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  RATED:

Power HD 3688HB Digital Servo 25g/2.8kg/.07sec

Power HD 3688HB Digital Servo 25g/2.8kg/.07sec

A precise servo of around park-flyer size. Smaller than a standard servo yet larger than a mini. The 3688HB has a 2.8kg/cm stall torque weight and weighs only 25g.
For those looking for precision servo for their small- to medium sized plane, this would be a smart choice.

Model: HD-3688HB
Voltage: 4.5v~6v
Speed @ 4.8V: .08sec
Speed @ 6V: .07sec
Torque @ 4.8V: 2.3kg/cm
Torque @ 6V: 2.8kg/cm
Weight: 26g
Size: 35.5x28.6x15mm


PRODUCT ID: HD-3688HB

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Weight (g) 26
Torque (kg) 2.8
Speed (Sec/60deg) 0.07
A(mm) 32
B(mm) 35
C(mm) 29
D(mm) 14
E(mm) 48
F(mm) 19
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Customer Data

Weight: 55g Quantity: 
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Price$21.84


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 Customer rated
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Total of 35 discussions.
Randall  1 points - 3/11/2014
 
First off I want to apologize for posting this in error- as you can see It went directly to your comments...this was my first attempt asking for assistance. would you happen to know what the load for this servo is ? 1520us 333hz, 760 us 560hz, 1520us 250 hz ?- I'm contemplating pairing this servo up w/ a Assan ga-250 gyro . I recall reading somewhere that this combination works very well... any help will be appreciated. thank-you.
 WTWUK 2644 points
What heli are you going to use it on? This will work fine with a GA-250 on 250 and 450 helis, but can struggle on 500's. I tend to check out tail servos at 1520/333 for a few minutes of hovering and some circuits and pitch pumps. If on landing servo is cool, 333 will be fine. But, if servo is warm, drop it back to 250hz and try again. This one should however be fine to go at 1520/333 no issues. 760 anything will make it very ill, so don't use those settings.
 Adriaan 2 points
I set mine to 1520us at 250hz and works great on a GA 250
 contact303 142 points
GREAT servo on the GA250 I have same
setting can confirm Adriaan
Works really really well
Bambang  1 points - 2/12/2014
 
for this servo, what kind gyro are using compatible ? I have align gyro gp 780 , is this compatible or not ?
 WTWUK 2644 points
Yes the GP780 will be fine. Set to 1520us and Analog. Do not set to digital or it may burn out the servo.
 Adriaan 2 points
How can you tell this guy to set his gyro to analogue when the servo is a digital servo?
 WTWUK 2644 points
Easy. From experience. Just because a servo is digital, does not automatically mean it can be run with a gyro set to digital. Many gyros when set to digital have such a high framerate output they cause a lot of servos to run very hot. The GP780 being one of them. When I started with helis years back, I fell into the same mindset - digital servo, set gyro to digital. Burnt out five tail servos, one a genuine Fut aba 9257 until I spent some time reading up about it.
 Randall 1 points
WTWUK would you happen to know what the load for this servo is ? 1520us 333hz, 760 us 560hz, 1520us 250 hz ?- I'm contemplating pairing this servo up w/ a Assan ga-250 gyro . I recall reading somewhere that this combination works very well... any help will be appreciated. thank-you.
 Adriaan 2 points
I understand what you saying but my servo works fine on digital setting on a GA 250 so it wont burn servos on all gyro set to digital!
 WTWUK 2644 points
I never said it will burn on all gyros set to digital. The GA-250 has the slower digital settings of 1520/250 and 333. Many other gyros have only 760ns settings - as does the GA-250, but you try running a digital servo that only supports 1520 watch it fry. Probably before the end of it's first flight! All I am saying here is just play it safe. If you dont know the actual specifications of servos and/or gyros, run them slowly - and for gyros that only have digital or analogue switches, that means run in analogue. If you have this very servo, run it at 333 on your GA-250. It likes it!
porte  1 points - 12/3/2013
 
Is it a low profile servo ?
 Anthony 1 points
No it's just a standard mini servo size
Christoph  9 points - 10/22/2013
 
Servo failed after 10 flights as 450 tail servo.. instant crash, servo very hot
 Cacique 1 points
Hi, what kind of gyro are you using? I know this not work fine with 401B is better with GA250 or similar. regards
 Christoph 9 points
It was a KDS800 gyro. Meanwhile i replaced the servo with a cheap chinese HD clone from ebay for 10$ which works perfectly.
 Cacique 1 points
Your gyro is similar to HK401B, is clone of futaba gy401, you need a clone servo of futaba S9257 digital servo for your gyro, test with HK 28012MG
DiegoVieira  6 points - 7/8/2013
 
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Customer Reviews
Overall Rating
WetPants
19 likes
ValueUNRATED
QualityUNRATED
10 thumbs up!
Great quality servo. Cable seem a bit thin though.
I stripped the gears on bad landing. Cant find spare gear parts anywhere. So maybe not so good value if I have to buy new one?


32 comments. Reply..

Overall Rating
Graham helis
352 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
just got mine to day, seems to be worth the wait.
i have all ways had good quailty servos over the years.
this one is Very Good.
i am going to use it in a HK 450, with a 401b
the speed is good centering is consistent,so overall
i am very pleased with the price and quality
as all ways it is five stars


2 comments. Reply..

Overall Rating
Graham helis
352 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
i have now had the chance to fly the servo.
i have got it on a HK450 PRO and A HK401B gyro
it is as good as the turnigy ds480 tail servo, i would go so far to say that it is faster in the heli.
very good quality, so Hk have done it again five stars


9 comments. Reply..

Overall Rating
Maccanaut
47 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
This servo is just as good as the DS520 as far as I can tell. Works beautifully on my Skya 450 Pro and is as fast as anything else I use. Great servo for the money!!


No comments. Reply..

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Overall Rating
Mastaofdisasta
157 likes
ValueUNRATED
QualityUNRATED
Like it?
Das Servo macht aus der Verpackung heraus einen guten Eindruck: Spielfrei, schnell und rueckstellgenau! Werde das Servo im HK-T 500 als Heckservo verbauen.


2 comments. Reply..

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