HK 450 - ESC and Engine hot hot hot - RC Groups
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Feb 10, 2010, 07:18 PM
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framos's Avatar

HK 450 - ESC and Engine hot hot hot

ESC and Motor too hot and eventually the engine off after a few seconds or not reach the speed to take off.


What is wrong with my settings? When I turn on the helicopter it runs for about 10 seconds and the engine off. The esc is very hot, although several people have recommended.
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Feb 10, 2010, 07:27 PM
Gerktron Remix
planedude91's Avatar
Well, 4000Kv is a little excessive for a 450, especially with a 13t pinion. Try using a 10t or 11t pinion.
Feb 10, 2010, 07:52 PM
Closed Account
Also make sure that you dont have the gear mesh between your pinion and main gear too tight when you change out the pinion. That will rob power and really heat things up. There should be a paper thickness gap between the teeth. I run a 3700Kv motor with an 11 or 12T pinion for sport flying.
Feb 10, 2010, 08:19 PM
LoS sUAS AP/V is not a crime.
W,,,,,,,,,,,,,,,,,,,,'s Avatar
Yea waht Xrayted said plus....
Make sure the belt is not too tight and pull the head off and make sure everything moves without binding.
I had to ream out a few links to smooth my HK450 out.
Feb 10, 2010, 08:25 PM
Registered User
agreed, too high a kv motor to be efficient and really on the low side of wattage for 450, think closer to 250-300watt .. a small pinion probably wont even get it cool .. i would use that motor in a king2/300 size heli with a 9T likely ...
Feb 11, 2010, 01:58 AM
Registered User
Allso--It helps if your throtle curve at half stick is at least 80%. Use a pinion like a 10 or 11 tooth. That lets your moter run closer to its power curve so it runs cooler, keeps the controller running cooler to! the smaller tooth pinion will slow the head speed down. A 4000kv moter with a 13 tooth pinion at 80% power curve is a bit wild hence the 11 tooth to tame it a bit. Hope this helps. PB
Feb 11, 2010, 08:22 PM
Screwed Again My Friend
jombo's Avatar
its your esc ,
if you read the limits you are at the very edge with it, its your esc shutting down because the motor wants more power . you need this one , i have this 40a in mine with this motor and its fine all day long .
Feb 11, 2010, 10:49 PM
Registered User
I've had the same problem with that ESC. Changed to another ESC with a 3 amp BES and cured the problem. I also run the E500 4000kv on a 13 tooth pinion with no over heating after I changed the ESC
Feb 11, 2010, 11:05 PM
Registered User
skunkworks2006's Avatar
This is frustrating for me to read. I have that same motor and ESC waiting to swap out the Turnigy 2830 -3500kv and 30A Plush ESC. I've had fun with my set-up, but I'm ready to up the head speed and power for some mild 3D.
Feb 12, 2010, 02:21 AM
Registered User
I have the same ESC with no issues.
Feb 12, 2010, 08:49 PM
Registered User
framos's Avatar
Thanks for the respose.

Xrayted - About the grip between the engine and main rotor, I afrox a little, to no avail. I changed the ESC by a SS 50-65A, not heated so much, has more faults to start the engine now does not work anything in the engine, only the BEC.

I returned to the H40A TowerPro ESC and motor worked, but even to 60% throttle. Not yet tested by changing the pinion, because there have one of 11 teeth, I'll buy and try.

I think the connections are not well soldered on new ESC (SS 50-65A), I weld it all over again.

Regarding configuration, already researched the forum and found some Class 450 with this engine and ESC of 30A (okay that was a Plush). Most really puts a 3700kv with 11T pinion. Has a video of a guy playing a 3D angry with 4000kv and 13T.

A friend told me to change blades for carbon, I will try too. The original blade has holes (not cast) and some adhesives. I did not cheat the patches, this may create some resistance. I change the blades and see what happens!

My heli does not leave the ground! Bad got hovering for about 5 to 10 seconds! 'm Headquarters!

Any other ideas?

I'll post some pictures and video of the heli for you to see.

Feb 12, 2010, 10:45 PM
Registered User
framos's Avatar
Hi Guys,

Show! It worked!

I changed the blades to the carbon fiber. Heated much less, can you be holding his hand !

Now, what happened to the new ESC? Do burned? Well, it do not matter anymore.

Tomorrow I will test it on the field and return to describe the change actually solved definitively.

I appreciate the cooperation of all.

Feb 13, 2010, 12:43 AM
Registered User
lol, good job. I think.
Feb 13, 2010, 12:54 AM
Registered User
framos's Avatar
I agee Prop Bender, I'll change the pinion to 11T. I think to config throttle to 75% and put gauge pitch to +6 (now is +9) will to tame too, for now I don't change the pinion.


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