 points

In the product description it states the max the motor can take is 50 amp. I always give myself some headroom so 60 amp is the minimum I would use. Turnigy Plush 60 amp is one I own. It has a switching BEC so it can also handle multiple servos. The Hobby King SS series 60-70amp ESC is a good budget servo. You will need to buy a BEC.

 Crampy 184 points

It would really depend on how many cells you want too use and what prop you want to run. That will determine how many peak amps you will be pulling, so choose an ESC form there. You'll need one with a built in BEC, if you only want to use one battery, or buy an external BEC and wire it into the ESC battery leads.

 guitaramp68 40 points

best bet with spare for security,i would go hk 30/40 esc

 Lucien 14 points

this is a good controller with 8 and 16kHz TURNIGY TRUST 70A SBEC Brushless Speed Controller

 Dr.LuckyLuke 317 points

Any brushless ESC with allowed current 80A and WITH BEC (SBEC, UBEC, xBEC, ...) will work. For example Turnigy Plush 80A www.link or hexTronik PRO 80A BESC www.link could work

 Angel RC Design 23 points

I think this motor is good for a 70mm fan system,
on a 3 cell.

 Jeffrey 5 points

Thanks for ALL the input, it is much appreciated!! Now Mattias makes an interesting point here as I was intending to use these motors with their 7 blade EDF 2.5/3.0". Now what to do?? I am looking for a high speed motor for the unique sound it makes in an EDF also power for fast flight. I realise that there are many other expensive options if I was to use "Name Brand" stuff but I have bought a bunch of stuff from HK and overall am very satisfied. I have kit forms, the F14 and F16 and want to power these. What have you used to good effect in these planes? Again thanks for all your help Guys. My direct email is jerryhartwell*yahoo**** P.S. One of these days I will fly my A380! JEFF

 Boggy 7 points

I have hear a Plush 80A and Turnigy 2200 3S 45-90c works well. just check with a watt meter and change your prop / fan accordingly.

 Imprez 15 points

yes you need 80amps esc. 3s 2.2Ah should be ok, but I can't help you with the prop, sorry.

 eduardo santos 21 points

thanks for your help

 Imprez 15 points

you'll propably need an higest powered esc, but if it is water cooled may be ok.

 JaredG 318 points

I just got this combo and almost done getting it ready. will let you know how it goes.

 JaredG 318 points

I just tried it out before sealing up the jet. I had trouble first around with the hobbyking 40A ESC sbec(mystery ice) and it stuttered at first, so I changed it to hard start, and then it jumped to 58 amps just before full throttle and stuttered so I shut it down and put in an Align 60A esc I have. Tried out 2S 5000 40C lipo and it ran smooth right up to full throttle, screaming! So I then tried a 3s 3600 35c and it was smooth up to about 3/4 throttle where it stuttered and was very loud so I shut it down. 2s 5000 lipo, static test- full throttle 50.8Ap 389.7Wp 7.67V min 37585RPM 3s 3600 , static - throttle – motor stutters at various points in throttle: 46Ap 513.8Wp 11.1Vmin RPM: 53900 I am going to use the 2s lipos until fan and motor are broke-in and tested in flight, and will try 3s after! Should be OK if kept around 50A.

 kobuscl 6 points

motor will get hot and burn out

 T3rry 307 points

should work fine, but you will have to gear down a bit since the stock motor is only 3800-4000kv (i have heard conflicting numbers on it)

 Jacob 12 points

I know a few people that have and it seems to be fine. I've just bought one for my Mini Revo too.

 cch1978 6 points

Its stupid FAST in the mini revo!!!!!!

 drdiscus 143 points

yes, but probably stay on 3 cells, not 4,

 Maria 22 points

ottimo motore

 Maria 22 points

ottimo motore

 bigsteve 231 points

How many battery cells do you want to run ? this dictates size of prop to stay under 50 amps.