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Item found in the following categories;
> Speed Controllers > All Speed Controllers
> Speed Controllers > TURNIGY

PRODUCT ID: KF-40A
RATED:
TURNIGY K-Force 40A Brushless ESC
TURNIGY K-Force 40A Brushless ESC


The Turnigy K-Force series are based on an all new powerful microprocessor usually reserved for high speed car ESCs. The new CPU means ultra fast sync timing, crisper throttle response, less battery load and reduced FET heat buildup.
 
Specification:
Output:  Continuous 40A, burst 57A up to 10 seconds.
Input Voltage:  2-6 cells lithium battery or 5-18 cells NIMH battery.  
BEC:  Twin voltage selection, 5.25v and 6v.
Control Signal Transmission: Optically coupled system.
Max Speed;    
   2 Pole: 210,000rpm
   6 Pole: 70,000rpm
   12 Pole: 35,000rpm
Size:  59mm (L) * 27mm (W) * 12mm (H).
Weight:  38g.
 
Features:
*High performance microprocessor (24khz) brings out the best compatibility with all kinds of motors and the highest driving efficiency.
*Wide-open heatsink design to get the best heat dissipation effect.
*Improved Normal, Soft, Very-Soft start modes, compatible with aircraft and helicopter.
*Smooth, linear, quick and precise throttle response.
*Throttle signal transfered through optically coupled system to avoid the electromagnetic interference.
*Multiple protection features: Low-voltage cut-off protection / Over-heat protection / Throttle signal loss protection
*Governor mode for helicopter. 
*The firmware of the ESC can be updated through the USB adapter.
*User programmable via Tx, Programming card or pc USB port. .
 
 
 
*Not compatible with non K-Force esc programming card.
 



 

73g -14 $31.49
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Estimated factory delivery date;
Stock updated frequently.
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Goods arriving every 14 to 21 days.
 

Related products
Turnigy Speed Controller Programming Card
$7.79

 Customer rated 4 crowns   
View all comments | (22 threads) Ask a question
seanmjohnston (0 points) 15/12/2009
I'm a beginner so go easy on me. How do I connect this ESC to USB? I can't see a single port anywhere. Also do I have to download some sort of program to actually program the ESC?
xray mike (19 points) 16/07/2009
I've seen YouTube videos of the HobbyWing version appearing to govern (better than my K-Force) so I think it must be possible.

If anyone here is happy with the governor could you pass along your other settings and the heli details?

Also, apart from the nameplate in the photo, the entire thing is wrapped in heat shrink. Is the name plate supposed to be the heat sink? In trying to peek into the ends of the shrink, I noticed that there appears to be an upside-down heat sink installed on the back side of the package, and it's also under heat shrink.... Very strange if you ask me.
Brent (18 points) 15/07/2009
Guys - just want to let you know that this ESC has a compatibility issue with my Scorpion 3008-32 outrunner. I've fried two of them while still in programming mode - seems like the moment that I change the timing, the ESC immediately burns out. It's happened to two in a row now, but other people have found them to be really fantastic, so I can only think it's a compatibility problem. If you have a Scorpion outrunner, rather go for the Turnigy Plush. They work fine with my Scorpions.
  Reply:  ChilternFlyer (13 points);
Brent - I've just got my first pair of force 40 ESC's. I'm only using 3s and an AXI 2820/10. All worked fine until I programmed the ESC. I set the brake 'on' (folding prop) and adjusted the low voltage cut out to 'hard'. Everything was fine until I saved the settings. The ESC acknowledged that it was exiting the programming mode. Then it made some other strange noises. At this point the motor looked like it was about to start and then the ESC went up in smoke!!

My spin on this is that when it came out of programming mode it had the brake on at the same time as the motor.

Having read what you've said I'm wondering if it just crashes and fries itself when it exits programming mode??

I've got another one but I'm not going to risk programming it. The stuffed one will have to go back to HC - NOT HAPPY.

Pity.. I though these would be good 6S ESC's.
I'll stick to my old CC45's. i've had them for years and they have never let me down (Unlike the Turnigy /hobbywing)

Mitch.
  Reply:  ChilternFlyer (13 points);
UPDATE: I'm sending my first one back but I thought I should try the second ESC.. I programmed the second ESC the same as the first BUT I exited the programming mode at step 3 and this time it didn't go up in smoke! (On the first ESC I waited until it had clocked through all of the features and quit from the 'exit programming mode' option).

CONCLUSION: Exit programming mode from the last feature that you programme. DON'T use the 'exit programming mode' shown in option in step 2. The ESC will crash and self destruct!

  Reply:  Brent (18 points);
Hey Mitch.

That's exactly the same thing that happened to me. As soon as I exited programming mode, the motor made a really weird noise and then ***f, magic smoke everywhere.

Second time round, I plugged a low capacity 2s lipo into the ESC during programming. Figured the battery wouldn't have enough power to fry the ESC if something went wrong again. All worked fine and I got it set up perfectly, but changed the timing at the field on a charged 3s and it fried on the spot. And I was only changing one feature, then exiting straight away.

My advice to anyone who reads this would be use a weak 2s battery for programming - at least until the programming cards arrive. You'll save yourself the hassle of a warranty claim.

Brent.
boby (1 points) 4/07/2009
is this esc sam with hobbywing platinum 40A? if any diff state below pls.. thankz
  Reply:  holsen (17 points);
I need someone to confirm that the governor function is working well, and that it indeed holds a constant head speed from start to finish and doesn't drop with battery voltage drop like cheaper ESCs can do.
An Eagle Tree plot with pitch pumps and detailed info on setup would be nice for a reference.
  Reply:  xray mike (19 points);
I can't get the governor to govern my Blade 400. Using a flat throttle curve, with any value from 65% to 85%, the head is spinning like crazy at zero pitch but bogs quite a bit if I feed in any collective input (positive or negative).

The very soft start works nicely, I programmed it with the throttle stick, but I'm wondering if the timing advance could be at fault with the governor.
myhhhbg (35 points) 29/06/2009
if its Opto, why i see 3 wires in the BEC Cable ?
  Reply:  xray mike (19 points);
Good question! The manual mentions a 150A version with an OPTO and no BEC. There is no indication that this unit has any isolation.
aziego (9 points) 9/06/2009
The Exceed RC momentum ESCs are the same and only a few bucks more and you save on shipping.
parkpilot (102 points) 9/06/2009
***********rcgroups****/forums/showthread.php?t=1060855&highlight=TURNIGY+K+Force

***********rcgroups****/forums/showthread.php?

t=1060855&highlight=TURNIGY+K+Force

rcgroups****/forums/showthread.php?t=1060855&highlight=TURNIGY+K+Force
  Reply:  parkpilot (102 points);
Just add www and com
A good reveiw on these Speed Controllers
RobinL (0 points) 7/06/2009
"...based on an all new powerful microprocessor usually reserved for high speed car ESCs."

Q.: Does this mean it can be used as a car ESC?!
Janosax (6 points) 31/05/2009
Yes, when will be these esc available again, I wait since along time now, and don't want to buy a HW platinum.
And do you plan to sell 2in1 HW box rebaged to Turnigy?
xray mike (19 points) 25/05/2009
These look nice - will they be reordered and stocked again?
keyman (243 points) 21/05/2009
kewl the programming box is in
***********hobbycity****/hobbycity/store/uh_viewitem.asp?idproduct=8996
parkpilot (102 points) 12/05/2009
Turnigy Speed Controller Programming Card
***********hobbycity****/hobbycity/store/uh_viewItem.asp?idProduct=7187
This Turnigy Programming card is compatible with the following TURNIGY esc*
Plush
Sentry
Marine
K-Force
Basic
Sentilon
EZ-RUN v1 & v2
Kenneth (3 points) 2/05/2009
What size are the pre-soldered bullet connectors (I might need to order some matching ones for my motor) ?
  Reply:  Aero-Nuts (5 points);
Just got the Hobbywing branded version...3.5mm bullets come on it.
fabio2638 (7 points) 28/04/2009
Can someone tell me the best timing for "Turnigy E500 6T 4000Kv 200W Heli Motor" ?
Thank you
night_flight (86 points) 10/04/2009
When will the USB programming interface be available?
keyman (243 points) 9/04/2009
Seems like some are confused by the following quote and think this is a car esc, It is a airplane /heli esc.


"The Turnigy K-Force series are based on an all new powerful microprocessor usually reserved for high speed car ESCs"
Jony (52 points) 6/04/2009
Is it also possible to set the options by tx or JUST with this programming card (or box)?
  Reply:  Merlon (18 points);
The manual for the equivalent Hobbywing Platinum states full programminginstructions for TX programming. The only option that seems to require a programmingbox is setting your own custom cut-off voltage.

The manual can be found at the website "Blue Angel" linked earlier:
***********hobbywing****/upload/manual/HW-01-PL.pdf
keyman (243 points) 6/04/2009
***********hobbywing****/english/ArticleShow.asp?ArticleID=435

***********hobbywing****/english/ArticleShow.asp?ArticleID=446
keyman (243 points) 5/04/2009
Looks like we get 2 choices from hobbywing on a programmer, I like the new heat sink
  Reply:  Jason5001 (1123 points);
2 Choices?
As they are the same item, I fail to understand your statement.
demonGti (75 points) 4/04/2009
HK Admin, Please post info on the programming card, what card do we use? When will you get them in stock? How much will they be listed at?
Thanks
  Reply:  express315 (727 points);
This is exactly the same thing as HW Platinum.
When connected to PC with HW link software it is
recognised as a HW device. Governor mode works
very well - for 6-8 pole outrunner select Gov Hi and flat throttle at 80-85%. Keep v1.03 firmware
if you still have it, because in v1.05 PWM is limited to 12 khz only. I would rather keep the 24 khz capability.
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